help-development

[grim ice]

to know what something is

[lavish hemlock]

A lot

[waxen plinth]

Not all

[grim ice]

o

[lavish hemlock]

Not all but a lot yeah

[waxen plinth]

You can write a parser that doesn't use bnf

Bnf is just a way to can make it simpler

[grim ice]

ic

[lavish hemlock]

It's typically used as a regex-like format that parser generators read to generate code that does the same thing

[grim ice]

nah this aint simple ._.

[waxen plinth]

What, the bnf?

[grim ice]

yes

[lavish hemlock]

You just have to learn it

[waxen plinth]

It is though

[grim ice]

how is this simple at all

[waxen plinth]

​integer ::= [0-9]+

[lavish hemlock]

If it weren't simple, Groovy wouldn't use ANTLR, which uses an extended form of BNF.

[waxen plinth]

"an integer is a series of digits"

​decimal ::= [0-9]+ "." [0-9]+

[lavish hemlock]

Any digit between 0 and 9, and there must be one or more of it.

[waxen plinth]

"a decimal is a series of digits, then a dot, then another series of digits"

[lavish hemlock]

That's what that represents.

[waxen plinth]

Yes

​boolean ::= "true" | "false"

[lavish hemlock]

Then this is just two integers separated by a .

[lavish hemlock]

This is self-explanatory.

[waxen plinth]

"a boolean is either the literal word true or the literal word false"

[grim ice]

list ::= "[" sep (object ("," sep object))? sep "]"
map ::= "{" sep (mapEntry ("," sep mapEntry))? sep "}"
mapEntry ::= string sep ":" sep object

what the is this

[waxen plinth]

Start with list

[lavish hemlock]

I imagine if there were no sep then it would be easier to read

[waxen plinth]

Yes get rid of sep for now

​list ::= "[" (object ("," object)*)? "]"

Sep just matches whitespace

Now you have a list

It starts with [

It optionally has an object in it

Where an object can be any value

[grim ice]

and the object can have another object

[waxen plinth]

That object is followed by a comma and another object repeated between 0 and infinity times

[grim ice]

o

[waxen plinth]

So it can be []

Or [1]

Or [1,2,3]

If you put the seps back in it just allows you to have whitespace between those tokens

So it can be [1, 2, 3] or [ 1 , 2,3 ]

Make sense?

[vale ember]

how can i disable natural mob spawn in specific area but be able to spawn mobs there from code?

[grim ice]

yes

[lavish hemlock]

So yeah BNF is really easy to understand you just need to understand the syntax and break it down like any language.

[grim ice]

i guess its simpler than what it looks like

[waxen plinth]

Yeah it's really powerful

Too bad I haven't had a good use for it

I'll use it next time I make a custom format I guess

[grim ice]

i should learn json

[waxen plinth]

It's easy as hell

[lavish hemlock]

Typically people write grammars (language descriptions) in BNF before actually writing their parser

[waxen plinth]

You can learn json in a few minutes

[lavish hemlock]

It's like an outline of what to do

[grim ice]

o

[waxen plinth]

Yeah

I have a library that creates a lexer out of a bnf file

[lavish hemlock]

BNF essentially becomes the bridge between machine and human understanding of language.

[waxen plinth]

That spits out a token tree you can then parse much more easily than a raw string

[lavish hemlock]

Oh that's p'cool

[waxen plinth]

https://github.com/Redempt/RedLex if you're interested

[grim ice]

thats cool

[waxen plinth]

RedLex-JSON is basically just a demo of how to use it

But there's no real reason to use that as an actual JSON parser

[sacred mountain]

how do i apply knockback to a player

using a vector or sum

[grim ice]

Making a parser for json is probably way too good for me atm, or am I overestimating it

[hybrid spoke]

velocity

[waxen plinth]

Because it's ~5x slower than my regular json parser

[waxen plinth]

It's not all that bad but you should be at least intermediate with Java

[hybrid spoke]

everytime i see @waxen plinth in this channel he is selfadvertising for his libs

[sacred mountain]

idk how to set a vector that will throw players depending on their location from an explosion

[waxen plinth]

You can start with simpler parsers

[waxen plinth]

❤️

[grim ice]

ic

[hybrid spoke]

get the location of the explosion, get the direction, invert it, set velocity

[sacred mountain]

i can do

double distance = e.getEntity().getLocation().distanceSquared(le.getLocation));

thats the distance but thats all ive done

[waxen plinth]

That won't help

Get the vector from the explosion to the player

[sacred mountain]

i just thought maybe if theyre closer

itll do more knockback

[hybrid spoke]

then get the vector of the explosion in relation to the players

[waxen plinth]

player.getLocation().subtract(tnt.getLocation()).toVector()

That gives you the vector from the tnt to the player

[lavish hemlock]

Writing an HTTP server is also a pretty good exercise imo

[waxen plinth]

Then you can normalize it and add it to the player's velocity

[sacred mountain]

then i should invert it and add some velocity to the player?

[grim ice]

o

[sacred mountain]

oh ok

[waxen plinth]

No need to invert

That would make it pull them in

[waxen plinth]

That's pretty broad though

[sacred mountain]

that would be a cool idea for a black hole thing lol

[lavish hemlock]

I mean you don't need to make a full server

[waxen plinth]

No I mean an http server can be just about anything

[lavish hemlock]

Ah well

A webserver then

[waxen plinth]

That's arguably more broad

[lavish hemlock]

A server that displays a page when you visit it in a browser

[waxen plinth]

Yeah but what

[lavish hemlock]

What page?

[waxen plinth]

A file server could be a good project

[lavish hemlock]

Literally fucking anything :p

[waxen plinth]

A chat room

Yeah that's a bit like saying "writing a program is a good project" lol

"try making a plugin"

[grim ice]

I REALLY want to make smth like that

[waxen plinth]

Though for anyone trying to write an http server and wanting to make it use https

[grim ice]

But I don't have that much of a clue

of how to do that

[lavish hemlock]

Not hard, just need a bit of socket magic

[waxen plinth]

It's a huge fucking pain to do with java

But easy to do with certbot and caddy

[grim ice]

Which I do not know how to perform

[waxen plinth]

🧠

[lavish hemlock]

The java.net API, while a bit dated, is still very good.

[waxen plinth]

Huh

Just use HttpServer

[lavish hemlock]

Netty is also a decent choice?

What's the fun in that though?

[waxen plinth]

If it's gonna be a web server anyways

I guess

[lavish hemlock]

The entire idea is to code the requests yourself

[sacred mountain]

ok so this

[waxen plinth]

I mean

[lavish hemlock]

I did this a while ago: https://github.com/MaowImpl/maowhttp

[waxen plinth]

I guess that could work

I think normalize mutates?

So yeah

[sacred mountain]

wdym

[grim ice]

so uh

[waxen plinth]

But you might wanna add instead of setting

[grim ice]

it accepts input

then writes it in the website

[sacred mountain]

i dont think there is an addvelocity

maybe im wrong

[grim ice]

But like

where do I host it

[waxen plinth]

entity.setVelocity(entity.getVelocity().add(vector));

[grim ice]

@waxen plinth is it possible to make a website to write the messages that chatroom receives?

i mean it is possible but do you know some keywords I can use to search?

[sacred mountain]

o ok

ty

[gritty urchin]

hey

is there is a list of yaw and their direction values

e.g. NORTH, EAST, SOUTH, WEST

[grim ice]

ended up figuring thato ut

either way I need to learn html so fuck

[naive bolt]

whats the maven version for 1.8

just 1.8-R0.1-SNAPSHOT ?

[grim ice]

1.8.8 is what i use

[tidal hollow]

I have created an item but I want to make it only have one use, that is, when it is used it disappears. how could i do it?

[grim ice]

what is its use

[sterile token]

Yeah

[grim ice]

if its a breaking tool then check for break event then player's main hand

and replace it with air

[sterile token]

On maven you have only spigot-api, for using the spigot jar

[tidal hollow]

it is an item that when you right click gives you positive effects

it is not a tool

[dusk flicker]

You would want 1.8.8, not just 1.8, everything else as well

So in the end, 1.8.8-R0.1-SNAPSHOT

[tranquil viper]

I'm using essentials to give me a spawner, however, when I break the spawner it always says the .getSpawnedType() is PIG. Does anyone know how I should go about getting the real spawnedType?

[storm crescent]

Is there a way to clear out player data for all plugins?

