Mongodb doesn t connect to my cluster in spring boot | Together Java | Page 1

coral mirage Jan 29, 2026, 1:41 PM

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Mongodb doesn t connect to my cluster in spring boot instead is connecting to my local cluster 27017

open deltaBOT Jan 29, 2026, 1:41 PM

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<@&987246584574140416> please have a look, thanks.

coral mirage Jan 29, 2026, 1:43 PM

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here is what spring boots reports:

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com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.internal.connection.SocketStream.lambda$open$0(SocketStream.java:85) ~[mongodb-driver-core-5.6.2.jar:na]
    at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na]
    at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:85) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:233) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.setupNewConnectionAndGetInitialDescription(DefaultServerMonitor.java:282) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.lookupServerDescription(DefaultServerMonitor.java:253) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.run(DefaultServerMonitor.java:203) ~[mongodb-driver-core-5.6.2.jar:na]
Caused by: java.net.ConnectException: Connection refused
    at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:547) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:602) ~[na:na]
    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na]
    at java.base/java.net.Socket.connect(Socket.java:633) ~[na:na]
    at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:76) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.SocketStream.initializeSocket(SocketStream.java:104) ~[mongodb-driver-core-5.6.2.jar:na]```

open deltaBOT Jan 29, 2026, 1:43 PM

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coral mirage ```2026-01-29T15:42:15.614+02:00 INFO 10173 --- [backend] [localhost:27017] org...

Detected code, here are some useful tools:

[WARNING] The code couldn't end properly...

Problematic source code:

2026-01-29T15:42:15.614+02:00  INFO 10173 --- [backend] [localhost:27017] org.mongodb.driver.cluster               : Exception in monitor thread while connecting to server localhost:27017

com.mongodb.MongoSocketOpenException: Exception opening socket
    at com.mongodb.internal.connection.SocketStream.lambda$open$0(SocketStream.java:85) ~[mongodb-driver-core-5.6.2.jar:na]
    at java.base/java.util.Optional.orElseThrow(Optional.java:403) ~[na:na]
    at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:85) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:233) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.setupNewConnectionAndGetInitialDescription(DefaultServerMonitor.java:282) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.lookupServerDescription(DefaultServerMonitor.java:253) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitor.run(DefaultServerMonitor.java:203) ~[mongodb-driver-core-5.6.2.jar:na]
Caused by: java.net.ConnectException: Connection refused
    at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:547) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:602) ~[na:na]
    at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na]
    at java.base/java.net.Socket.connect(Socket.java:633) ~[na:na]
    at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:76) ~[mongodb-driver-core-5.6.2.jar:na]
    at com.mongodb.internal.connection.SocketStream.initializeSocket(SocketStream.java:104) ~[mongodb-driver-core-5.6.2.jar:na]```
Cause:
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## System out
[Nothing]

coral mirage Jan 29, 2026, 1:45 PM

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my aplication.proprierties:

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spring.application.name=backend
server.port=7777
spring.data.mongodb.database=nutripro
spring.mongodb.embedded.storage.enabled=false```

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and my connection in java:

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private final UserRepo ur;

    public backend(UserRepo ur){
        this.ur = ur;
    }
@GetMapping("/nume/{name}")
    public String connectToDB(@PathVariable String name){
        return ur.findByName(name).map(User::getName)
                .orElse("Nu exista in Data Base");
    }```

umbral carbon Jan 29, 2026, 1:55 PM

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Hi @coral mirage , you have not told us the version of Spring Boot you are using and what libraries are included for your connection. This is an important detail but since you are using Spring Boot, I will assume you are using spring-boot-starter-data-mongodb.

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The application.properties file should follow this similar format: ```
spring.mongodb.host=mongoserver1.example.com
spring.mongodb.port=27017
spring.mongodb.additional-hosts[0]=mongoserver2.example.com:23456
spring.mongodb.database=test
spring.mongodb.username=user
spring.mongodb.password=secret

coral mirage Jan 29, 2026, 1:56 PM

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umbral carbon Hi <@1021017797423272079> , you have not told us the version of Spring Boot you ...

yea, sorry! The spring boot version is 4.02

umbral carbon Jan 29, 2026, 1:56 PM

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The documentation link is here: https://docs.spring.io/spring-boot/reference/data/nosql.html#data.nosql.mongodb

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I think spring.mongodb.embedded.storage.enabled is incorrect and also a Spring Boot version 2 configuration.

coral mirage Jan 29, 2026, 2:02 PM

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umbral carbon The documentation link is here: https://docs.spring.io/spring-boot/reference/dat...

omg, thank you

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so I watched this doc at the time but I didn t pay mush attention on this spring.data.mongodb.uri

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so in doc is without .data

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and now it s working!

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THank you!

umbral carbon Jan 29, 2026, 2:04 PM

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No problem, happy it's working!

#Mongodb doesn t connect to my cluster in spring boot

[WARNING] The code couldn't end properly...