[JIRA] [core] (JENKINS-22525) "incompatible InnerClasses attribute" error in IBM J9 VM

Thu, 31 Jul 2014 10:22:31 -0700

 
Kohsuke Kawaguchi edited a comment on Bug JENKINS-22525

As for ItemList not in the InnerClasses attribute, I'm discovering with the following test case that if a nested/inner class is marked as private, it does not get recorded in the InnerClasses attribute:

public class App 
{
    private static class Foo {}
    private class Bar {}

    static class Alpha {}
    class Bravo {}

    public static void main( String[] args )
    {
        System.out.println(Foo.class.getEnclosingClass());
        System.out.println(Bar.class.getEnclosingClass());

        System.out.println(Alpha.class.getEnclosingClass());
        System.out.println(Bravo.class.getEnclosingClass());
    }
}
Classfile /files/kohsuke/ws/jenkins/investigations/JENKINS-22525/jenkins22525/target/classes/test/App.class
  Last modified Jul 31, 2014; size 1158 bytes
  MD5 checksum 264ed3611a578e1a4c8e2d4e0ea8b378
  Compiled from "App.java"
public class test.App
  SourceFile: "App.java"
  InnerClasses: 
       #11= #8 of #9; //Bravo=class test/App$Bravo of class test/App
       static #13= #7 of #9; //Alpha=class test/App$Alpha of class test/App
  RuntimeInvisibleAnnotations:
    0: #57()
  minor version: 0
  major version: 49
  flags: ACC_PUBLIC, ACC_SUPER

Classfile /files/kohsuke/ws/jenkins/investigations/JENKINS-22525/jenkins22525/target/classes/test/App$Foo.class
  Last modified Jul 31, 2014; size 303 bytes
  MD5 checksum 3f4b082e8d8c5cbf85d4afeb7807b253
  Compiled from "App.java"
class test.App$Foo
  SourceFile: "App.java"
  minor version: 0
  major version: 49
  flags: ACC_SUPER

Classfile /files/kohsuke/ws/jenkins/investigations/JENKINS-22525/jenkins22525/target/classes/test/App$Alpha.class
  Last modified Jul 31, 2014; size 309 bytes
  MD5 checksum df99610f5b28798c5f07f308b749df89
  Compiled from "App.java"
class test.App$Alpha
  SourceFile: "App.java"
  InnerClasses: 
       static #10= #2 of #16; //Alpha=class test/App$Alpha of class test/App
  minor version: 0
  major version: 49
  flags: ACC_SUPER

This seems to violate JVM spec of the InnerClass attribute. J9 VM accepts this without reporting an error. In this case I don't understand how JVM can correctly determine that App$Foo has an enclosing class. From the byte code, there's no way to distinguish this vs compiling the following class:

class App {}
class App$Foo {} // '$' is a legal character in a class name in Java
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