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IllegalStateException forwarding from servlet to JSP

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I have searched around for an answer but couldn't find one suitable. My understanding is if you use request dispatcher to forward your request, you must not have a request already pending. That makes sense to me, and seems as if working as expected within in App Server.
My problem is I am getting an IllegalStateException when I put some stress on my application. I ran a test with about 1000 requests and 4 or 5 came up with the IllegalStateExcpetion ERROR: Cannot forward. The response has already been committed.
Do any of you know what causes this or if there is a solution? Can it be locking of the JSP file (I thought as long as JSPs were thread safe they should be fine.) I am passing a Bean and using a jsp:useBean with scope="request".
I'll post some code if my description doesn't spark an answer.
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