java.lang.NullPointerException
   at org.netbeans.modules.j2ee.deployment.impl.ServerFileDistributor.distributeOnSave(ServerFileDistributor.java:208)
   at org.netbeans.modules.j2ee.deployment.impl.TargetServer.distributeChangesOnSave(TargetServer.java:252)
   at org.netbeans.modules.j2ee.deployment.impl.TargetServer.notifyArtifactsUpdated(TargetServer.java:886)
   at org.netbeans.modules.j2ee.deployment.impl.DeployOnSaveManager$DeployTask.notifyServer(DeployOnSaveManager.java:548)
   at org.netbeans.modules.j2ee.deployment.impl.DeployOnSaveManager$DeployTask.run(DeployOnSaveManager.java:452)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
   at java.lang.Thread.run(Thread.java:744)