How to change maven java version

General
1

Hello,

I want to work on a Java Spring project, so I created a new project and chose the backend template for Java. The template uses Java 17 as default Java version, but I want to use Java 21.

So what I did is, I changed the pkgs.zulu17 to pkgs.zulu21 and also in the project.toml file I changed the value from 17 to 21. Of course I also changed the java.version in the pom.xml file to 21.

Now when I run mvn clean install I am getting this error message:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.13.0:compile (default-compile) on project x: Fatal error compiling: error: release version 21 not supported -> [Help 1]

And when I run mvn -v I can see, that maven is using Java version 19.0.2, so it is obvious why it is not working

Apache Maven 3.9.5 (57804ffe001d7215b5e7bcb531cf83df38f93546)
Maven home: /nix/store/sc5x4nm0rfwabs4wfdrn47fv8p1f1fwd-apache-maven-3.9.5/maven
Java version: 19.0.2, vendor: N/A, runtime: /nix/store/ikqzs5w9py247w4kvr6im2c2pbpdphnk-openjdk-19.0.2+7/lib/openjdk
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "6.1.85+", arch: "amd64", family: "unix"

But I really don’t know how I can change it, that maven is using Java version 21.
Can someone help me, please?
Thanks in advance!

2

In regard to my problem, I created this uservoice:

1 Like
3

Hi @ms-cosieu

To get java 21 it looks like you’ll need to switch your channel to "unstable" and just use pkgs.zulu

Screenshot 2024-07-10 at 11.25.54 AM
Screenshot 2024-07-10 at 11.25.54 AM2750Ă—1660 402 KB

NOTE It’s not recommended to use “unstable” channel as it will become incompatible. Important to keep your eye on the NixOS versioning, especially if any issues arise

1 Like
4

This worked! Thank you very much :slight_smile:

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