Java连接Oracle数据库异常

连接代码是：
import java.sql.*;
class MyOracle{
public static void main(String args[]) {
try{
DriverManager.registerDriver( new  oracle.jdbc.driver.OracleDriver());   
String url="jdbc:oracle:thin:@localhost:5500:aaa";
Connection conn=DriverManager.getConnection(url,"user1","pass1");
CallableStatement c= conn.prepareCall("{call sumeng(?,?)}");
c.setString(1,"13");
c.setString(2, "xiaomao");
c.execute();
conn.close(); }
catch(Exception ex){
System.out.println(ex);
System.exit(0); }
}
}
报的异常是：
java.sql.SQLException: Io 异常: Bad packet type
向高手求教~~

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存储过程贴上来看看呢