Compiling the following class with -parameters generates buggy code:

class TestMethodParameters {
    void test(final int i) {
        class L {
            L(final int j) {
               this(new Object() { void test() { int x = i; } });
            }
            L(Object o) { }
        }
        new L(i) { };
    }
}


Javap shows:

WhichImplicitThis9$1L(int);
    descriptor: (LWhichImplicitThis9;II)V
    flags:
    Code:
      stack=6, locals=4, args_size=4
         0: aload_0
         1: aload_1
         2: new #1 // class WhichImplicitThis9$1L$1
         5: dup
         6: aload_1
         7: iload_3
         8: invokespecial #2 // Method WhichImplicitThis9$1L$1."<init>":(LWhichImplicitThis9;I)V
        11: iload_3
        12: invokespecial #3 // Method "<init>":(LWhichImplicitThis9;Ljava/lang/Object;I)V
        15: return
      LineNumberTable:
        line 122: 0
        line 123: 15
Error: java.lang.reflect.InvocationTargetException
      MethodParameters: length = 0x9
       03 00 0D 80 10 00 14 00 10
    Signature: #22 // (I)V


As it can be seen, the MethodParameters attribute is ill formed:

 03 00 0D 80 10 00 14 00 10

This means that there are 3 entries (leading 03) - but only two pairs of name and values (both u2) can be found.

The other constructor is fine:

WhichImplicitThis9$1L(java.lang.Object);
    descriptor: (LWhichImplicitThis9;Ljava/lang/Object;I)V
    flags:
    Code:
      stack=2, locals=4, args_size=4
         0: aload_0
         1: aload_1
         2: putfield #4 // Field this$0:LWhichImplicitThis9;
         5: aload_0
         6: iload_3
         7: putfield #5 // Field val$i:I
        10: aload_0
        11: invokespecial #6 // Method java/lang/Object."<init>":()V
        14: return
      LineNumberTable:
        line 124: 0
    MethodParameters:
      Name Flags
      this$0 final mandated
      o
      val$i final synthetic