[tranquil viper]

data should be cleared on restart/reload if they don't use a database

otherwise just clear the database

[storm crescent]

Alright thanks

[gritty urchin]

How to set look direction

of a bat?

yaw seems to be always 0

despite changing the direction with #setDirection()

of the entity

[midnight shore]

Then listen for a PlayerInteractEvent and if the action is click air or click block check if the amount of the ItemStack clicked is greater or equal to 2, if yes, subtract one from the ItemStack if no, set the ItemStack to be air

[midnight shore]

The direction is a vector getting the yaw and pitch to make a 3D line.

To set the yaw, make a new location, change the yaw and then teleport the bat to it

[main dew]

Hi how I can copy all world region? Exists API to do it without problems?

[sturdy ivy]

Like if I wanted to take a block by location how can I do that. I know there is getWorld().getBlockAt(x, y, z); but I have a problem because I want to loop this about 8mil times.

[tranquil viper]

Is it possible to copy a blocks persistentDataContainer?

And if so, how do you set one blocks persistentDataContainer to another block

[restive abyss]

why does it show an error i have the spigot jar added to the modules

[opal juniper]

what the hell are you doing 8 million times

[delicate lynx]

use something like maven or gradle. you cannot use the jar anymore as a module

[restive abyss]

whats that supposed to mean

[delicate lynx]

use a proper dependency handler like maven or gradle

[severe folio]

?maven

[undone axle]

https://www.spigotmc.org/wiki/spigot-maven/

[severe folio]

?gradle

kthen

[lavish hemlock]

I denounce Gradle

Maven is just

superior

[severe folio]

i like both

i just use maven

[low temple]

Gradle is for people who wash paper plates

[severe folio]

lmfao

[restive abyss]

ok thank you

[grim ice]

then after u run ur code

remove item from inventory

[restive abyss]

is the "minecraft developement" intelliji plugin good or no like should i set it up normally without it or is it actually helpful?

[opal juniper]

its good

doesnt require setting up really

[gloomy arch]

Hi, does anybody have suggestions for software that renders Minecraft chunks into like an isometric view 2d image?

[restive abyss]

ok thank you

[gloomy arch]

I want to do something like https://opensea.io/collection/lymmzy-chunks

[grim ice]

its good for everything related to mc development

not just spigot

[gloomy arch]

Not create NFTs but just the images

[grim ice]

even forge, paper, velocity, bungeecord

[restive abyss]

thx

[grim ice]

its amazing

[sturdy ivy]

Getting and saving blocks to a file.

[opal juniper]

but the game does that for you

[grim ice]

does using a method that returns an object for example

World.getAtBlock(x, y, z)

will the block

object keep it self in memory

(if we dont assign it to a variable)

[opal juniper]

The jvm should chuck the memory back in the heap eventually but it will exist for a little bit

[grim ice]

o

[midnight shore]

Wdym?

[grim ice]

so will creating a new thread every 100 blocks and doing operations for 8m blocks lag it

[midnight shore]

I think it will

[opal juniper]

the jvm is pretty smart, but im not sure exactly how it will work with that

[sick herald]

I am trying to use components for chat. I am using the component builder however the text I want is already colored so i cannot just do .color(ChatColor.something). An example of this is I am trying to allow users to type [item] in chat and display the item that they are currently holding. I am using hex colors for this so it has made my life a lot more complicated and i do not want to over complicate things if there is an easier solution. please let me know if you know one.

[grim ice]

for example:
(pseudo code)

for 8m blocks each 100 blocks make a new thread, and in that thread save the 100 blocks with their material name in a hashmap

not sure if thats even psuedo code

[sick herald]

what are you exactly trying to do? bukkit is not thread safe so everything has to be done on the main thread

[grim ice]

it isnt but yes

[lavish hemlock]

That's... not how that works.

[grim ice]

Somethings are thread safe some are not

most arent

[lavish hemlock]

Bukkit isn't thread-safe so you can't have shared mutable state.

But you could still easily have a bunch of asynchronous operations.

[midnight shore]

Couldn’t you have a listener for chat messages and if it contains [item] replace that with the held item’s name?

[grim ice]

will this lag the server

[sick herald]

thats the easy part

[midnight shore]

Obviously yes

[grim ice]

imagine if the hashmap suddenly disappears

will the memory still have something related to what we just did

[midnight shore]

Why would it? If it is deleted

[grim ice]

Yes, deleted

[sick herald]

the name is not this... the real name is a bunch of hex colors

real name

[midnight shore]

Oh do you want precisely hex colors?

That’s not as easy as I thought

[sick herald]

if the object is deleted then the memory will be freed

[grim ice]

how about the blocks

the getBlockAt method, will it keep the blocks on memory

[midnight shore]

They will be there in the world but not in the hashmap

[grim ice]

I know

ahhhh 1s lemme say it simpler

i looped through 8 million entries without creating new variables, printed out each one, what will happen to memory after the process is finished

[sick herald]

in order to do that I would have to do something like new ComponentBuilder().color(ChatColor.of("#0000FF")).append(text to be colored).create however the string that I am appending is already pre colored

[midnight shore]

Anyways Why would you save that amount of blocks?

[sturdy ivy]

Is there a faster way to do it?

[midnight shore]

If you are not saving it in any persistent place the memory will be freed

[midnight shore]

Sadly I think no

[grim ice]

./fill (limit of 32k blocks and its prob the same so ignore that)

:o

[sick herald]

bukkit will handle that, the blocks were either previously loaded in memory or if the chunks were unloaded, bukkit will load them and then unload them. I am not entirely sure on the second part of my statement but bukkit handles all of it

[midnight shore]

So why would you color it again?

[grim ice]

what if it wasnt using bukkit

[midnight shore]

Then what are you using? NMS

[sick herald]

thats how the component builder works, thats how you should color things, however it makes it complicated for me to get hex colors from a string like this §x§0§0§F§B§2§8D§x§0§0§F§4§4§9i§x§0§0§E§D§6§Aa§x§0§0§E§7§8§Am§x§0§0§E§0§A§Bo§x§0§0§D§9§C§Cn§x§0§0§D§2§E§Dd §x§0§1§B§F§F§9P§x§0§4§9§F§F§2i§x§0§6§7§F§E§Bc§x§0§9§6§0§E§4k§x§0§B§4§0§D§Ca§x§0§E§2§0§D§5x§x§1§0§0§0§C§Ee

[midnight shore]

?

[opal juniper]

you could try using chunksnapshots

[grim ice]

Not minecraft related

just java

[sick herald]

well

thats a whole different story

[sturdy ivy]

I want to make that on mc versions from 1.8 to 1.18.1

[ancient jackal]

is there a way to remove warnings for CommandExecutor onCommand overrides?

[midnight shore]

Oh my god

[sick herald]

you see my pain now... lol

[midnight shore]

Then you can trim the colors off and color it after?

[sick herald]

can you try to explain what you are trying to do exactly so we can give you a definitive answer without a bunch of unknowns/whatifs?

[midnight shore]

No no

Wait

[opal juniper]

right, i have done something like this recently for multiversions - i had to use multiple modules for that cause on older versions the getMaterial returns an int. but eh it might not be that much faster

[grim ice]

what if u get an object from an arraylist, then without assigning it to a variable, u perform operations to it

will the memory still keep the object in memory

if so for how long

[sick herald]

my thought process is strip the color, turn it into a char[] (since each letter has a different color because of the gradient) and then translate the color of that letter to a hex color so §x§0§0§0§0§F§F -> #0000FF and then apply the color one by one, but i dont want to overlook an easier solution first lol

[ancient jackal]

yes because it's reference and lasts until gc sees there are no more references

[midnight shore]

If you get it from an array it is already a variable tho

[lavish hemlock]

Yeah

[ancient jackal]

I wouldn't worry about memory in java for a start unless you're using large amounts of data, then you should just worry about how much you're actually taking up

[lavish hemlock]

Also there is no real difference between assigning a variable and not assigning it

[sick herald]

if the array list exist then it is already in memory. your operation is just pointing to the one that is already in memory rather than putting another copy of it in memory

[lavish hemlock]

You're still pushing the reference to the stack internally

[midnight shore]

Its the only thing I can think of…

[lavish hemlock]

Difference is if the reference persists in that method through the frame's locals

(Which it will if the variable is then used later on, e.g. loading it through ALOAD <index>)

So yeah no there is no real difference.

[grim ice]

o

[midnight shore]

Could you say what are you trying to do with 8 mil blocks? Maybe there is a simpler way… just explain

[grim ice]

its not my problem it's someone elses and he just dipped but im wondering how would u replace 8 million blocks

[sick herald]

i learned java a couple months ago and it took months for me to understand pointers and such but if memory usage is a concern, i would try to get a good understanding of pointers (assuming you dont have one already)

[midnight shore]

The best performant way i can think of is by dividing them in 1.000 blocks sections and do them

[ancient jackal]

simple answer is anything created inside of a block is dead when the block is exited

[midnight shore]

Cause by counting them one by one you are adding bytes to the for loop I guess

[lavish hemlock]

Not technically true, but it is a simple way to look at it.

