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java.lang.NullPointerException: 	at oracle.jdbc.driver.T4CConnection.updateSessionProperties(T4CConnection.java:1862)	at oracle.jdbc.driver.T4CTTIkvarr.unmarshal(T4CTTIkvarr.java:119)	at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:515)	at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)	at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:416)	at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:825)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:596)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:715)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:385)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)	at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:303)	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:230)	at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:175)	at oracle.hadoop.utils.DBUtils$ConnectionBuilder.getConnection(DBUtils.java:438)	at oracle.hadoop.utils.DBUtils$ConnectionBuilder.getConnection(DBUtils.java:331)	at oracle.hadoop.exttab.ExternalTable.getConnection(ExternalTable.java:1020)	at oracle.hadoop.exttab.ExternalTable.run(ExternalTable.java:3392)	at oracle.hadoop.exttab.ExternalTable.run(ExternalTable.java:3481)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)	at oracle.hadoop.exttab.ExternalTable.main(ExternalTable.java:3594)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.apache.hadoop.util.RunJar.run(RunJar.java:221)	at org.apache.hadoop.util.RunJar.main(RunJar.java:136)