desruisseaux commented on PR #1019:
URL: 
https://github.com/apache/maven-compiler-plugin/pull/1019#issuecomment-3799724596

   The compilation fails on Java 25 with the following compilation errors:
   
   ```
   target/it/MCOMPILER-540/code/src/main/java/bar/MyAnnotatedClass.java:25: 
error: cannot find symbol
       MyGeneratedClass generatedClass = new MyGeneratedClass();
       ^
     symbol:   class MyGeneratedClass
     location: class MyAnnotatedClass
   target/it/MCOMPILER-540/code/src/main/java/bar/MyAnnotatedClass.java:25: 
error: cannot find symbol
       MyGeneratedClass generatedClass = new MyGeneratedClass();
                                             ^
     symbol:   class MyGeneratedClass
     location: class MyAnnotatedClass
   2 errors
   4 warnings
   ```
   
   I presume that `MyGeneratedClass` was generated by annotation processor. The 
default value of the `-proc` compiler option changed from `full` prior Java 23 
to `non` since Java 23. I presume that the `MCOMPILER-540` integration test 
relies on the default value, which would explain why the same test passes in 
Java 17 and 21 but fails with Java 25.
   
   The fix would be to add the `<proc>full</proc>` configuration option in the 
compiler plugin integration test MCOMPILER-540. We may need to check if there 
are other tests in this situation.


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