Name: rmT116609 Date: 06/02/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b51)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b51, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows XP (actually shoud affect regardless of OS)

A DESCRIPTION OF THE PROBLEM :
There is a problem with classes that were retrofitted to implement Comparable<acutal> class, particularly with File that implements
Comparable<File>.

If descendand of this class was already compiled with 1.4 compiler and was overriding both versions of compareTo method (which is not legal in 1.5 -- might be a separate problem), then it is not possible (in 1.5) to compile any subclass of this (already compiled) class.

So, many libraries (that are distributed as jars) may become unusuable in 1.5.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the following code with 1.4.2_04:

import java.io.File;

public class Over15A extends File {
public Over15A(String s) { super(s); }
public int compareTo(File file) { return 0; }
public int compareTo(Object o) { return 0; }
}

and try to compile the following code with 1.5-beta2:

public class Over15B extends Over15A {
public Over15B(String s) { super(s); }
}


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Must compile
ACTUAL -
Compilation error.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Over15B.java:1: name clash: compareTo(java.lang.Object) in Over15A and compareTo(T)
in java.lang.Comparable<java.io.File> have the same erasure, yet neither overrides the other

REPRODUCIBILITY :
This bug can be reproduced always.
(Incident Review ID: 276020)
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