FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

NOTE: The web page did not have a selection for the Java 1.6.0 release, so I selected the beta 2 option.

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
The Java 1.6.0 compiler appears to be incorrectly indicating that a non-static variable (outer class's 'this' variable) is being used in a static context.

This code compiles without error with Java 1.5.0_10 compiler.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Save the provided source code to appropriate .java file.
2) Compile using Java 1.6.0 javac.
3) See compiler error related to static use of non-static variable 'this'

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Code compiles with no errors. The JDK 1.5.0_10 release does compile this code without any errors.
ACTUAL -
Java 1.6 release compiler reports errors.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
d:\java\jdk1.6.0\bin\javac -cp . TestJava6.java
TestJava6.java:13: non-static variable this cannot be referenced from a static context
                    Saver saver = new DefaultSaver();
                                              ^
1 error

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

public abstract class TestJava6 {

    private static TestJava6 INSTANCE;

    public abstract Saver newSaver();

    public static TestJava6 get() {
        if (INSTANCE == null) {
            INSTANCE = new TestJava6() {

                public Saver newSaver() {
                    Saver saver = new DefaultSaver();
                    return saver;
                }
            };
        }
        return INSTANCE;
    }

    public static void set(TestJava6 factory) {
        INSTANCE = factory;
    }

    private class DefaultSaver implements Saver {
        public void save(String fileName) {
        }
    }

    public interface Saver {
        public void save(String fileName);
    }
}


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

CUSTOMER SUBMITTED WORKAROUND :
None if it is required that the DefaultSaver nested class is required to be a non-static class.

Making the DefaultSaver class static will result in a successful compilation. However, that doesn't resolved what appears to be an incorrect compilation error from the Java 1.6 compiler.