myeclipce 怎么链接不上 db2 求解

报错信息
error:A communication error has been detected. Communication protocol being used: Reply.fill(). Communication API being used: InputStream.read(). Location where the error was detected: insufficient data. Communication function detecting the error: *. Protocol specific error codes(s) TCP/IP SOCKETS   DB2ConnectionCorrelator: null

java 链接数据库测试代码

public static void main(String[] args){

        String driver = "com.ibm.db2.jcc.DB2Driver";
        String url = "jdbc:db2://localhost:50000/cwswl";
        String userName = "db2admin";
        String passWord = "555555";

        Connection conn = null;
        Statement st = null;
        ResultSet rs = null;
        String sql = null;
        try {
            Class.forName(driver).newInstance();

            conn = DriverManager.getConnection(url,userName,passWord);

            st = conn.createStatement();
            sql = "select * from db2admin.registerdb";

            rs = st.executeQuery(sql);

            while(rs.next()){

             System.out.println("连接成功");
                System.out.println(rs.getString(1));
            }

            conn.close();
        } catch (Exception e){
         System.out.println("链接失败");
            System.out.println("error:" + e.getMessage() );
            //System.out.println(e.toString());
        }
    } --------------------编程问答-------------------- 沙发，请人来帮忙看看呀！ --------------------编程问答-------------------- 没见过这错误  帮你查了  没查到。。。 --------------------编程问答-------------------- 参考这边吧...
http://bytes.com/topic/db2/answers/184909-problems-type-4-jdbc-driver

补充：Java ,  Web 开发