spotless-maven-plugin version 2.38.0 failing on JDK 21 RC1 (EA-35)

[khmarbaise]

Environment:

$> mvn --version
Apache Maven 3.9.4 (dfbb324ad4a7c8fb0bf182e6d91b0ae20e3d2dd9)
Maven home: /Users/khm/tools/maven
Java version: 21, vendor: Oracle Corporation, runtime: /Users/khm/.sdkman/candidates/java/21.ea.35-open
Default locale: en_DE, platform encoding: UTF-8
OS name: "mac os x", version: "13.4.1", arch: "aarch64", family: "mac"

Spotless Maven Plugin Version 2.38.0 (instead of 2.37.0 overwritten via manual change in the pom.xml file):
Summary:
Building the Maven source code itself (apache/maven@7d66d19) will result in the following:

[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.diffplug.spotless:spotless-maven-plugin:2.38.0:check (default) on project maven-api-meta: Execution default of goal com.diffplug.spotless:spotless-maven-plugin:2.38.0:check failed: An API incompatibility was encountered while executing com.diffplug.spotless:spotless-maven-plugin:2.38.0:check: java.lang.NoSuchMethodError: 'com.sun.tools.javac.tree.JCTree com.sun.tools.javac.tree.JCTree$JCImport.getQualifiedIdentifier()'
[ERROR] -----------------------------------------------------

MacOS/Linux

The configuration block(inherited from our parent (maven-parent version 40):

        <plugin>
          <groupId>com.diffplug.spotless</groupId>
          <artifactId>spotless-maven-plugin</artifactId>
          <version>2.37.0</version>
          <configuration>
            <java>
              <!-- orders of used formatters are important MPOM-376 -->
              <!-- eg. palantir override importOrder, so should be first -->
              <palantirJavaFormat />
              <removeUnusedImports />
              <importOrder>
                <file>config/maven-eclipse-importorder.txt</file>
              </importOrder>
              <licenseHeader>
                <file>config/maven-header-plain.txt</file>
              </licenseHeader>
            </java>
            <pom>
              <sortPom>
                <expandEmptyElements>false</expandEmptyElements>
                <!-- https://issues.apache.org/jira/browse/MRELEASE-1111 -->
                <spaceBeforeCloseEmptyElement>true</spaceBeforeCloseEmptyElement>
              </sortPom>
            </pom>
            <upToDateChecking>
              <enabled>true</enabled>
            </upToDateChecking>
          </configuration>

The full stack trace:

[INFO] Index file does not exist. Fallback to an empty index
[DEBUG] Allocating an additional FeatureClassLoader for key=com.diffplug.spotless.JarState@64dcfd09 Cache.size was 1
[ERROR] Step 'palantir-java-format' found problem in 'src/main/java/org/apache/maven/api/annotations/Nonnull.java':
'com.sun.tools.javac.tree.JCTree com.sun.tools.javac.tree.JCTree$JCImport.getQualifiedIdentifier()'
java.lang.NoSuchMethodError: 'com.sun.tools.javac.tree.JCTree com.sun.tools.javac.tree.JCTree$JCImport.getQualifiedIdentifier()'
    at com.palantir.javaformat.java.RemoveUnusedImports.getSimpleName (RemoveUnusedImports.java:245)
    at com.palantir.javaformat.java.RemoveUnusedImports.buildReplacements (RemoveUnusedImports.java:225)
    at com.palantir.javaformat.java.RemoveUnusedImports.removeUnusedImports (RemoveUnusedImports.java:209)
    at com.diffplug.spotless.glue.pjf.PalantirJavaFormatFormatterFunc.apply (PalantirJavaFormatFormatterFunc.java:42)
    at com.diffplug.spotless.FormatterFunc.apply (FormatterFunc.java:32)
    at com.diffplug.spotless.FormatterStepImpl$Standard.format (FormatterStepImpl.java:82)
    at com.diffplug.spotless.FormatterStep$Strict.format (FormatterStep.java:103)
    at com.diffplug.spotless.Formatter.compute (Formatter.java:246)
    at com.diffplug.spotless.PaddedCell.calculateDirtyState (PaddedCell.java:203)
    at com.diffplug.spotless.PaddedCell.calculateDirtyState (PaddedCell.java:190)
    at com.diffplug.spotless.maven.SpotlessCheckMojo.process (SpotlessCheckMojo.java:54)
    at com.diffplug.spotless.maven.AbstractSpotlessMojo.execute (AbstractSpotlessMojo.java:229)
    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)
[INFO] ------------------------------------------------------------------------

If you need more information please state so I can help.

[jvissers]

Check: #1774

[nedtwigg]

• Should be fixed in next release Fix Java 21 compatibilities #1920