I added a field to Object class, as in :

class Object {
   ...

   private Object _objInfo;
}

I changed java.lang.Object's source code and recompiled OpenJDK 6. I get the following exception when the VM boots:

Error occurred during initialization of VM
    java.lang.IllegalStateException
    at java.lang.Throwable.initCause(Throwable.java:337)
    at java.lang.ExceptionInInitializerError.<init>(ExceptionInInitializerError.java:79)

The same problem occurs when I define my own Object class and prepended it to bootclasspath, as in:

java -Xbootclasspath/p:<path to my Object class>

Thanks, Horatiu

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