rt.jat instrumentation causes JVM crash

Hi,

I'm trying to instrument the boot class loader classes, after some
long work I found out that adding new field to some of these classes
breaks the JVM.
So after I removed those fields and left only adding new methods to
the boot classes I'm still getting the following error on JVM
initialization, any ideas?

Error occurred during initialization of VM
java.lang.ExceptionInInitializerError
Caused by: java.lang.NullPointerException
       at java.lang.String.charAt(String.java:689)
       at java.security.BasicPermission.init(BasicPermission.java:93)
       at java.security.BasicPermission.<init>(BasicPermission.java:129)
       at java.lang.RuntimePermission.<init>(RuntimePermission.java:335)
       at java.lang.Thread.<clinit>(Thread.java:1493)

Or if I don't instrument the java.lang.* classes.

Error occurred during initialization of VM
java.lang.NullPointerException
       at java.util.Hashtable.put(Hashtable.java:394)
       at java.lang.System.initProperties(Native Method)
       at java.lang.System.initializeSystemClass(System.java:1072)

Thanks,
Guy

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