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java.lang.NullPointerException: 	at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1189)	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)	at oracle.jdbc.driver.OracleStatement.executeInternal(OracleStatement.java:1909)	at oracle.jdbc.driver.OracleStatement.execute(OracleStatement.java:1871)	at oracle.jdbc.driver.OracleStatementWrapper.execute(OracleStatementWrapper.java:318)	at oracle.dbtools.db.DBUtil.hasAccess(DBUtil.java:1817)	at oracle.dbtools.raptor.query.QueryUtils.checkNonOracleAccess(QueryUtils.java:506)	at oracle.dbtools.raptor.query.QueryUtils.getQuery(QueryUtils.java:337)	at oracle.dbtools.raptor.query.QueryUtils.getQuery(QueryUtils.java:242)	at oracle.dbtools.raptor.query.ObjectQueries.getQuery(ObjectQueries.java:42)	at oracle.dbtools.raptor.navigator.db.xml.XmlObjectFactory.createFolderInstance(XmlObjectFactory.java:49)	at oracle.dbtools.raptor.navigator.db.xml.XmlTypeOwnerInstance.listTypeFolders(XmlTypeOwnerInstance.java:93)	at oracle.dbtools.raptor.navigator.db.impl.TypeContainerTreeNode.loadTypeFolders(TypeContainerTreeNode.java:111)	at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$LoadTask.doWork(DatabaseTreeNode.java:184)	at oracle.dbtools.raptor.navigator.db.impl.DatabaseTreeNode$LoadTask.doWork(DatabaseTreeNode.java:112)	at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:193)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:554)	at java.util.concurrent.Executors$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:745)