When serializable anonymous inner class is used, VM throws java.lang.ClassFormatError.

Exception in thread "main" java.lang.ClassFormatError: Illegal class name "Test+1"
        at sun.misc.Unsafe.defineClass(Native Method)
        at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:45)
        at sun.reflect.MethodAccessorGenerator+1.run(MethodAccessorGenerator.java:381)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:377)
        at sun.reflect.MethodAccessorGenerator.generateSerializationConstructor(MethodAccessorGenerator.java:95)
        at sun.reflect.ReflectionFactory.newConstructorForSerialization(ReflectionFactory.java:321)
        at java.io.ObjectStreamClass.getSerializableConstructor(ObjectStreamClass.java:1310)
        at java.io.ObjectStreamClass.access+1600(ObjectStreamClass.java:47)
        at java.io.ObjectStreamClass+3.run(ObjectStreamClass.java:396)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:375)
        at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:270)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1026)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1366)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1338)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1281)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1070)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:291)
        at Test.main(Test.java:15)



java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32, mixed mode)

This bug is introduced by the fix for 4884881 made in javac

Steps to reproduce:

1. Compile and run Test.java
2. Throws ClassFormatError.

===========================================================================
//Test.java
import java.io.*;

public class Test implements Serializable {

    Serializable ser = new Serializable() {
    };

    public static void main(String[] args) {
        Test test = new Test();

        ObjectOutputStream stream = null;

        try {
            stream = new ObjectOutputStream(new FileOutputStream("temp"));
            stream.writeObject(test);
            stream.close();
        } catch(IOException e) {
            System.err.println("Couldn't write to temp : " + e);
        }
        System.out.println("Unexpected success");
    }
}
=========================================================================