Gradle8.8 RC1 Still Not Support JDK22? about gradle

[win301]

@ov7a I see. Thank you very much for your reply. It turned out to be a problem with Springboot, but I always thought it was a problem with Gradle. I adopted this method and successfully resolved the issue of bootJar running an error。

This can be worked around by configuring the application's main class name:

springBoot {
mainClass = 'com.example.ExampleApplication'
}

Because I am using gradle kotlin, the code above is written in this way

tasks.bootJar {
mainClass="com.example.ExampleApplication"
// other config code
}

[whydoievenneedthis]

I have the same error, and it finishes up with this message:

Unsupported Gradle JVM.

Your build is currently configured to use Java 22.0.1 and Gradle 8.8-rc-1.

Possible solutions:
 - Use Java 21 as Gradle JVM: Open Gradle settings
 - Upgrade to Gradle 8.5 and re-sync

Interestingly enough, when I run the test suite it works fine -- once:

> Task :compileJava
Note: C:\xxx.java uses preview features of Java SE 22.
Note: Recompile with -Xlint:preview for details.
> Task :processResources UP-TO-DATE
> Task :classes
> Task :compileTestJava
Note: C:\yyy.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\zzz.java uses preview features of Java SE 22.
Note: Recompile with -Xlint:preview for details.

When I try to re-run the test suite a second time, I get a "Test events were not received" message, and this persists until I switch back to Java 21.

[ov7a]

We appreciate the effort, but we must ask for more information so that we can triage it.

We do not see an immediate root cause, and we need a minimal reproducible example for the triage. If we have a reproducer, we may be able also to suggest workarounds or ways to avoid the problem.

The ideal way to provide a reproducer is to leverage our reproducer template. You can also use Gradle Project Replicator to reproduce the structure of your project.

This issue will be closed after 7 days unless you provide more information.

---

There are multiple moving parts here.

1. Spring boot gradle plugin. Does the version you are using support running on Java 22?
2. Intellij support. Does the version you are using support integration with Gradle 8.8-rc-1?

In any case, please provide a reproducer for your issue.

[win301]

@ov7a I have attached a demo of Springboot for you, which uses the gradle-8.8-rc-1 version. The version of Springboot is the latest preview version, version 3.3.0 RC1 (of course, using the latest official version 3.2.5, the result is the same). Both versions of Springboot support JDK22, and the Intellij idea version I am currently using is 2024.1, which is also the latest version.
sprinboot-3.3.0 (RC1).zip

[ov7a]

The stacktrace

...
Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 66
        at org.springframework.asm.ClassReader.<init>(ClassReader.java:199)
        at org.springframework.asm.ClassReader.<init>(ClassReader.java:180)
        at org.springframework.asm.ClassReader.<init>(ClassReader.java:166)
        at org.springframework.asm.ClassReader.<init>(ClassReader.java:287)
        at org.springframework.boot.loader.tools.MainClassFinder.createClassDescriptor(MainClassFinder.java:254)
        at org.springframework.boot.loader.tools.MainClassFinder.doWithMainClasses(MainClassFinder.java:136)
        at org.springframework.boot.loader.tools.MainClassFinder.findSingleMainClass(MainClassFinder.java:109)
...

indicates that it's a Spring issue.

See these issues for more details:

• spring-projects/spring-boot#40074
• spring-projects/spring-boot#40573