[POC] Migrate to Java 21 - code

[Pankraz76]

[POC] Migrate to Java 21 - code

depends on:

• [POC] Migrate to Java 21 - infrastructure #2319

apply:

• https://docs.openrewrite.org/recipes/java/migrate/upgradetojava21

[Pankraz76]

Items:

• rework @Disabled("tmp-fix")

• 
• 

• [INFO] BUILD SUCCESS

• 

[Pankraz76]

is this any good?

[desruisseaux]

Does it needs to be synchronized with #2277 for avoiding overlaps and therefore, potential merge conflicts?

[Pankraz76]

good catch, thx.

[Bukama]

Rising the Maven version requires an official, succeeded vote.

[Pankraz76]

Rising the Maven version requires an official, succeeded vote.

is there an template? I wanted to pitch an similar Issue, buts its not allowed:

• Migrate to Java 21 checkstyle/checkstyle#16981

[gnodet]

We need a separate PR for bumping the required JDK to 21.
Other PRs can follow and be based on that one.

[gnodet]

We need a separate PR for bumping the required JDK to 21.
Other PRs can follow and be based on that one.

[Pankraz76]

We need a separate PR for bumping the required JDK to 21. Other PRs can follow and be based on that one.

• [POC] Migrate to Java 21 - infrastructure #2319

[Pankraz76]

item: ResourceNotFoundException: Could not find resource 'licenses/unrecognized.txt'. at remote-resources

[INFO] --- remote-resources:3.3.0:process (process-resource-bundles) @ apache-maven ---
[INFO] Preparing remote bundle org.apache.apache.resources:apache-jar-resource-bundle:1.7
[INFO] Copying 3 resources from 1 bundle.
[INFO] Filtering appended resource: META-INF/LICENSE.vm
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.027 s
[INFO] Finished at: 2025-05-11T00:46:30+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:3.3.0:process (process-resource-bundles) on project apache-maven: Error rendering Velocity resource 'META-INF/LICENSE.vm': Invocation of method 'getResourceAsFile' in  class org.codehaus.plexus.resource.DefaultResourceManager threw exception org.codehaus.plexus.resource.loader.ResourceNotFoundException: Could not find resource 'licenses/unrecognized.txt'. at remote-resources[line 75, column 39] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
➜  apache-maven git:(code-infra--Migrate-to-Java-21) 

[Pankraz76]

wip reopen when ci green