Why can't local references be cached ?
Hi,
I read that the local references created during the lifetime of a native method cannot be cached and used in another lifetime of the native method. I don't understand why they can't be cached. I know that the VM creates a registry of local references, which is deleted once the lifetime of a native method is over, thereby allowing the objects referred by those local references be eligible for garbage collection. But then if a local reference is cached to some global/static variable, then the object referenced cannot be GCed. Hence we should be able to use that cached reference in a later execution of the native method too. i.e., Even though the local reference of the eariler exceution was freed, since we have cached its value (which I assume is a sort of pointer to the actual object), we should be able to use the cached reference. If not, can anyone please explain why this does not work like that ?
Thanks.
I don't want global reference. But I just wanted to understand why local references can't be cached. Though I had read what all you said above, before posting my question, the answer somehow occurred to me while I was reading your reply. So, thanks.
I think the cruical point here is that, the JVM is not aware of the copies of the local references. It does not know and care how many copies of local references we (JNI programmers) make at the JNI level.
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