[JDBC] Protocol Violation error

Hi guys.
I ran into an extrodinary error, "Protocol Violation" in JDBC.
This error occurred in rs.next() method (ResultSet rs) for a specific record of result set.
Why this happen? any ideas?

java.sql.SQLException: Protocol violation
at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:383)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java, Compiled Code)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java, Compiled Code)
at oracle.jdbc.ttc7.TTC7Protocol.fetch(TTC7Protocol.java, Compiled Code)

at oracle.jdbc.driver.OracleResultSet.next(OracleResultSet.java, Compiled Code)
at UserList.getUsers(UserList.java, Compiled Code)
at UserList.run2(UserList.java:100)
at UserList.main(UserList.java:28)

Did you figure this one out? I get a similar error when I simply try to connect! Funny thing is that I can connect to another Oracle table without any problem.

java.sql.SQLException: Protocol violation
java.lang.Throwable(java.lang.String)
java.lang.Exception(java.lang.String)
java.sql.SQLException(java.lang.String, java.lang.String, int)
void oracle.jdbc.dbaccess.DBError.throwSqlException(java.lang.String, java.lang.String, int)
void oracle.jdbc.dbaccess.DBError.throwSqlException(int, java.lang.Object)
void oracle.jdbc.dbaccess.DBError.check_error(int)
void oracle.jdbc.ttc7.O3log.receive2nd()
oracle.jdbc.dbaccess.DBConversion oracle.jdbc.ttc7.TTC7Protocol.logon(java.lang.String, java.lang.String, java.lang.String, java.util.Properties)
oracle.jdbc.driver.OracleConnection(oracle.jdbc.dbaccess.DBAccess, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.util.Properties)
java.sql.Connection oracle.jdbc.driver.OracleDriver.getConnectionInstance(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.util.Properties)
java.sql.Connection oracle.jdbc.driver.OracleDriver.connect(java.lang.String, java.util.Properties)
java.sql.Connection java.sql.DriverManager.getConnection(java.lang.String, java.util.Properties, java.lang.ClassLoader)
java.sql.Connection java.sql.DriverManager.getConnection(java.lang.String, java.lang.String, java.lang.String)
java.sql.Connection testing.OracleTest.getConnection()
void testing.OracleTest.main(java.lang.String [])


thanks,