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java.sql.SQLException: Protocol violation at oracle.jdbc.driver.T4CTTIfun.readRXH( at oracle.jdbc.driver.T4CTTIfun.receive( at oracle.jdbc.driver.T4CTTIfun.doRPC( at oracle.jdbc.driver.T4C7Ocommoncall.doOLOGOFF( at oracle.jdbc.driver.T4CConnection.logoff( at oracle.jdbc.driver.PhysicalConnection.close(