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I've noticed this in a commit validation test: java.util.ConcurrentModificationException java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) java.util.AbstractList$Itr.next(AbstractList.java:343) org.nb.modules.j2ee.deployment.impl.ServerRegistry.firePluginListeners(:595) org.nb.modules.j2ee.deployment.impl.ServerRegistry.addPlugin(:208) org.netbeans.modules.j2ee.deployment.impl.ServerRegistry.init(:147) org.netbeans.modules.j2ee.deployment.impl.ServerRegistry.serversMap(:181)
Fixed by Jesse in c7634fa79716.