今天遇到这样一个问题，mysql无法登陆，日志提示如下：
[Wed Nov 12 14:15:38 CST 2008][MysqlDb.connectDB]java.sql.SQLException: Client does not support authentication protocol requested by server; consider upgrading MySQL client

搜了一下，好多人遇到此问题，大致是mysql版本不通造成的，以下是解决办法：
mysql>UPDATE mysql.user SET Password = OLD_PASSWORD(‘yourpass’) WHERE Host = ‘localhost’ AND User = ‘username’;
mysql>FLUSH PRIVILEGES;

这里是mysql官方的解释！
http://dev.mysql.com/doc/refman/5.0/en/old-client.html

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