No, the problem looks to be caused by you targeting one runtime before (i.e. "jboss 4.2-runtime") and now that runtime is gone or possibly renamed to something else "jboss 4.2.3-runtime" or similar.
That shouldn't though cause an NPE in GA since we fixed this (or a similar one) a while ago.
Does this happen in GA ? If yes, could you please open a jira issue on it with the stacktrace and attach your .classpath file from the project that is causing problems ?
Thank you!