NullPointerException on missing Plexus config children in AbstractEarMojo.initializeJbossConfiguration()

[elharo]

Description

In AbstractEarMojo.java:329-364, multiple calls to jboss.getChild(...) are not null-checked before calling .getValue():

• Line 329: jboss.getChild(JbossConfiguration.VERSION).getValue() — NPE if <version> missing
• Lines 334-335: jboss.getChild(JbossConfiguration.SECURITY_DOMAIN).getValue() — NPE if missing
• Lines 336-337: jboss.getChild(JbossConfiguration.UNAUHTHENTICTED_PRINCIPAL).getValue() — NPE if missing
• Lines 339-340: jboss.getChild(JbossConfiguration.LOADER_REPOSITORY).getValue() — NPE if missing
• Lines 349, 351, 363-364: Same pattern

Lines 354-355 of the same method prove that getChild() can return null, as the author already null-checks it for dataSources there. The other 7+ calls are inconsistent and will throw NPE if those config elements are absent.

Expected behavior

Add null checks consistent with the existing dataSources handling pattern.