Android: Implement Java exception handling, make sure all return values from JNI are sane. This allows you to break in _dw_jni_check_exception() on or before return TRUE to catch any Java exceptions, otherwise they will be cleared and the functions will return failure. Fix the NullPointerException from the last commit, it was in windowGetData with a non existant key in the data SimpleArrayMap.

[Desktop Entry]
Name=Dynamic Windows Test
Exec=@prefix@/bin/dwtest 
Terminal=false
MultipleArgs=false
Type=Application
Categories=Application;Development;X-Red-Hat-Base;