新手,JDBC处理存储过程出错

import java.sql.*;
public class TestProc {

	public static void main(String[] args) throws Exception{
		Class.forName("oracle.jdbc.driver.OracleDriver"); 	
		Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.101:1521:ORCL","scott","372158");
		CallableStatement cstmt = conn.prepareCall("{call p(?, ?, ?, ?)}");
		cstmt.registerOutParameter(3, Types.INTEGER);
		cstmt.registerOutParameter(4, Types.INTEGER);
		cstmt.setInt(1, 3);
		cstmt.setInt(2, 4);
		cstmt.setInt(4, 5);
		cstmt.execute();
		System.out.println(cstmt.getInt(3));
		System.out.println(cstmt.getInt(4));
		cstmt.close();
		conn.close();
	}
}