Are you refering to a mime multipart message? I am not sure I follow which content length field you are talking about.
We do all the SOAP processing in our servlet for different reasons. When we generate the response it is done through SAAJ.
The transmitted message always comes up as:
Some clients have problems with that as there is no Content-Length: field in the header.
A server log with org.jboss.axis at debug (maybe trace) level should show the message and the HTTP header fields.
Can show us an example of an incorrect Content-Length field?