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java.sql.SQLException: Protocol violation at oracle.jdbc.driver.T4CTTIfun.readRXH(T4CTTIfun.java:532) at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:319) at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186) at oracle.jdbc.driver.T4C7Ocommoncall.doOLOGOFF(T4C7Ocommoncall.java:61) at oracle.jdbc.driver.T4CConnection.logoff(T4CConnection.java:491) at oracle.jdbc.driver.PhysicalConnection.close(PhysicalConnection.java:3754)