When editing a page via XML-RPC using Apache java client, once the size of the page gets a certain size, I get an error on the client side of

org.xml.sax.SAXParseException: Premature end of file.
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1231)

Size 6450 characters is OK.
Size 7525 characters is broken.

When I worked with Anatoli to try to replicate this, and I ran against confluence running on his dev box without SSL or an apache front-end, this worked for me.