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Message: [QUOTE="Stefan Schulz, post: 600885"] I would suggest you build a "Java Wrapper" around the native resource, maybe something like this: public abstract class PointerWrapper { private final long ptr; protected PointerWrapper(long ptr){ this.ptr = ptr; } public final long getPointer(){ if (freed){ throw new IllegalStateException(); } } public boolean isValid(){ return !freed; } public final void free(){ if (freed){ throw new IllegalStateException(); } freed = true; free(ptr); } protected final void finalize() throws Throwable { free(); } protected abstract void free(long pointer); }} If the resource may persist longer, you might even try making free() private. WARNING: This was written from memory. It may contain typos, or even logical errors, but this is the general way i would go about things. [/QUOTE]