Java EE (Java Enterprise Edition) General Discussion

Hi,
I have to parse a xml document, that actually is received in many chunks, and unfortunately I have to parse it chunk by chunk and not at the end, when I've received all the chunks.
I was thinking at a SAX parser instead of StAX, since I have to push the parser when i receive the data.
I was also thinking at an OutputStream where to write the chunks when I receive them, and pipe the OutputStream to an InputStream to be passed to the parser.
But I think there is no way to let the parser read from the InputStream in the same thread. So I have to create a thread for every receiving document, but ince the program may actually receive many different documents at the same time and that chunks may be received with long delays I have to create many threads that will be mainly idle while waiting for the chunks.
Is there a way to bypass the piped input and output streams and directly call the parser on a single chunk when it is received?
In other words, is there a way to call in the same thread a parse only for a xml document chunk, and call it many times until the document is completely received?
thank you very much,
marco