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java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:489)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:553)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:254)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:528)	at java.sql.DriverManager.getConnection(DriverManager.java:571)	at java.sql.DriverManager.getConnection(DriverManager.java:215)	at org.apache.sqoop.manager.OracleManager.makeConnection(OracleManager.java:327)	at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)	at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:763)	at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:786)	at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:289)	at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:260)	at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:246)	at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:327)	at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1846)	at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1646)	at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:107)	at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)	at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:605)	at org.apache.sqoop.Sqoop.run(Sqoop.java:143)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)	at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)	at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)	at org.apache.sqoop.Sqoop.main(Sqoop.java:236)