[midnight shore]

So by making more you free some space

[lavish hemlock]

Technically blocks are just syntactic sugar.

[ancient jackal]

basically true too though

[lavish hemlock]

Primitive values are bound to a method while the method is being executed.

[ancient jackal]

gc will get it

[grim ice]

wym

[grim ice]

ic

[grim ice]

alr

[lavish hemlock]

This is because they are either:

• Locals from the method's parameters (which are copied to the method on invocation by the JVM)
• Constants from the class's constant pool

[sick herald]

from experience there are 2 ways to do this well, one, use FAWE's API. two, you have to do some math and split your operations between multiple ticks whilst tracking how long each tick is taking to keep the MSPT under 50. After messing with the second option and rewriting a lot of code a lot of times, i recommend option 1.

[lavish hemlock]

Meanwhile, references are cleaned by the GC, instead of just cleaning out the method's operand stack after execution.

[grim ice]

ic

anyone knows a guide to performance optimization

[ancient jackal]

for(int i = 0; i < 5; i++) {
  int x = 2;
  System.out.println(x);
}```
what happens to x and i @lavish hemlock

[lavish hemlock]

Uhh you mean for code or for servers?

[grim ice]

code

I wanna make my code faster

[sick herald]

what is your code

[midnight shore]

Faster to write or faster to read for minecraft?

[grim ice]

Not a certain project

Faster to run

[sick herald]

you cant just ask your code to run faster generically, you have to optimize it piece by piece

[grim ice]

Yes but what are rules to follow

to make performing software

[sick herald]

get a faster cpu and faster memory - best generic way lol

[lavish hemlock]

x gets popped from the operand stack on the println invocation, and I'm pretty sure i's value is only ever used as a local that is loaded and stored at the start and end of the for statement.

[grim ice]

while(true) will still make a memory leak even if u have ultra gaming cpu

[lavish hemlock]

Oh and actually x is likely an ICONST_2 instruction considering it is never used beyond the println

[ancient jackal]

what happens to it when the for loop is done and the code goes on

[midnight shore]

There aren’t a lot of ways to boost performance, whatever you handle will count towards your performance. It doesn’t really change if you have an array or a list

[lavish hemlock]

Well they don't exist after the for loop because they were used (popped) by previous instructions.

Syntactically, they are bound to that scope.

Compiled, they are just values.

[ancient jackal]

that's what I meant here

[lavish hemlock]

It's true on a language level but when it comes to how the program actually executes it's false.

[midnight shore]

FAWE Does a lot of calculations, for example if you have a plain 512x512 it will divide into smaller pieces to decrease the amount of data processed

[sick herald]

it also doesnt rely on bukkit so it runs incredibly fast

[lavish hemlock]

Let's see...

[ancient jackal]

well I'm coding in java and understand that the variables will quickly go away from memory after leaving a block

[midnight shore]

Yeah

[lavish hemlock]

Okay so immediately we have a constant of value 0 (this is the i = 0 assignment)

This is then stored and loaded because the compiler is shit

We push another constant of value 5 and compare it to the previous 0 (which we just loaded)

(i < 5)

[gloomy arch]

A memory leak is when you have objects that don’t get deallocated. In Java, the garbage collector should automatically be handling that. If you want to write more performant code in general, I would start off with looking for places where you can lower computational complexity.

[lavish hemlock]

Push constant 2, that's the x = 2, which gets stored so we can shift its position around in the operand stack.

[glossy venture]

what are those numbers after getstatic

[grim ice]

why do they not get deallocated

[glossy venture]

and invokevirtual

[ancient jackal]

what happens to the variables and constants in the end

[lavish hemlock]

Uhhh we get System.out, load x again, invoke println and then increment i

Then we go back to pc 2 and do another comparison

[lavish hemlock]

Constant indices

[grim ice]

I get that they're always marked alive, but how did they end up like that

[lavish hemlock]

That one points to a Fieldref

Which is a combination of a Class and NameAndType constant

[gloomy arch]

In languages like C, you have to allocate the memory for your objects yourself. So you also have to take care of deallocating that memory. In Java, to allocate memory you just call new Object()

[lavish hemlock]

They disappear, they're not "cleaned."

[glossy venture]

why are they constant integers, couldnt the bytecode just contains fully qualified names and then the jvm can map them directly to memory addresses once the class is loaded

[ancient jackal]

what is your meaning of "cleaned" here

and what makes them disappear?

[lavish hemlock]

They're not passed to the GC.

They disappear because the instructions in front of them use them.

[grim ice]

O

[ancient jackal]

why can't you use them anymore?

[grim ice]

damn C must be literal pain

[lavish hemlock]

Well you could, actually.

There's no scoping.

[grim ice]

also to get rid of them early you can do object = null

right

[lavish hemlock]

You can just throw in a ILOAD to retrieve i or x again.

[grim ice]

but what if if u dont have a variable of it, how to clean it from memory

[lavish hemlock]

If that's the only reference, maybe?

[ancient jackal]

so a for loop with 10,000,000 iterations will leave 10,000,000 extra values in your memory until you exit the program?

[gloomy arch]

Yeah that wouldn’t deallocate it early. I believe you can call garbage collector directly

[lavish hemlock]

Well the bytecode does actually store the qualified names.

[grim ice]

what

[lavish hemlock]

They're stored as Utf8 constants which other constants refer to.

[glossy venture]

no, it increments one value on the stack taking up the size of one int (4 bytes)

[grim ice]

btw pls ping me when u reply to my msg

[severe folio]

do u mean System.gc()?

[glossy venture]

except if you make more

but any variables inside the loop are cleared from the stack per iteration i think

[lavish hemlock]

And stack memory is pretty different from heap memory.

[lavish hemlock]

Yes

[grim ice]

"You can delete an object in Java by removing the reference to it by assigning null. After that, it will be automatically deleted by the Garbage Collector. You set it to null. Java doesn't give you the option to deallocate memory."

F

[ancient jackal]

what if Object o = new Object() was in there?

[glossy venture]

it would be cleaned by the garbage collector

when it sweeps

[ancient jackal]

and that's my point

[lavish hemlock]

Yeah but the GC doesn't take into account scope here

[grim ice]

del object;

L

[glossy venture]

kinda sucks that that isnt a thing

[grim ice]

lol

[lavish hemlock]

It just knows that, since nothing in the program has used that reference, it should clean the reference.

[glossy venture]

it would make stuff a lot faster, that developers can choose to manually manage memory if they want performance

[grim ice]

i mean object = null; does the thing as google says

[lavish hemlock]

I think that'd be cool, yeah.

[glossy venture]

yeah

[lost matrix]

I mean... you simply dereference an Object.

[lavish hemlock]

But you'd struggle with the problem of "what happens to object"

[glossy venture]

?

[lost matrix]

Or do you mean that you want to manually free memory on the spot?

[ancient jackal]

well we're using Java here so try to use a variable from a nested block

[glossy venture]

yeah

[glossy venture]

like a System.free(Object) or something

or even a System.finalize(Object) to force the gc to clean it

[grim ice]

yeah like System.gc.collect(Object)

[ancient jackal]

{
  int x = 1;
}
System.out.println(x);```

[grim ice]

or smth idk

[lavish hemlock]

Just never use managed memory :) @glossy venture Only ever Unsafe

[lost matrix]

This would fk with the garbage collector because the freed space could be anywhere.
Would pretty much decrease performance because all that out of order memory management
would be quite expensive.

[glossy venture]

lmfao yeah

best idea ever

[lavish hemlock]

It basically becomes like

a higher-level C

at that point

[gloomy arch]

Kind of semantics here. Basically the way garbage collector works is it looks for objects that don’t have any references to it. So by pointing the reference to null, the original object no longer has a reference which allows gc to pick it up

[glossy venture]

Object o = unsafe.allocateInstance(MyClass.class);
unsafe.invokeMethod("<init>", o, ...); // idk if this is an actual method

[lavish hemlock]

I should make a project that allows you to use Java as if it were a low-level language.

[gloomy arch]

Also this is how in C you would get a memory leak. Since there is no GC

[lost matrix]

*If there is not another reference to that object somewhere.
But thats a part why strong encapsulation is important.

[lavish hemlock]

You probably can't do that.

[grim ice]

which happens automatically even if you dont set it to null. right?

