java.sql.SQLException: Protocol violation

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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)

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