java.lang.NullPointerException
   at org.netbeans.modules.maven.jaxws.WSUtils.addServlet(WSUtils.java:737)
   at org.netbeans.modules.maven.jaxws.WSUtils.addServiceToDD(WSUtils.java:695)
   at org.netbeans.modules.maven.jaxws.MavenJAXWSSupportImpl.addService(MavenJAXWSSupportImpl.java:102)
   at org.netbeans.modules.websvc.jaxws.light.api.JAXWSLightSupport.addService(JAXWSLightSupport.java:123)
   at org.netbeans.modules.maven.jaxws.MavenJaxWsSupportProvider$WebservicesChangeListener.updateJaxWs(MavenJaxWsSupportProvider.java:283)
   at org.netbeans.modules.maven.jaxws.MavenJaxWsSupportProvider$WebservicesChangeListener.access$400(MavenJaxWsSupportProvider.java:181)
   at org.netbeans.modules.maven.jaxws.MavenJaxWsSupportProvider$WebservicesChangeListener$1.run(MavenJaxWsSupportProvider.java:190)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1407)
   at org.netbeans.modules.maven.jaxws.MavenJaxWsSupportProvider$WebservicesChangeListener.propertyChange(MavenJaxWsSupportProvider.java:201)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.netbeans.modules.j2ee.dd.impl.webservices.annotation.WebservicesImpl$1.stateChanged(WebservicesImpl.java:102)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:130)
   at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:116)
   at org.netbeans.modules.j2ee.metadata.model.api.support.annotation.PersistentObjectManager$1.run(PersistentObjectManager.java:233)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1369)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1907)