[glossy venture]

yeah i know

[ancient jackal]

when you leave a block, consider the object dead, gone, left for gc to put it simply. so right

[glossy venture]

but with reflection you might be able to just call the <init> method

on an object

[lavish hemlock]

I don't think reflection allows you to do that unfortunately :p

[glossy venture]

bruh

[gloomy arch]

Yeah exactly say when a method finishes, all of the local objects get cleaned

[glossy venture]

top 10 biggest bruh moments

[lavish hemlock]

If there were a way to inject an invokespecial though...

[glossy venture]

there is with asm right

[grim ice]

a class has a block of code

[lavish hemlock]

Welllll

If you use classloading hacks, then yeah

[grim ice]

i can close the class block of code and then access the var from another class

it will not get cleaned, will it

[lavish hemlock]

Y'know what I am totally gonna make the world's hackiest Java library

[glossy venture]

i wonder how hard it is to implement a System.free(Object)

[glossy venture]

yes please

[ancient jackal]

if you create an object with the class, the variables are still there from within an object. public and static variables are accessible

[lavish hemlock]

A combination of Unsafe and classloading/ASM hacks >:)

[lost matrix]

It already exists. Its called Gson.
Look up how Gson instantiates classes that have no no-args constructor. Its funny.

[quaint mantle]

Who needs it anyways

[lavish hemlock]

@glossy venture Quick, Orby, give me a name for a manual memory management Java lib

[lost matrix]

How about we leave the poor memory alone? The biggest benefit of java is that we dont have to worry about that.

[glossy venture]

like wouldnt it just be

public static native void free(Object obj);

JNIEXPORT void JNICALL Java_java_lang_System_free(JNIEnv *env, jobject obj) {
  someMagicJvmDestroyObject(obj);
}

[ancient jackal]

manmemman

[glossy venture]

yes

[glossy venture]

meman

memman

[lavish hemlock]

meman

[ancient jackal]

maneman

[lavish hemlock]

yes

[glossy venture]

manenemaneman

[lost matrix]

Without finalizing the Objects? This will just crash everything that might point to anything inside that memory block.

[ancient jackal]

manemanemanemamenamenamnamen

[lavish hemlock]

Well finalizers are deprecated now.

[grim ice]

what are tips to make software more performing though

[glossy venture]

ok maybe call finalize too

[grim ice]

even the least bits of performance is good for me

[gloomy arch]

This is a pretty big question

[gloomy arch]

And it really depends on your use case

Generally, multi threading and lowering computational complexity

[lost matrix]

https://www.spigotmc.org/threads/guide-beginners-guide-on-improving-your-codes-performance.396161/

[grim ice]

man has guides on everything

tysm

[ancient jackal]

just makes things as simple as possible tbh

[glossy venture]

i am currently looking through the jdk hotspot source to find the sacred someMagicJvmMethodToDestroyObject

[grim ice]

alright and i also need

some thing like SOLID to learn

to make my projects more OOP styled ig?

[lost matrix]

Program alot. You will see that if you try to think about how to write cleaner code you will discover most of those principles by your own.
The SRP (Single Responsibility Principle) kind of leads to the rest. So focus on that first.

[tranquil viper]

Can you copy a blocks persistentDataContainer and put it on a different item?

[ancient jackal]

wait so @lavish hemlock in this code segment from one of my plugins,

            Map<EntityType, Integer> entityMap = new HashMap<>();
            for(Entity e : c.getEntities()) {
                EntityType k = e.getType(); // k is EntityType in entityMap
                if(entityMap.containsKey(k)) {
                    entityMap.put(k, entityMap.get(k) + 1); // Sets EntityType key to previous value +1
                } else {
                    entityMap.put(k, 1); // Sets amount of EntityType to 1
                }
            }```
the variable k isn't actually created but e is just referenced 4 times? or would e only be referenced if there was only 1 reference to k?

[lost matrix]

Sure. But you cant just replace a pdc. You need to iterate over the keys and copy its content.

[hexed hatch]

Yup, PDC is implemented the same for everything that supports it iirc

[grim ice]

btw i should just make ur spigot profile bookmarked, literally a wikipedia tbh

[lavish hemlock]

Oh yeah so basically k is just the following:

INVOKEVIRTUAL Entity::getType
ASTORE <index>

[ancient jackal]

oh that's cool, I didn't know

[lavish hemlock]

And actually that for loop there

Is just syntactic sugar

It compiles down to iterator access

So e comes from like iterator.next()

[ancient jackal]

so what would that actually look like?

oh

[lavish hemlock]

I am breaking your perception of Java, aren't I?

[ancient jackal]

the way it works yeah

but not the way to write it or anhthing that like

like that*

[tranquil viper]

((CreatureSpawner) blockA).getPersistentDataContainer().getKeys().forEach(key -> {
                   blockBMeta.getPersistentDataContainer().set(key, //what goes here);
               });

[lavish hemlock]

I wonder how much of this I can convert to bytecode from memory

[lost matrix]

Write a utility method for that.

  public static void copyContents(PersistentDataHolder donor, PersistentDataHolder receiver) {

  }

[tranquil viper]

Either way, still wouldn't know what to put in //what goes here

[grim ice]

btw what do I do if i have some utility method like this for example, where do i store it

in a way that it doesnt break SRP

[lost matrix]

Hm i just realised that this is a bit tricky because you dont know the persistent data types of each entry. And they could be custom ones.

[glossy venture]

https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/nio/Heap-X-Buffer.java.template

wait they have a preprocessor

[tranquil viper]

Yup exactly what I was struggling with

[lost matrix]

If the functionalities of the methods are stateless then a utility class with static methods only, is ok.

[grim ice]

O ok

what does stateless mean

[lost matrix]

Basically no context stored between two method calls. If you have fields then you have a state.

[blazing scarab]

new Copied(from, to).copy() you know

[fervent gate]

package me.cosmic.farmingpluginfordvddevroom;

import org.bukkit.plugin.java.JavaPlugin;

public final class Farming extends JavaPlugin {

    @Override
    public void onEnable() {
        // Plugin startup logic

        getConfig().addDefault("FarmLevelIncrement", 10);
        getConfig().addDefault("PercentChanceOfGettingRewardOnBreakingCrops", 0.001);
        getConfig().addDefault("Pools.Tier1Pool.FarmLevelMax", "200");
        getConfig().addDefault("Pools.Tier1Pool.Rewards", "diamond");
        getConfig().options().copyDefaults(true);
        saveDefaultConfig();

