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java.lang.NullPointerException: 	at oracle.jdbc.driver.T2CConnection.logon(T2CConnection.java:327)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:347)	at oracle.jdbc.driver.T2CConnection.(T2CConnection.java:139)	at oracle.jdbc.driver.T2CDriverExtension.getConnection(T2CDriverExtension.java:79)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:549)