IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > Global garbage collection

JNI weak reference

JNI weak references provide the same capability as that of WeakReference objects, but the processing is very different. A JNI routine can create a JNI Weak reference to an object and later delete that reference. The Garbage Collector clears any weak reference where the referent is unmarked, but no equivalent of the queuing mechanism exists.

Failure to delete a JNI Weak reference causes a memory leak in the table and performance problems. This also applies to JNI global references. The processing of JNI weak references is handled last in the reference handling process. The result is that a JNI weak reference can exist for an object that has already been finalized and had a phantom reference queued and processed.

Parent: Global garbage collection

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