Module-Info Version

Checks if module-info.class contains the precise JDK version or not, which makes Reproducible Build harder because the exact minor JDK release is required.

Result

• when using javac --release <r> with <r> not equals to major JDK version, no version is stored.
• but without --release or with --release <JDK major version>, the detailed JDK version is stored in module-info.class

Run

Tested with JDK 11 to JDK 21 EA, for example with 21 EA:

$ ./run.sh
openjdk 21-ea 2023-09-19
OpenJDK Runtime Environment (build 21-ea+31-2444)
OpenJDK 64-Bit Server VM (build 21-ea+31-2444, mixed mode, sharing)
'javac'
  1                                       // requires
    #8,8000                                 // "java.base" ACC_MANDATED
    #10                                     // 21-ea
'javac --release 21'
  1                                       // requires
    #8,8000                                 // "java.base" ACC_MANDATED
    #10                                     // 21-ea
'javac --release 20'
  1                                       // requires
    #8,8000                                 // "java.base" ACC_MANDATED
    #0
'javac --release 19'
  1                                       // requires
    #8,8000                                 // "java.base" ACC_MANDATED
    #0

Tracking

• Maven: MCOMPILER-542, fixed in Maven Compiler Plugin 3.12.0
• JDK: JDK-8318913, fixed in Java 22