Currently the maven-jaxws-tools-plugin has all three stacks dependencies (even if with test scope) in its dependency tree and more serious the jbossxb too. The latter is there due to classloader issues when using jbossws-native tools; basically the plugin should avoid loading anything stack specific before handling over to the stack tools, otherwise CNFE and CCE are likely to happen.
The JBWS-CXF tools also need to avoid using DOMUtils as that comes with a static threadlocal member that also causes classloading issues.