OpenJDK 22 GA is scheduled for 2024/03/19.

The following JEPs are important for us:

• 447: Statements before super(...) (Preview)
• 456: Unnamed Variables & Patterns
• 459: String Templates (Second Preview)
• 463: Implicitly Declared Classes and Instance Main Methods (Second Preview)

In summary: https://javaalmanac.io/jdk/22/

This issue is similar to the previous: #4583

EA Release of JDK22 is available here: https://jdk.java.net/22/

Tasks:

• Add new java language versions 22 and 22-preview: net.sourceforge.pmd.lang.java.JavaLanguageModule
  • 22 is the new default
  • update also java.md and ant.md
  • and add in KotlinTestingDsl.kt.
  • Update net.sourceforge.pmd.lang.java.LanguageVersionTest
  • Update net.sourceforge.pmd.lang.java.JavaLanguageModuleTest#previewVersionShouldBeGreaterThanNonPreview
• Update asm dependency to 9.6:
  • https://search.maven.org/artifact/org.ow2.asm/asm
  • https://asm.ow2.io/versions.html
  • Update net.sourceforge.pmd.lang.java.symbols.internal.asm.AsmSymbolResolver#ASM_API_V if necessary
• Remove java language version 20-preview: net.sourceforge.pmd.lang.java.JavaLanguageModule
  • update also java.md
  • update KotlinTestingDsl.kt
  • remove exclusions in pmd-core/src/main/resources/internal/all-java.xml
  • Update net.sourceforge.pmd.lang.java.LanguageVersionTest
  • Remove net.sourceforge.pmd.lang.java.ast.Java20PreviewTreeDumpTest (including resources)
• Update implementation for "String Templates" (430, 459)
  • https://cr.openjdk.org/~gbierman/jep459/jep459-20231114/specs/string-templates-jls.html
  • "Except for a technical change in the types of template expressions, there are no changes relative to the first preview."
• Update implementation for "Implicitly Declared Classes and Instance Main Methods" (445, 463)
  • https://cr.openjdk.org/~gbierman/jep463/jep463-20231030/specs/implicitly-declared-classes-instance-main-methods-jls.html
• Update implementation for "Unnamed Variables & Patterns" (443, 456)
  • https://cr.openjdk.org/~abimpoudis/unnamed/jep456-20231128/specs/unnamed-jls.html
  • Promote this feature to a standard language feature (was preview before). E.g. remove experimental
  • "We here propose to finalize this feature without change."
• Implement preview feature "Statements before super(...)" (447)
  • https://cr.openjdk.org/~gbierman/jep447/jep447-20230927/specs/statements-before-super-jls.html
• Write release notes
  • removed experimental:
    • ASTUnnamedPattern
  • removed classes: -
  • deprecated classes: -
  • new experimental: -
• Add JDK22 to the build, so that we integration test with 22, as this is a LTS version
  • integration test in pmd-dist
  • Not necessary, as JDK22 is not LTS
• Make sure, we can build PMD with JDK22
• Update https://github.com/pmd/java-regression-tests
  • new regular language features, so update needed
  • Note: This can only be done, after this issue has been implemented
  • See Add java22 samples from PMD java-regression-tests#2