spring-boot-maven-plugin:3.1.5 is not compatible with JDK 22

[ZheSun88]

Hi,

I am testing a spring project with the latest JDK versions.
when running our spring app with JDK 22-ea, the build failed with the following error

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:3.1.5:repackage (repackage) on project latest-java: Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:3.1.5:repackage failed: Unsupported class file major version 66 -> [Help 1]

maven version: 3.9.5
java version: 22-ea

[wilkinsona]

We don't yet support Java 22 so problems like this are to be expected at the moment. In this case, if you re-run with -e as Maven recommends in its error message, you'll see that the error is coming from Spring Framework:

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:216)
    at org.springframework.boot.loader.tools.MainClassFinder.findSingleMainClass (MainClassFinder.java:197)
    at org.springframework.boot.loader.tools.Packager.findMainMethod (Packager.java:336)
    at org.springframework.boot.loader.tools.Packager.findMainMethodWithTimeoutWarning (Packager.java:325)
    at org.springframework.boot.loader.tools.Packager.getMainClass (Packager.java:320)
    at org.springframework.boot.loader.tools.Packager.addMainAndStartAttributes (Packager.java:300)
    at org.springframework.boot.loader.tools.Packager.buildManifest (Packager.java:285)
    at org.springframework.boot.loader.tools.Packager.write (Packager.java:201)
    at org.springframework.boot.loader.tools.Packager.write (Packager.java:194)
    at org.springframework.boot.loader.tools.Repackager.repackage (Repackager.java:132)
    at org.springframework.boot.loader.tools.Repackager.repackage (Repackager.java:119)
    at org.springframework.boot.maven.RepackageMojo.repackage (RepackageMojo.java:214)
    at org.springframework.boot.maven.RepackageMojo.execute (RepackageMojo.java:204)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
    at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
    at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
    at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
    at java.lang.reflect.Method.invoke (Method.java:580)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:283)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:226)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:407)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:348)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
    at java.lang.reflect.Method.invoke (Method.java:580)
    at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:52)
    at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:161)
    at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:73)

spring-projects/spring-framework#31459 is tracking Framework's Java 22 support.

[wilkinsona]

Please note that support for Java 22 and later will require Spring Framework 6.1 and, therefore, Spring Boot 3.2.

[krzyk]

@wilkinsona Sorry for resurrecting old issue, but spring boot 3.2.3 still has issues with JDK 22 - looks like the ASM should be upgraded in spring-boot-maven-plugin.

[wilkinsona]

@krzyk that shouldn't be the case as Spring Framework's embedded version of ASM (which is what Boot's Maven plugin uses) has supported Java 22 since the 6.1.0 milestones. Please open a new issue with a minimal sample that reproduces the problem and we can take a deeper look.

[krzyk]

Issue is not with spring per se, but with spring-boot-maven-plugin, I'll create issue, as it is easy to reproduce (just generate project from https://start.spring.io/ change java version to 22 and it fails)

Created #39927