Installing JBossWS 2.0.2.GA on JBoss 4.2.1.GA without having a JBossWS 2.0.1.GA installed result in a broken installation due to jbossws-jboss42.jar/jbossws-jboss421.jar missing in client libs.
The 2.0.2 installation script does not remove that lib, thus installing 2.0.1 and then 2.0.2 seems to be a workaround. This has to be verified as well as the 2.0.2 installation script / hudson conf for the 4.2.1.