terminal instantly quits even though JRE is installed

[untold osprey]

@shrewd junco can you take a look here please

[tender zephyr]

<@&987246399047479336> please have a look, thanks.

[tender zephyr]

While you are waiting for getting help, here are some tips to improve your experience:

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Don't forget to close your thread using the command </help-thread close:1027500463647621170> when your question has been answered, thanks.

Here is an AI assisted attempt to answer your question 🤖. Maybe it helps! In any case, a human is on the way 👍. To continue talking to the AI, you can use </chatgpt:1108714622413963314>.

I'm sorry, but as a language model AI, I cannot directly access your computer or view any specific code or terminal output. However, I can try to provide some general troubleshooting steps that might help you resolve the issue.

1. Make sure you have the latest version of Java Runtime Environment (JRE) installed on your system. You can download it from the official Oracle website.

2. Check if your system's environment variables are correctly set up for Java. Ensure that the "JAVA_HOME" variable points to the correct JRE installation directory and that the "PATH" variable includes the path to the Java bin directory.

3. If you are running a Java program from the command line, make sure you are using the correct command to execute it. The standard command is "java <ClassName>" where <ClassName> is the name of your Java class containing the main method.

4. Check if there are any error messages displayed in the terminal before it quits. These messages can provide valuable information about what might be causing the issue.

5. If possible, try running your Java program on a different machine or with a different JRE installation to see if it works correctly there. This can help identify if there is an issue with your specific setup.

If none of these steps resolve your problem, please provide more specific details about your environment, any error messages received, and any relevant code snippets so that others may be able to assist you further.

[untold osprey]

I tested my app in another pc, I ran it through batch file and through command line but it just instantly quits

however it works fine on my machine

@shrewd junco would really like it if you could help me out

[shrewd junco]

i can't help u if u don't provide any info to work with

neither can others

[untold osprey]

i can post the code here, (its really small)

[shrewd junco]

let the user start it in terminal and report back the error messages that are shown in the terminal

and share the file

[untold osprey]

there is no error, the window opens and closes instantly

[shrewd junco]

the error is in the command line window

that's why im saying to start it from there

and not double click

[untold osprey]

thats what i did, i ran it from the command line not the batch file

should i share the code?

[warm lichen]

it's because your program is exiting after it's finished running

[untold osprey]

it works on my computer tho

[warm lichen]

the only other time this happens is if there's no java found/wrong version

[shrewd junco]

and what does it say in the command line? nothing? does it close before u can read anything?
also, still waiting for the file

[untold osprey]

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;


public class Server implements Serializable
{
    public static void main(String[] args) throws IOException
    {
        ServerSocket serverSocket = new ServerSocket(Integer.parseInt(args[0]));

        System.out.println("Waiting for client ");
        Socket socket = serverSocket.accept();
        System.out.println("Client connected");


        BufferedReader socketReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        while (true) {
            float num = Float.parseFloat(socketReader.readLine());
            System.out.println(num + " doubled is: " + num * 2);
        }
    }
}

[tender zephyr]

Detected code, here are some useful tools:

Formatted code

import java.io. * ;
import java.net.ServerSocket;
import java.net.Socket;

public class Server implements Serializable {
  public static void main(String[] args) throws IOException {
    ServerSocket serverSocket = new ServerSocket(Integer.parseInt(args[0] ));
    System.out.println("Waiting for client ");
    Socket socket = serverSocket.accept();
    System.out.println("Client connected");
    BufferedReader socketReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    while (true) {
      float num = Float.parseFloat(socketReader.readLine());
      System.out.println(num + " doubled is: " + num * 2);
    }
  }
}

[warm lichen]

