Hi, The Multi-Release JarFile support JEP[1] notes that the jar file is expected to contain a main attribute:
Multi-Release: true The JarFile javadoc[1] on the other hand makes no mention of the value for such an attribute and just mentions that the Multi-Release main attribute needs to be present: "A multi-release jar file is a jar file that contains a manifest with a main attribute named "Multi-Release",..." Which one of these 2 docs is expected to be the formal specification? I'm guessing it's the javadoc, in which case, is it intentional that the value for this attribute isn't mentioned or is it just a miss? My quick tests show that the implementation of this feature does indeed expect the value to be a "true" for it to consider the versioned entries in a multi-release jar. [1] http://openjdk.java.net/jeps/238 [2] https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/jar/JarFile.html -Jaikiran
