Passing a pointer from JNI to Java using a long?

In your example struct myStruct_s mystruct; is a local variable on the stack, and therefore not available after the function returns. Possubly that's just a cut-down of your code, but if not then use a malloc(sizeof(struct myStruct_s)) to get yourself a heap allocation. That then raises the question of when you are going to free that allocation, watch out for memory leaks.

In additiona to @Moise's suggestion I would cast the pointer to a long ratehr than a long * long lp = (long)&myStruct.

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