See http://java.sun.com/docs/books/jni/html/refs.html
"You must not write native methods that store a local reference in a static variable and expect to use the same reference in subsequent invocations."

This code is not following the rule:
/rt-closed/glass/glass-mat-lib-windows/src/GlassApplication.cpp
see classCls var in ClassForName()


I have checked the native code in javafx-font-native and it is fine.