In the following example, the parameter names for the constructor of the anonymous inner class in 'B' change depending on whether the sources are compiled separately or together. This occurs despite using -parameters, which should make the parameter names available during separate compilation.

$ cat A.java
class A {
 A(int x, int y) {}
}
$ cat B.java
class B {
  {
    new A(1, 2) {};
  }
}

# when both sources are compiled together, the constructor parameters of the anonymous inner class in B are 'x' and 'y'

$ javac -g -parameters A.java B.java
$ javap -v B\$1
...
  B$1(B, int, int);
    descriptor: (LB;II)V
    flags: (0x0000)
    Code:
...
      LocalVariableTable:
        Start Length Slot Name Signature
            0 12 0 this LB$1;
            0 12 1 this$0 LB;
            0 12 2 x I
            0 12 3 y I
    MethodParameters:
      Name Flags
      this$0 final mandated
      x
      y

# when B is compiled with A on the classpath, the constructor parameters of the anonymous inner class in B are 'x0' and 'x1'

$ javac -g -parameters B.java
$ javap -v B\$1
...
  B$1(B, int, int);
    descriptor: (LB;II)V
    flags: (0x0000)
    Code:
...
      LocalVariableTable:
        Start Length Slot Name Signature
            0 12 0 this LB$1;
            0 12 1 this$0 LB;
            0 12 2 x0 I
            0 12 3 x1 I
    MethodParameters:
      Name Flags
      this$0 final mandated
      x0
      x1