java.sql.SQLException Protocol Violation

hi
I am writing a program using jdbc on linux. my code is
Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL","username","passwd");

I am getting following exception.
I could able to connect using sqlplus and tnslistener is working properly

can anybody please tell me what the problem is

java.sql.SQLException: Protocol violation

	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156)
	at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:803)
	at oracle.jdbc.ttc7.O3log.receive2nd(O3log.java:520)
	at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java:230)
	at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:198)	at
oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:251)
	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:224)
	at java.sql.DriverManager.getConnection(DriverManager.java:457)
	at java.sql.DriverManager.getConnection(DriverManager.java:137)
	at Temp.main(Temp.java:7)

sincere thanks
prudhvi Received on Mon Nov 19 2001 - 22:56:30 CST