The MTOM implementation in 2.0.1 depends on saaj-impl.jar (InternetHeaders,
MessagingExcpetion,...) and sjsxp.jar(UTFOutputStreamWriter,...). It would be
nice if these useful classes were independent of the stax and saaj
implementations so users who have use their own saaj and stax impl do not have
to include the whole jar. There's also a problem with just including the jars
because then unwanted services files will be loaded.