    }
}
```The config doesn't have any values. This is the class, there are no errors and the config is successfully created.

[delicate lynx]

create a new config and try to add the values to that instead

[lost matrix]

saveDefaultConfig just writes your config.yml to disk. You need to call saveConfig() which will save the FileConfiguration you are currently editing to disk.

[tranquil viper]

Let me explain my issue and see if you can help then, since I'm not sure where to go from here now. I having a plugin that stacks spawners (custom coded). When giving myself a spawner through essentialsx and stacking it, it works, however, when I try to break the spawner it drops the proper spawner. Then upon placement, instead of going to the correct spawner type it goes to a pig spawner.

[tranquil viper]

I was just copying the block data but since essentialsx uses psd to store the spawner type there isn't much I can do without having access to the psd value

[fervent gate]

That works, can't believe I missed that. Thanks!

[lost matrix]

Ah i see. You could iterate through all primitive types for each key and copy them based on that.
Even custom types should be interpretable as their primitive raw data. Let me think of a quick impl of that.

[quaint mantle]

yo smile, how would i serialize an array<itemstack> with this instead of just an itemstack?

[lost matrix]

https://gist.github.com/graywolf336/8153678

[glossy venture]

the java parser implementation is 5000 lines and its somehow very readable

i severely misread the number lmao

[lavish hemlock]

??? = What I don't know, since it's a small code snippet.
Also some of the store/load indices are obviously gonna be off, but I tried my best.

new java/util/HashMap
invokespecial java/util/HashMap, <init>()V
astore 1
aload ???
invokevirtual ???, getEntities()Ljava/util/List;
invokevirtual java/util/List, iterator()Ljava/util/Iterator;
astore 2
aload 2
invokevirtual java/util/Iterator, hasNext()Z
if_icmpeq 0, /* SNIPPET END > */
invokevirtual Entity, getType()LEntityType;
astore 3
aload 1
aload 3
invokevirtual java/util/Map, containsKey(Ljava/lang/Object;)Z
if_icmpeq 0, /* ELSE BRANCH > */
aload 1
aload 3
dup2
invokevirtual java/util/Map, get(Ljava/lang/Object;)Ljava/lang/Object;
// I actually don't know if this is how the compiler auto-unboxes, but I assume so:
checkcast java/lang/Integer
invokevirtual java/lang/Integer, intValue()I
iconst 1
iadd
invokevirtual java/util/Map, put(Ljava/lang/Object;Ljava/lang/Object;)V
// > ELSE BRANCH
aload 1
aload 3
iconst 1
invokevirtual java/util/Map put(Ljava/lang/Object;Ljava/lang/Object;)V
// > SNIPPET END

That should be it ^

[quaint mantle]

Ok, so I have implemented this into a class, but what do i do with the base64 data once i have it?

do i do .tojson

[waxen plinth]

This is more verbose than needed

[glossy venture]

what happens if you remove the checkcast

[lavish hemlock]

Mismatched types

[glossy venture]

will it attempt to cast anything

[lavish hemlock]

Just realized I didn't cast anything else

So that is not the full method

But I do not care

[glossy venture]

but keeping k is better for performance as getType() doesnt have to get called, i actually think the compiler might optimize four e.getType() calls into a variable automatically but im not sure

[lavish hemlock]

In fact you'd probably get some kind of LinkageError

[lost matrix]

Try if this works

  private static final List<PersistentDataType<?, ?>> types = new ArrayList<>(){{
    add(PersistentDataType.TAG_CONTAINER_ARRAY);
    add(PersistentDataType.TAG_CONTAINER);
    add(PersistentDataType.STRING);
    add(PersistentDataType.LONG_ARRAY);
    add(PersistentDataType.INTEGER_ARRAY);
    add(PersistentDataType.BYTE_ARRAY);
    add(PersistentDataType.LONG);
    add(PersistentDataType.DOUBLE);
    add(PersistentDataType.INTEGER);
    add(PersistentDataType.FLOAT);
    add(PersistentDataType.SHORT);
    add(PersistentDataType.BYTE);
  }};

  @SuppressWarnings("unchecked")
  public static void copyContents(PersistentDataHolder donor, PersistentDataHolder receiver) {
    Preconditions.checkArgument(donor != null && receiver != null);
    PersistentDataContainer donorContainer = donor.getPersistentDataContainer();
    PersistentDataContainer receiverContainer = receiver.getPersistentDataContainer();
    for (NamespacedKey key : donorContainer.getKeys()) {
      for (PersistentDataType<?, ?> type : types) {
        if (donorContainer.has(key, type)) {
          receiverContainer.set(key, type.getClass().cast(type), Objects.requireNonNull(donorContainer.get(key, type)));
        }
      }
    }
  }

If not you need to switch-case your way through the keys

[glossy venture]

maow human compiler

[quaint mantle]

i meant an arraylist, i thought that and arrays were the same thing

[lavish hemlock]

Indeed.

[brave sparrow]

They aren’t, but you can convert an ArrayList to an array trivially

[lavish hemlock]

Java was not a language meant to be hand-compiled, though.

[mortal hare]

lets say i have map:

Map<Integer, ItemStack> map = new HashMap<>();

is there any way to get this class object safely without generic warnings?
by using .getClass() is get Class<capture ? extends Map>, and in order to get Class<Map<Integer, Object>>, i need to cast it, but that prompts me as a warning that the variable is not safe to cast

[lavish hemlock]

Perhaps with a decent assembler, stuff like Jasmin could've kicked off :p

[quaint mantle]

ik that now but idk what trivially is

[lost matrix]

An array list is just an array in the end

[brave sparrow]

Easily

[quaint mantle]

but i cant use .add

which i need

[brave sparrow]

?learnjava

[undone axle]

Here are some links to get you started on learning Java:

• https://www.codecademy.com/learn/learn-java
• https://www.sololearn.com/learning/1068
• https://www.learnjavaonline.org/
• https://programmingbydoing.com/
• https://docs.oracle.com/javase/tutorial/java/index.html

The last one is the only official one, however some of those concepts assume that you already know a bit about programming.

[mortal hare]

generics

[lost matrix]

    List<ItemStack> itemList = ...;
    ItemStack[] array = itemList.toArray(new ItemStack[0]);

This is something you should duckduckgo (google)

[quaint mantle]

alright

[karmic grove]

> BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 61

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
``` anyone know what this means when i try to build

[lost matrix]

Unsupported class file major version 61

Use a newer gradle version

[karmic grove]

ok

[ancient jackal]

Wdym?

It does 3 specific things

Checks if the key is in the map, if it is then add 1 to the key’s value

Other wise add the key with a value of 1

[waxen plinth]

Map<EntityType, Integer> entityMap = new HashMap<>();
Arrays.stream(c.getEntities()).forEach(e -> entityMap.compute(e.getType(), (k, v) -> v == null ? 1 : v + 1));```

[ancient jackal]

Without a stream?

[waxen plinth]

for (Entity entity : c.getEntities()) {
  entityMap.compute(entity.getType(), (k, v) -> v == null ? 1 : v + 1);
}```

[ancient jackal]

I think it’s quicker to understand a simple if else tbh

[grim ice]

nah what redempt did is more readable imo

if else looks ugly

[lost matrix]

    Map<EntityType, Integer> entityMap = new HashMap<>();
    c.getEntities().stream().map(Entity::getType).forEach(type -> entityMap.compute(type, (k, v) -> v == null ? 1 : v + 1));

[lost matrix]

sniped -.-

[waxen plinth]

lol

If you don't wanna use compute you could even do it with put

[eager hazel]

Anyone can help?

[ancient jackal]

Well if you want to fork it and replace it then go ahead but personally I think the if else is easier to understand

[waxen plinth]

for (Entity entity : c.getEntities()) {
  EntityType type = entity.getType()
  entityMap.put(type, entityMap.containsKey(type) ? entityMap.get(type) + 1 : 1);
}```

But that's gonna be much slower than compute

Since compute only needs to do one hash operation and one lookup, it should be a bit faster than the other methods which involve performing multiple lookups on the map

[lost matrix]

I mean... "much slower". We are still speaking of O(1) ops here.

[waxen plinth]

Right sorry

I'm a micro-optimizations guy lol

[lost matrix]

Noticed that ^^

[waxen plinth]

It won't make a noticable difference

But you could use an EnumMap!

[lost matrix]

...

[waxen plinth]

Map<EntityType, Integer> entityMap = new EnumMap<>(EntityType.class);
Arrays.stream(c.getEntities()).forEach(e -> entityMap.compute(e.getType(), (k, v) -> v == null ? 1 : v + 1));```

Slightly faster 🔥

[mortal hare]

compute is way much cleaner and better in some cases

at least for me

especially for creating new objects

[waxen plinth]

I mean I guess you shouldn't use a stream if you want the fastest but still

[mortal hare]

that are not existant in the map

[grim ice]

btw dont check if it contains k, just entityMap.put(k, Optional.ofNullable(entityMap.get(k).orElse(0) + 1));

I think that's faster, right?

[lost matrix]

Nothing else you can do besides carefully reading the article, looking at a chunk with an nbt explorer and reverse engineering your way through it.

[grim ice]

what redempt and others said is faster either way but yes

[mortal hare]

its way better to use computeIfAbsent(key, (key) -> new RandomObject()) than putIfAbsent(key, new RandomObject()) since the argument init in the first case would be lazy (it wouldnt create a new object if the key already present in the map)

[grim ice]

but I've heard that using streams in hot loops can be bad, so if you use stream in loops often it can become slower than a normal loop

[eager hazel]

I get it, it's not a trivial task, блять :(

[lost matrix]

Been there. In 1.15 i had the task to send completely fabricated chunk packets async. Took me a while to figure out how the format works.

And dont get me started on lighting the chunks afterwards...

[mortal hare]

that's actually the case due to everhead the stream api adds up

but for example you can do parallel streams which could be faster than for loops

since it utilise parallelism internally

[quaint mantle]

Yo! Is this the channel where I can ask for help with coding problems??? 🙂

[grim ice]

another thing to search "parallel streams" tysm

[lost matrix]

Which decreases performance even more unless you have a gigantic amount of data.
And im speaking of expensive operations on several 100k objects.

[eager hazel]

Can you share a code example? it will be easier than dealing with the format from scratch

[grim ice]

o

[mortal hare]

i wanted to add up to that but you were faster

[lost matrix]

Yes

[olive lance]

does onDisable get ran on /reload?

[grim ice]

Yes

[mortal hare]

yes

[olive lance]

ok

not sure what happening with my thing then

[lost matrix]

Sry but i cant share code from that project

[olive lance]

ill keep u updated

[quaint mantle]

Yay! Awesome :3 I'll start asking a way then. :>

[eager hazel]

😩

[chrome beacon]

wiki.vg has documentation and example implementations available

It's a good start

[mortal hare]

wiki.vg is so helpful

sometimes

[chrome beacon]

Agreed

[sterile token]

Hi i have a question, you are the one that used to work on Skript plugin?

