FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b59)
Java HotSpot(TM) Client VM (build 16.0-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [version 6.0.6000]

A DESCRIPTION OF THE PROBLEM :
I was trying to retrofit a program written in Java 1.4 to use generics.
It's currently impossible without adding some lines of code
because Collections.list() was not correctly generified in 1.5.

It should take a wildcard i.e:
public static <T> ArrayList<T> list(Enumeration<T> e)
should be
public static <T> ArrayList<T> list(Enumeration<? extends T> e)

In the program, the returned ArrayList is used in Collections.sort
with a hadhoc comparator, so the


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Try to compile the source code.
This code compiles and safely works with a pre-1.5 compiler
if you remove type arguments.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should compile.

ACTUAL -
The compiler emits an error because
Collections.list(file.entries())
returns an ArrayList<? extends ZipEntry>.



ERROR MESSAGES/STACK TRACES THAT OCCUR :
output of javac:
  Bug.java:14: incompatible types
    ArrayList<ZipEntry> list = Collections.list(file.entries());
                                               ^
  required: java.util.ArrayList<java.util.zip.ZipEntry>
  found: java.util.ArrayList<capture#1 of ? extends java.util.zip.ZipEntry>
1 error

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class Bug {
  public static void main(String[] args) throws IOException {
    ZipFile file=new ZipFile(args[0]);
    ArrayList<ZipEntry> list = Collections.list(file.entries());
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
duplicate the ArrayList.