<Context  path="/demo" docBase="C:/tomcat-6.0.9/webapps/sonny.war " reloadable="true">                                                        
       <Resource name="jdbc/mysql" auth="Container" type="javax.sql.DataSource"                        
          maxActive="100" maxIdle="30" maxWait="10000"                                                                                username="root" password="root" driverClassName="com.mysql.jdbc.Driver"                 
          url="jdbc:mysql://127.0.0.1:3306/mydb"/>                                                             
</Context>
应该这样写
还有mysql密码最好设个,不然解析这个xml的时候会出问题,你先试试吧
以前我也遇到过你这样的问题