Type of the value popped by the astore instruction?

Hi,
I would like to monitor the assignment to a local variable of java reference type. But the astore instruction may pop a returnAddress type value. How may I check if the popped value is of returnAddress type or a reference type? Thank you in advance.
-- Sunny

Cross posted.
http://forum.java.sun.com/thread.jspa?threadID=762635&messageID=4351916#4351916

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