Can you verify if this happens with a later versoin of JBossWS?
yes, i tried jboss-ws 1.2.0 since i submited the first post.
however i encountered a different problem and gave up to study this problem with the lastest version. because i need to fix it asap.
If you need to fix it asap, i would recommend just increasing your stack size (-Xss jvm option). Otherwise if you can create a test case that demonstrates the problem and attach it to a jira issue, we can debug it.