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Description:
couldnt find the libfile.so, and libstubs as mentioned in your
documentation for Implementing Native Methods in C.
Also the /include/javaString.h has an include file
java_lang_String.h which is not to be found.
the stubs were never created with the .stubs extension
they were created with .c extension
the javaString.h include file had some functions which are
not found to be implemented or the library is missing.