java.lang.NullPointerException
   at com.jaspersoft.ireport.designer.JrxmlEditorSupport.saveDocument(JrxmlEditorSupport.java:236)
   at com.jaspersoft.ireport.designer.JrxmlEditorSupport$1.save(JrxmlEditorSupport.java:71)
   at org.netbeans.core.NbLifecycleManager.saveAll(NbLifecycleManager.java:97)
   at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:470)
   at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)