Cannot create PoolableConnectionFactory Access denied for user 'root'@'localhost'
遇到这个错误可以在"
C:\Program Files\Apache Software Foundation\Tomcat 7.0\conf\server.xml"文件中查找: username="root"，将相关的password修改为正确的值就可以了。（其中粗体部分为安装路径。）
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
<Resource name="jdbc/webdb" auth="Container"
type="javax.sql.DataSource"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/webdb?characterEncoding=utf-8"
username="root"
password="root"
maxActive="200"
maxIdle="50"
maxWait="3000"/>
</GlobalNamingResources>