[mortal hare]

hehe i used to write skripts 2 years ago

i jumped on java since then

i swear you saw my old posts on skunity

[eager hazel]

Thanks 😅

[quaint mantle]

So, if anyone can help me with like ehm, a bunch of things! First of all, I just started to learn to do coding with Java. So everything is new. But I've managed to setup the foundation of a Spigot plugin. That when I click run from IntelliJ. It completes perfectly.

But anyway, basically I would like to know now how do I make a loading screen? Is it possible? So I created a class under src > main > ehm I forget the rest after that. But it's how it should be. Down the line I created a class called 'Startup Loading Screen'.

Now I just gotta put in some code to get it running. To be clear, I wouldn't want anyone to write me code. Although I would love that. But I would rather learn like the building blocks for it. So what exactly is that Spigot page on the web where it lists all of these Classes, Tree, etc. All Bukkit things. That's the API, I know that much. But what do I use that for? What exactly is an API? Is it syntax that falls under Java syntax? Like a made up language that Spigot uses to make it easier for people to code with Spigot? Or is it something else?

Sorry about the long post. Just very new is all. I would really like to know if I can use that site to understand how to make some code for the 'loading screen'.

Okay I'll stop typing now 😛

[mortal hare]

https://forums.skunity.com/threads/minecraft-font-to-unicode-font-converter.10676/

😄

i literally used java's packages inside skript back then

[drowsy helm]

what exactly do you mean by a loading screen?

as in like a black screen when the player joins or something?

[mortal hare]

do you want a title text

that says Loading...

[quaint mantle]

Oh like, I would like to just place a blank black screen when loading up the majority of things in my server :)))

And yeah a loading . . . thing also would be nice 😛

[mortal hare]

Minecraft is not a game engine remember that, you need to be creative to do these sorts of things

i would suggest you to build a room inside your server filled with itemframes with a white background

and teleporting player there

or just use end dimension blocks or end dimension itself

as a background

[wooden fable]

Hey, i'm trying to compile a plugin with WorldGuard as a dependency. But it doesn't compile:

cannot access com.sk89q.worldguard.WorldGuard

pom.xml:

        <repository>
            <id>sk89q-repo</id>
            <url>https://maven.enginehub.org/repo/</url>
        </repository>

        <dependency>
            <groupId>com.sk89q.worldguard</groupId>
            <artifactId>worldguard-bukkit</artifactId>
            <version>7.0.6</version>
            <scope>provided</scope>
        </dependency>

1.12.2 btw

[chrome beacon]

How are you compiling

[wooden fable]

Maven install

[delicate lynx]

do package

[chrome beacon]

Install works fine

[wooden fable]

Package doesn't work to

[lost matrix]

Did you add the worldguard jar besides just adding it as a dependency in your pom.xml?

[wooden fable]

No

[quaint mantle]

I'll look into that.

Is there a way to manipulate the default minecraft loading screen though? Like get into its source code and stuff and tweak it to use another image? Or would that be only for Forge mods and stuff to do that??? I don't know how limiting Spigot is. That's why was wondering about the API thing that Spigot links where it has all this information about all the different things the API does :>

[delicate lynx]

loading screen cannot be changed via server unless it's a resource pack

[quaint mantle]

Bugger D:

[mortal hare]

that's client sided thing

[delicate lynx]

but I don't think the loading screen will even show

since when you disconnect it unloads it

[mortal hare]

you cant modify that unless you prompt players to download your own resource pack

then you can have some wizardry of customizability

[quaint mantle]

Oh dam dam dam XD Trying to make it that the client doesn't have to download anything :S

[mortal hare]

well server allows you to send resource pack to players

[wet breach]

client is going to have to download something, otherwise how will it know 🙂

[mortal hare]

all they need to do is to click allow

whenever they join a server

^ nice resolution google

loving it

[quaint mantle]

Yeah I'm gonna make a resource pack then. 😛 I'll Google on how to and stuff. Thank you all for the help! I'll ask away later on if I'm having trouble again 🙂

[mortal hare]

but you can do it without that, but it would be limited loading screen

you cant do that stuff as flexible as resource packs can be

[chrome beacon]

So basically Spigot is server side only. This means things are limited. For example you cannot change rendering, add custom blocks and items. You can however use resourcepacks to simulate more items and blocks by using model data and unused block states.

If you're new I suggest starting with something easy and work your way up. I've seen too many people try to do advanced things right away and get stuck.

[lost matrix]

Do you have other dependencies that also depend on worldguard and might use an older version?

[quaint mantle]

With a resource pack, can I change the HUD, etc? Like creating bars and stuff around the screen or do anything basically, visually????

[chrome beacon]

Yes but it's tricky

I suggest starting with something easier

[lost matrix]

Only with a lot of trickery. What you can access is the standard UI of minecraft. Actionbars, Health, food, bossbars etc

[quaint mantle]

I'm trying to do that. I just need to know where I can find the library of coding terms and stuff for Spigot. Then I can read about what each one does and stuff. Which would be very cool. Cause then I know the fundamentals of what a certain coding word does 🙂

[mortal hare]

Minecraft is a sandbox game, you need to creative to be play it and modify it to your needs

[lost matrix]

?learnjava

[undone axle]

Here are some links to get you started on learning Java:

• https://www.codecademy.com/learn/learn-java
• https://www.sololearn.com/learning/1068
• https://www.learnjavaonline.org/
• https://programmingbydoing.com/
• https://docs.oracle.com/javase/tutorial/java/index.html

The last one is the only official one, however some of those concepts assume that you already know a bit about programming.

[wooden fable]

Maybe

depend: [ KingdomCraft, ProtocolLib, WorldGuard ] #KingdomCraft uses WorldGuard

Should i try to use the version of KingdomCraft's Worldguard?

[lost matrix]

https://www.spigotmc.org/wiki/spigot-plugin-development/

[chrome beacon]

?jd-s

[undone axle]

https://hub.spigotmc.org/javadocs/spigot

[lost matrix]

Im speaking of maven dependencies not runtime ones

[lost matrix]

Basically paste your whole pom

[mortal hare]

this turned:

Map<Player, List<Pair<Integer, Pair<ItemStack, ObjectDataFile<List<ItemStack>>>>>>

into:

Map<Player, InventoryDataStorage> 

how great

[wooden fable]

https://pastebin.com/kMtUS2KK

[quaint mantle]

Okay just oooonnnneeee last little thing? What exactly is an API???? I've tried reading into it. But it doesn't make much sense for my brain XD Is it an additional language thing used, to make coding/programming easier for the person writing code????

[tranquil viper]

any ideas smile?

[chrome beacon]

Basically a bunch of classes and methods that are designed to be used by others in their projects

[tranquil viper]

shouldn't the capture of ? be Z?

[lost matrix]

Order of dependencies matter a bit. But spigot at first and wg at last.

[quaint mantle]

Okay now it's making more sense! Okay I'll stop with the questions now 😛 Thank you

[mortal hare]

Lets say you have a car, you have crucial components like engine, and you have a car salon (radio, wheel, hand brakes), API is literally that. it allows you to safely tinker with the "engine", without thinking too much about its technical characteristics

Engine makes your car drive, but wheel makes your car drive wherever you want

[chrome beacon]

Keep asking questions it's a good way to learn :) also my DMs are open if you need me

[olive lance]

logic folks is this going to work how it sounds https://paste.md-5.net/uhabemoyis.cs

or perhaps a better way to compare them

[wooden fable]

https://pastebin.com/st5vtGws

Still doesn't work

[olive lance]

also how would i override hashcode with this

[lost matrix]

equals must be implemented so that x.equals(y) == y.equals(x)
Sou you have a bit of double checking in there

[chrome beacon]

If you're using Intellij you can use ALT + Insert to let it generate equals and hashcode :)

[olive lance]

it generated this public int hashCode() { return Objects.hash(f1, f2); } but i want them to be equal even if the 2 factions exist in the different variable

unordered

maybe i could use a unordered set

[mortal hare]

i've never implemented equals() before, but i think if (o == null || getClass() != o.getClass()) return false; could be replaced with if (!(object instanceof Alliance)) return false; since instanceof allows you to check for null values and the class type at the same time, and you're casting to Alliance object after the comparison, it would fail if the classes would be different than the Alliance

[brave sparrow]

They return if the classes are different, so it’ll never get to the cast

[olive lance]

that part was generated by intellij

just the last line i did

[mortal hare]

still one clause vs two

[brave sparrow]

But there’s no error possible

Which is an important distinction

[mortal hare]

yes, it wouldnt fail because its checking the same class type its overriding

but i think the second version is a bit, BIT faster

[brave sparrow]

I mean it’s doing the same thing under the hood

You’re not bypassing the null check

[olive lance]

I basically am just trying to make an unordered pair

[mortal hare]

but by using instanceof you can prevent errors due to how instanceof is checked at compile time

but this is not important here

[brave sparrow]

You could base the order of the hashcode on the order of the elements when sorted

[olive lance]

true

I think instead of 2 variables i will just have a set

and make sure it only has 2 values

[brave sparrow]

That’s overkill if you’re using a fixed 2 elements

You’re better off using 2 fields like you are currently

[olive lance]

i wish java had a data type for this

[lost matrix]

I dont... What do you need that for?
That just sounds like you should use Sets. Those are basically unordered bags.

