Just call HotSpotDiagnostic.getDiagnosticOptions() and you get the exception below:

java.lang.NullPointerException
	at  xxxxx .management.Flag.getVMOption(Flag.java:67)
	at  xxxxx .management.HotSpotDiagnostic.getDiagnosticOptions(HotSpotDiagnostic.java:48)
	at GetDiagnosticOptions.checkDiagnosticOptions(GetDiagnosticOptions.java:56)
	at GetDiagnosticOptions.main(GetDiagnosticOptions.java:46)
	at  xxxxx .reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at  xxxxx .reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at  xxxxx .reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:623)
	at com. xxxxx .javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:78)
	at java.lang.Thread.run(Thread.java:674)

Works with 6u5 - throws NPE with 6u10 and OpenJDK 7.
Posted Date : 2008-02-04 15:54:50.0

N/A

Some string VM option was changed from an empty string to NULL in HotSpot due to a fix for 
6604006.  So we need to deal with VM options with null value.
Posted Date : 2008-02-11 22:38:16.0