@echo off
java -jar <jar> <args>
pause
``` if you save this as a .bat the cmd window still stay open

[untold osprey]

one sec

[untold osprey]

it still closes and all i am left with is a window saying press any key to continue

[warm lichen]

just to be sure, you replaced <jar> <args> right?

and java -version shows something?

[untold osprey]

btw here is the client code, the server interacts with it

import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import java.util.concurrent.ThreadLocalRandom;

public class Client
{
    private static ArrayList<Socket> sockets = new ArrayList<>();

    public static void main(String[]args) throws IOException
    {
        sockets.add(new Socket("localhost", 9001));
        sockets.add(new Socket("localhost", 9002));
        sockets.add(new Socket("localhost", 9003));

        BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));

        while (true)
        {
            System.out.println("Enter a number: ");

            float num = Float.parseFloat(inputReader.readLine());

            Integer socketIndex = ThreadLocalRandom.current().nextInt(0, sockets.size());

            CallServer(socketIndex, num);
        }
    }

    private static void CallServer(Integer socketIndex, Float numberToDouble) throws IOException
    {
        PrintWriter socketWriter = new PrintWriter(sockets.get(socketIndex).getOutputStream(), true);

        socketWriter.println(numberToDouble);
    }

}

[tender zephyr]

Detected code, here are some useful tools:

Formatted code

import java.io. * ;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import java.util.concurrent.ThreadLocalRandom;

public class Client {
  private static ArrayList<Socket> sockets = new ArrayList<>();
  public static void main(String[] args) throws IOException {
    sockets.add(new Socket("localhost", 9001));
    sockets.add(new Socket("localhost", 9002));
    sockets.add(new Socket("localhost", 9003));
    BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));
    while (true) {
      System.out.println("Enter a number: ");
      float num = Float.parseFloat(inputReader.readLine());
      Integer socketIndex = ThreadLocalRandom.current().nextInt(0, sockets.size());
      CallServer(socketIndex, num);
    }
  }
  private static void CallServer(Integer socketIndex, Float numberToDouble) throws IOException {
    PrintWriter socketWriter = new PrintWriter(sockets.get(socketIndex).getOutputStream(), true);
    socketWriter.println(numberToDouble);
  }
}

[untold osprey]

yeah

[untold osprey]

how do you mean

[warm lichen]

hang on - is this for the client or server ur getting the issue?

[untold osprey]

well i am supposed to open 3 instances of server first

[warm lichen]

<jar> needs to be replaced with the name of your jar and <args> should be any args you need (if null)

[untold osprey]

client without 3 servers open is supposed to crash

[untold osprey]

yeah i had it before

[warm lichen]

which one is not loading though, the server or clients?

[untold osprey]

i just added the echo and pause

[untold osprey]

server

i am supposed to open the server first

[warm lichen]

show the .bat?

[untold osprey]

1 sec

well i changed it on the other computer

on this one it worked fine as it was

but it would be this

@echo off
start java -jar server.jar 9001
pause

[warm lichen]

remove start

the only other thing I can think of right the top of my head is that your jar is probably wrong?

[untold osprey]

ohh yeeh now i get the error

i cant copy paste here but

it says

[warm lichen]

ss is fine

[untold osprey]

Server has been commpiled by a more recent version of the Java runtime

[warm lichen]

okay great we have the issue

[untold osprey]

this version of java runtime only recognizes class file version up to 5 whatever whatever

[warm lichen]

you have the wrong jre installed on your system

[untold osprey]

i literally installed the most recent one

i just installed it

[warm lichen]

what's the output of java --version

[untold osprey]

java -version you mean?

[warm lichen]

yeah myb

[untold osprey]

java version 1.8.0_381

[warm lichen]

yeah that's java 8 not the latest

[untold osprey]

along with someo ther lines

[warm lichen]

java 8 is class version 52

[untold osprey]

but i just installed it from the website

[warm lichen]

java.com?

that has java 8 ;p

[untold osprey]

yeah

java.com

[tender zephyr]

Eclipse Adoptium provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure. Supported platforms include Linux, macOS, Windows, ARM, Solaris, and AIX.

https://adoptium.net

wazei • used /tag id: adoptium · Oct 1, 2023, 3:23 PM

Home | Adoptium

Eclipse Adoptium provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure. Supported platforms include Linux, macOS, Windows, ARM, Solaris, and AIX.

Download latest Java from https://adoptium.net/, run the installer.

Open a CMD and type java -version and javac -version, if both show your new Java version, you have successfully installed Java! 🎉
https://i.imgur.com/CurMujt.png

In order to prevent issues with old installations you may want to remove them. Type where java and where javac. They should only show the new and no old entries:
https://i.imgur.com/x5k1GxG.png

If that is not the case, you may want to clean up. Therefore, type "environment variable" into the Windows search and follow the dialog. You will see two entries for a variable called Path, one for your user and one for the system. This variable tells Windows where to look for commands, like java and javac.
https://i.imgur.com/3bN9QE2.png

Edit both. Make sure that they only list the entry to your new Java installation and remove all the old entries you have seen with the where command before:
https://i.imgur.com/JAYog1U.png

Confirm and close all dialogs. Restart your CMD window and try where java and where javac again. It should only list the new installation now and nothing else.

Congratulation, your Java is now finally ready, happy coding 🎉

wazei • used /tag id: install · Oct 1, 2023, 3:24 PM

Home | Adoptium

Eclipse Adoptium provides prebuilt OpenJDK binaries from a fully open source set of build scripts and infrastructure. Supported platforms include Linux, macOS, Windows, ARM, Solaris, and AIX.

[untold osprey]

so what should i download here

[warm lichen]

^ follow this

[untold osprey]

how do i remove the old ones exactly

[warm lichen]

control panel

uninstall program

[untold osprey]

cant i compile the program with older java? so it works for more ppl?

[warm lichen]

yeah the clients you should

usually with the server you can expect people to install the correct version to get it working

[untold osprey]

how would i compile with an older version

[warm lichen]

(since the server isn't normally something you give to end users) - in this case you can

how did you compile before?

[untold osprey]

i just exported the jar file from eclipse

[warm lichen]

ah rip you'll need to do some googling, i can't remember much about how to use eclipse

[untold osprey]

ah okay, also does this adoptium install thing work for any OS?

[warm lichen]

yeah

[untold osprey]

so there is 1 installer right?

[warm lichen]

yup

[untold osprey]

ah okay sweet let me try it out for the other pc

also how come removing the "start" fixed the error

i mean showed the error

[warm lichen]

i've never seen people use start

but i'm guessing, start is another application in windows

so it hides the output of the second program

by removing start you're directly calling the java program which is defined in your path

[untold osprey]

ah okay

ahaha now it doesnt work on my current machine

 LinkageError occurred while loading main class Server
        java.lang.UnsupportedClassVersionError: Server has been compiled by a more recent version of the Java Runtime (class file version 64.0), this version of the Java Runtime only recognizes class file versions up to 61.0

this happened after i installed adoptium

[warm lichen]

ah okay it's because you compiled using java 20

and class version 61 is java 17

https://adoptium.net/en-GB/temurin/releases/

under this section, choose 20

[untold osprey]

let me first see if i can compile with older version in eclipse

[warm lichen]

cool - gl - i'm heading out now

[untold osprey]

okay thanks a lot for your help