[brave sparrow]

Sets are for many elements, it’s a waste if you’re only ever gonna have two

[olive lance]

Right but a set with only 2 elements. an "UnorderedPair" we can call it

def should be a thing

[waxen plinth]

Map.Entry

lol

If they're the same type then you could use an array size 2

If they're not you could use a record

[brave sparrow]

That’s ordered

[waxen plinth]

Okay why do they specifically need to be unordered

[brave sparrow]

They’re saying they want an object such that (a, b) = (b, a)

[waxen plinth]

Then store it in an array size 2 and sort on creation

[lost matrix]

So... a Set

[mortal hare]

i literally powered compiler explorer online too see which one is cheaper

https://i.imgur.com/ELWs6uE.png

[waxen plinth]

Yeah lol

You could just do Set.of(a, b)

[mortal hare]

instanceof is cheaper in terms of bytecode operations

unless i did something wrong

[brave sparrow]

Because it’s not going into what instanceof is doing

Lol

Instanceof has to get broken down into those steps eventually

[brave sparrow]

Yes, but without the additional set memory and overhead presumably

[gloomy arch]

What’s the overhead?

[brave sparrow]

Creating the set and the backing hashmap with its buckets

[mortal hare]

yes , but its broken down by jvm internally since its a separate bytecode operation rather by multiple bytecode operations

which should be in theory still cheaper

[brave sparrow]

At that point it’s basically a micro optimization though

[mortal hare]

haha

I WON

[brave sparrow]

Lmao

Premature optimization is the root of all evil

[mortal hare]

https://tenor.com/view/go-to-sleep-bed-gif-20506297

i know

i was just curious if i was right

lol

i still might be wrong tho

it depends on jvm

[lost matrix]

Using Class == Class odes not yield the same result as instanceof. You should
always use instanceof in equality checks.

[olive lance]

Ok well I guess im just gonna use a Set

[lost matrix]

Disregarding the performance.

[brave sparrow]

That’s true, assuming you want to support inheritance

[lost matrix]

I honestly smell xy

[olive lance]

Yeah i think its coming from the other room

Ok well ill go way back then to the main problem

got a factions plugin. i keep a list of factions and a map of players that are in factions and their faction

want to make alliances and heres where im at https://paste.md-5.net/baxidihuro.java

bad design?

[rapid shale]

Hy

[olive lance]

And here is how I check for legal actions https://paste.md-5.net/ezedevobus.cs

which is the main thing alliances pertain to

[gloomy arch]

If it’s always just two factions, you could just have two class variables faction1 and faction2

[brave sparrow]

And now we’re back where we started

Lol

[lost matrix]

This is the typical problem you also get when doing friendlists for example.
Who is in charge of handling this cross reference data.

[brave sparrow]

Use a graph @olive lance

Google has a lib for it

[lost matrix]

And as alex stated: A graph is the perfect tool for relationships of that type.
Each node represent a faction.

[olive lance]

Im reading about them rn

this is quite the data type

[ancient jackal]

Whatever I do, I just cannot get an instance of another plugin [10:05:14] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to PlotsForRanks v0.8-SNAPSHOT java.lang.ClassCastException: class sh.okx.rankup.RankupPlugin cannot be cast to class sh.okx.rankup.RankupPlugin (sh.okx.rankup.RankupPlugin is in unnamed module of loader 'Rankup-3.13.2.jar' @69b4a744; sh.okx.rankup.RankupPlugin is in unnamed module of loader 'plotsForRanks-0.8-SNAPSHOT.jar' @f83dd35) at me.grovre.plotsforranks.PlotsForRanks.getRankupPlugin(PlotsForRanks.java:41) ~[plotsForRanks-0.8-SNAPSHOT.jar:?]

and it's come to the point it's telling me this

public static RankupPlugin getRankupPlugin() {
        return (RankupPlugin) getPlugin().getServer().getPluginManager().getPlugin("Rankup");
    }```

[lost matrix]

Because you shade the other plugin in. Dont do that. scope -> provided

[ancient jackal]

scope -> provided?

[lost matrix]

How do you get the other plugin on your classpath?

Do you use maven/gradle?

[ancient jackal]

I use maven

[lost matrix]

Show your pom dpendencies

[ancient jackal]

        <dependency>
            <groupId>org.spigotmc</groupId>
            <artifactId>spigot-api</artifactId>
            <version>1.18.1-R0.1-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.palmergames.bukkit.towny</groupId>
            <artifactId>towny</artifactId>
            <version>0.97.5.15</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>okx-code</groupId>
            <artifactId>Rankup3</artifactId>
            <version>3</version>
        </dependency>
    </dependencies>

[lost matrix]

Rankup3 needs to have a "provided" scope

[ancient jackal]

what do you mean by that?

[lost matrix]

Look at your other dependencies

[ancient jackal]

it's in its own dependency

oh

I see, thank you

[stray crescent]

Items dissapear like after 2 minutes on ground

I don't have clearlag or any plugin for that

they jsut dissapear quicker than usual

how do I changed the it to 10 minutes on like paper cause I guess thats what it is

[karmic grove]

does anyone have the link for the guide spigot forum i remember it but cant seem to find it now

[tender shard]

what the

heck is wrong with towny

0.97.5.15

lmao

[ancient jackal]

It’s the version a server uses for some reason

But it should work with. Erosions moving forward

Versions

It just listens for players joining, joining towns, leaving towns, and ranking up

And adds bonus blocks based on what happens

[daring lark]

how could i check if player is holding fishing rod in left or right hand?

[young knoll]

Check both hands for Material.FISHING_ROD

[daring lark]

not working

[young knoll]

?notworking

[undone axle]

"Does not working" is a useless statement. Please describe what exactly is not working, what you expect it to do, and what actually happens. If you get any console errors, also ?paste the entire stacktrace.

[daring lark]

if(p.getInventory().getItemInMainHand().equals(Material.FISHING_ROD)) {
fortune = (p.getInventory().getItemInMainHand().getItemMeta()).getEnchantLevel(Enchantment.LUCK);
}

[young knoll]

getType

Itemstack is not a material

[daring lark]

when i'm using Material.etc it's just skipping the code

[young knoll]

.

[low temple]

p.getInventory().getItemInMainHand().equals(Material.FISHING_ROD) -> p.getInventory().getItemInMainHand().getType().equals(Material.FISHING_ROD)

[daring lark]

i'll try

thanks

it's working

[young knoll]

Technically you should also switch .equals to ==

But it’s not the end of the world

[stray crescent]

Does anybody know a plugin were I can have a tellraw/broadcast being sent in chat for everybody every 10 minutes?

For instance having "Join our discord blabla"

[young knoll]

There’s gotta be tons of auto broadcast plugins

?google

[undone axle]

Google your question before asking it:
https://www.google.com/

[stray crescent]

I just dont know what to search for

I did that i just got a thread of someone wanting to make a plugin like that

Sending me google isn't gonna help when I literally asked if you knew a plugin

[river oracle]

#help-server this is help-development we are assuming your making the plugin lol.

[young knoll]

Spigot auto broadcast plugin

[low temple]

https://www.spigotmc.org/resources/auto-broadcast-rehauled-for-1-8-1-15.28230/

prob works

[river oracle]

doesn't essentials have something like that

[stray crescent]

ye thx

[young knoll]

Essentials didn’t have that last I recall

Surprisingly

But maybe it does now

[river oracle]

this is a big plugin, but it has lots of server management stuff. It allows scheduling broadcasts etc. If your looking for tons of tiny stuff this might be the way to go as you can disable modules. I've used it for a while now its pretty nice
https://www.spigotmc.org/resources/servertools-➜-modular-server-management-1-8-1-18-1-open-source.95853/updates

[sharp flare]

Only tried CMI, paid but works

[young knoll]

That’s very overkill for an auto broadcast

[sharp flare]

Can replace essentials itself

[river oracle]

he's been asking about a lot of small stuff recently so I thought I'd send something over

[young knoll]

https://www.google.ca/search?q=auto+broadcast+plugin+site:www.spigotmc.org

[worldly ingot]

almost guarantee you there's one called "autobroadcast"

lol

Man I shoulda put money on that shit. First result.
https://www.spigotmc.org/resources/autobroadcast.69377/

[young knoll]

Apparently you have to use mini-message formatting

[vague swallow]

How can I add a custom texture to my SkullMeta?

