使用TOMCAT5.5连接池连接mysql(解决Cannot create JDBC driver of class '' for connect URL 'null')

前天按照智囊团的视频做工程中间出现了很多错误 让人头痛 有Cannot create JDBC driver of class '' for connect URL 'null'Name jdbc not bound in context等昨天查了一天 改了半天 今天终于弄好了 原因有几个1。包没加全。myeclipse有些包不会自动加载进lib内 需要自己手动加载 比如：struts的包2。server.xml配置不对 网上有人说TOMCAT 5。0和TOMCAT 5。5的resource语法有点变化我这里的配置是

<GlobalNamingResources>

<Context path="/zhinangtuan"

docBase="D:/javaproject/MyZhiNangTuanDemo/WebRoot" debug="5"

reloadable="true" crossContext="true">

<Logger

className="org.apache.catalina.logger.FileLogger"

prefix="localhost_MysqlTest_log." suffix=".txt" timestamp="true" />

<Resource name="jdbc/mldn" auth="Container"

type="javax.sql.DataSource"

factory="org.apache.commons.dbcp.BasicDataSourceFactory"

maxActive="100" maxIdle="30" maxWait="5000" username="root"

password="root" driverClassName="org.gjt.mm.mysql.Driver"

url="jdbc:mysql://localhost:3306/mldn" />

</Context>

</GlobalNamingResources>

<DefaultContext>

<ResourceLink global="jdbc/mldn" name="jdbc/mldn"

type="javax.sql.DataSource" />

</DefaultContext>

3.web.xml和WEB-INF/lib/classes下的applicationContext.xml配置出现问题我这里的配置为applicationContext.xml:

<bean id="hibernateInterceptor"

class="org.springframework.orm.hibernate3.HibernateInterceptor">

<property name="sessionFactory">

<ref bean="sessionFactory" />

</property>

</bean>

<bean id="sessionFactory"

class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

<property name="dataSource">

<ref bean="dataSource" />

</property>

<property name="hibernateProperties">

<props>

<prop key="hibernate.dialect">

org.hibernate.dialect.MySQLDialect

</prop>

<!-- 表示允许自动提交 -->

<prop key="hibernate.connection.autocommit">true</prop>

<!-- 显示sql语句 -->

<prop key="hibernate.show_sql">true</prop>

</props>

</property>

<property name="mappingResources">

<list>

<value>org/lxh/myzngt/vo/Admin.hbm.xml</value>

<value>org/lxh/myzngt/vo/User.hbm.xml</value>

<value>org/lxh/myzngt/vo/Item.hbm.xml</value>

<value>org/lxh/myzngt/vo/Subitem.hbm.xml</value>

<value>org/lxh/myzngt/vo/Answer.hbm.xml</value>

<value>org/lxh/myzngt/vo/Question.hbm.xml</value>

</list>

</property>

</bean>

<bean id="hibernateTemplate"

class="org.springframework.orm.hibernate3.HibernateTemplate">

<property name="sessionFactory">

<ref bean="sessionFactory" />

</property>

</bean>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
<filter>

<filter-name>encoding</filter-name>

<filter-class>

org.lxh.myzngt.filter.EncodingFilter

</filter-class>

<init-param>

<param-name>charset</param-name>

<param-value>gbk</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encoding</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<filter>

<filter-name>userlogin</filter-name>

<filter-class>

org.lxh.myzngt.filter.UserLoginFilter

</filter-class>

</filter>

<filter-mapping>

<filter-name>userlogin</filter-name>

<url-pattern>/jsp/user/*</url-pattern>

</filter-mapping>

<filter-mapping>

<filter-name>userlogin</filter-name>

<url-pattern>/jsp/ques/*</url-pattern>

</filter-mapping>

<filter>

<filter-name>adminlogin</filter-name>

<filter-class>

org.lxh.myzngt.filter.AdminLoginFilter

</filter-class>

</filter>

<filter-mapping>

<filter-name>adminlogin</filter-name>

<url-pattern>/jsp/admin/*</url-pattern>

</filter-mapping>

<filter>

<filter-name>opensession</filter-name>

<filter-class>

org.springframework.orm.hibernate3.support.OpenSessionInViewFilter

</filter-class>

</filter>

<filter-mapping>

<filter-name>opensession</filter-name>

<url-pattern>*.do</url-pattern>

</filter-mapping>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>

/WEB-INF/classes/applicationContext.xml

</param-value>

</context-param>

<servlet>

<servlet-name>context</servlet-name>

<servlet-class>

org.springframework.web.context.ContextLoaderServlet

</servlet-class>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet>

<servlet-name>action</servlet-name>

<servlet-class>

org.apache.struts.action.ActionServlet

</servlet-class>

<init-param>

<param-name>config</param-name>

<param-value>/WEB-INF/struts-config.xml</param-value>

</init-param>

<init-param>

<param-name>debug</param-name>

<param-value>3</param-value>

</init-param>

<init-param>

<param-name>detail</param-name>

<param-value>3</param-value>

</init-param>

<load-on-startup>0</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>30</session-timeout>

</session-config>

<resource-ref>

<description>DB Connection</description>

<res-ref-name>jdbc/mldn</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

</web-app>

4。修改/conf/Catalina/localhost目录下建立一个xml文件,名称为你所发布的web应用的名称．xml,(如testpool.xml)打开添加内容如下:

<?xml version="1.0" encoding="UTF-8"?>

<Context>

<Resource name="jdbc/mldn" auth="Container"

type="javax.sql.DataSource"

factory="org.apache.commons.dbcp.BasicDataSourceFactory"

maxActive="100" maxIdle="30" maxWait="5000" username="root"

password="root" driverClassName="org.gjt.mm.mysql.Driver"

url="jdbc:mysql://localhost:3306/mldn" />

</Context>

内容同conf/server.xml中配置少了这一步会报错：Cannot create JDBC driver of class '' for connect URL 'null'搜了n久后启动tomcat终于米报错 。大致原因 应该是数据源的 各个部分都需要配置映射。