Derive test expectations from the JDK feature version - #518
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The javac and eclipse compiler tests listed the JDKs they knew (11, 17, 21, 25) by substring, so any other JDK fell back to Java 1.3 source settings or to expecting ReservedWord.class, and the suite failed on JDK 26 and 27. A shared getJavaFeatureVersion() replaces the lists.
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The javac and eclipse compiler tests decided their expected errors, warnings, output files and
-source/-targetby checkingjava.versionfor the substrings11,17,21and25. Any other JDK fell through to the Java 1.3 defaults or to expectingReservedWord.class, so the suite failed on JDK 26 and 27 with four failures acrossplexus-compiler-javacandplexus-compiler-eclipse. This addsgetJavaFeatureVersion()toAbstractCompilerTest, which works on Java 8, and rewrites those checks as numeric comparisons. The errorprone test uses the same helper.Behaviour on JDK 11, 17, 21 and 25 is unchanged. On JDK 9 and 10 the
EclipseCompilerErrorsAsWarningsTestnow expects three output files like its two sibling tests, sinceasserthas been a keyword since Java 1.4.Stacked on #517.
Verified: full
mvn verifywith-Dversion.maven-invoker-plugin=3.10.2-SNAPSHOT→ green on JDK 27 and on JDK 26, including all 12 ITs. Not run on JDK 21 or 25 locally.This change was created with AI assistance.