[young knoll]

Version?

[vague swallow]

1.18

[young knoll]

https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/inventory/meta/SkullMeta.html#setOwnerProfile(org.bukkit.profile.PlayerProfile)

[vague swallow]

thanks man

.setOwnerProfile() is not available. Just .setOwner()

[young knoll]

Update spigot

[vague swallow]

I'm using paper

[young knoll]

Talk to paper then

[vague swallow]

alr

[stray crescent]

im using stone

[vague swallow]

okay...

but yk I won then

[stray crescent]

Does anybody know a plugin that let's me run a command when're at a specific coordinate

[quaint mantle]

that would be extremely non-performant

unless you're not checking every tick

[young knoll]

Meh

PlayerMoveEvent has been used for more

[quaint mantle]

lets log to the console whenever a player moves

[young knoll]

Okay

[stray crescent]

There is no music that allows for regional music with music discs. So I'm trying to do

/playsound minecraft:music_disc.otherside music <p>

whenever you enter a store, and when u leave it will do /stopsound <p>

[young knoll]

Worldguard extra flags has entry and exit commands

I think

[stray crescent]

wow

ur right

holy damn

[vague swallow]

Does anyone here know how to change the texture of a SkullMeta?

1.18

[stray crescent]

@young knoll

playsound <sound> <source> <targets> [<pos>] [<volume>] [<pitch>] [<minVolume>]

how would I skip a string?

after <sound> <source> <targets>

I just want to put in volume

so how would I skip "pos"

cause it wants me to fill in pos

as for the next stream after target obviously

[ancient jackal]

https://hub.spigotmc.org/javadocs/spigot/org/bukkit/inventory/meta/SkullMeta.html#setOwnerProfile(org.bukkit.profile.PlayerProfile)

[young knoll]

I don’t know if you can

Maybe just do ~ ~ ~

I think a sound needs to have a location

[stray crescent]

ahh yes

thanks

[lofty fern]

So, not sure if I am dumb or something. But I am new to plugin development and want to make a plugin where the player goes like "/show add firework [type] [color] [effect]" I think I know how to do that part but right now I am trying to work on grabbing the players location and writing it down on some document so that the plugin can go back later and grab that data. However I cant seem to find a proper way of grabbing a players location (using coordinates) or finding a way of putting that on some sort of document (preferably txt) if you know of any tutorials or know of a way of doing this help is appreciated.

[vague swallow]

for some reason there is no ".setOwnerProfile()"

[young knoll]

Make sure you are up to date

Like I said

Why did you

[sterile token]

Every class should be final class right? If not people will be able to extend the class

[young knoll]

You know you can just set location directly

[sterile token]

you can directly save the loation with: cfg.set("location". loc);

[vague swallow]

I'm using spigot now. But how can I update it with IntelliJ? (Sorry I'm new too)

[sterile token]

Wait what?

[young knoll]

Maven or gradle?

[lofty fern]

Did someone answer my question? I saw a ping but dont see me being pinged here.

[vague swallow]

earlier I was using aper

[vague swallow]

*paper

[sterile token]

Ahh

You didnt change your IDE

You change the api

[vague swallow]

I tried but it was shit what I said, sorry

[sterile token]

For developing on spigot you have the ?jd

[sterile token]

Which is your problem? I will try to help you

[lofty fern]

this is it

[lofty fern]

lol, you good.

[sterile token]

What your inssue?

[lofty fern]

go to the reply of this reply

[vague swallow]

I just gave him the code of my /spawn plugin. But it was not what he wants

[sterile token]

Your idea for saving its the worst. You should save data on yaml or json files

[lofty fern]

How would I write to a yaml? Didn't think about that.

[young knoll]

Spigots config API can handle location directly

[lofty fern]

But can it call back on that location at a later date if a user leaves that location.

[young knoll]

Yes

[lofty fern]

So how would you store that?

[sterile token]

You can use* my own FileHandler, its based on Spigot ones. And it make really easy the usage/managment of yaml files

[vague swallow]

Okay. And how can I update it now? With IDEA IntelliJ?

[young knoll]

YanlConfiguration#set(“key”, location)

[sterile token]

I help him dont worry

I will sent you a class, please add it to your project

And then i explain how it works

[young knoll]

Yes a third party class to save a location

Very necessary

[lofty fern]

You made one or the name is "FileHandler"?

[sterile token]

I make a FileHandler, called FileHandler

[lofty fern]

Gotcha.

[sterile token]

Itself its a FileHandler, because it help you to manage files

[lofty fern]

New to this all. First day coding so the overall goal is to make a show plugin that can syncronize things to openaudioMC but I am working on each individual command one at a time.

[sterile token]

If you are new* i straigth recommend a lot learning about the SpigotAPI and Java API

[delicate lynx]

literally just make a FileConfiguration and tell it to add a new key with the location, then call the save function on it

[young knoll]

?learnjava

[undone axle]

Here are some links to get you started on learning Java:

• https://www.codecademy.com/learn/learn-java
• https://www.sololearn.com/learning/1068
• https://www.learnjavaonline.org/
• https://programmingbydoing.com/
• https://docs.oracle.com/javase/tutorial/java/index.html

The last one is the only official one, however some of those concepts assume that you already know a bit about programming.

[delicate lynx]

no need for this extra class

[young knoll]

It takes like, 5 lines to do it with the existing API

[sterile token]

I know but if you wanna manage multiple Files, for me it a mess. That why i use my own FileHandler

[lofty fern]

This would be great if it was set in stone but I want the thing to be able to make a file on the spot so players can create shows in game.

[young knoll]

Clearly that’s way too many

[sterile token]

?afk eating

[lofty fern]

Yea if you could send it to me and explain it I would be greatful.

[sterile token]

Allright i will be eating, prob im back in 10-15m

[vague swallow]

?learnspigot

F @vague swallow

[sterile token]

?jd

[undone axle]

Spigot: https://hub.spigotmc.org/javadocs/spigot
BungeeCord: https://ci.md-5.net/job/BungeeCord/ws/api/target/apidocs/index.html
BungeeCord Chat: https://javadoc.io/doc/net.md-5/bungeecord-chat/latest/index.html

[sterile token]

Go ahead

[vague swallow]

ty

[lofty fern]

So I guess when he gets back from AFK he will send me it or do I need someone else to help me with this?

[young knoll]

I mean

Just create a file with the Java API, and then use YamlConfiguration.loadConfiguration(file)

[lofty fern]

Can the plugin create it based off an arg a player said in chat or do I have to make that manually?

I want each show to haves its own file.

[young knoll]

Sure why not

[lofty fern]

How would I go about doing that?

[young knoll]

Learn the java file API

https://docs.oracle.com/javase/8/docs/api/java/nio/file/Files.html

JavaPlugin#getDataFolder will be useful as well

[lofty fern]

So if a player runs a command like "/show create [arg1]"
then java will create a file with the name of the arg1 with what I tell it to put in the file?

[young knoll]

Mhm

[lofty fern]

Sweet. Thanks. My dad is a java developer and luckily works from home and being home schooled I can easily get him to help me with java API.

[young knoll]

https://hub.spigotmc.org/javadocs/spigot/org/bukkit/configuration/file/YamlConfiguration.html

Is the spigot class you’ll want to use

[lofty fern]

@young knoll second thing, how can I store the coordinates of a player in this file? I want the players coords and not spigot stuff. Any way of doing that?

Like how do you get player coords.

So many spigot documentation to go through and when I search "coordinates" can't find anything.

[young knoll]

Player.getLocation

[lofty fern]

Will that give all the x, y, and z, or do I need to specifically do "Player.getY()" "Player.getX()" "Player.getZ()"

[young knoll]

It will give X Y Z pitch yaw and world

[sterile token]

?jd

[undone axle]

Spigot: https://hub.spigotmc.org/javadocs/spigot
BungeeCord: https://ci.md-5.net/job/BungeeCord/ws/api/target/apidocs/index.html
BungeeCord Chat: https://javadoc.io/doc/net.md-5/bungeecord-chat/latest/index.html

[sterile token]

Please read the javadocs

Javadocs are the documention