由于要是使用分页功能，git有一款非常好的分页插件pagehelper官网：
https://github.com/pagehelper/
根据文档，maven导入，
<PageHelper.version>5.1.10</PageHelper.version>

com.github.pagehelper pagehelper ${PageHelper.version}

配置拦截器（此例用在spring中的SqlSessionFactoryBean配置，文档有详细的配置信息）：

    <property name="plugins">
        <array>
            <bean class="com.github.pagehelper.PageInterceptor">
                <property name="properties">
                    <!--使用下面的方式配置参数，一行配置一个 -->
                    <value>
                        <!--params=value1-->
                        <!--helperDialect=mysql //指定分页使用mysql数据库-->
                        reasonable=true   <!--合理化分页-->
                    </value>
                </property>
            </bean>
        </array>
    </property>

问题重点：
配置后pageHelper后 ，测试数据没问题，但是用tomcat启动报错：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘empController’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘empServiceImpl’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘empDao’ defined in file [D:\java\item\oa\target\oa-1.0-SNAPSHOT\WEB-INF\classes\com\de\dao\EmpDao.class]: Cannot resolve reference to bean ‘sqlSessionFactory’ while setting bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [applicationContext.xml]: Cannot create inner bean ‘com.github.pagehelper.PageInterceptor#7cddc3db’ of type [com.github.pagehelper.PageInterceptor] while setting bean property ‘plugins’ with key [0]; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.github.pagehelper.PageInterceptor] for bean with name ‘com.github.pagehelper.PageInterceptor#7cddc3db’ defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.github.pagehelper.PageInterceptor

总的来说就是找不到nested exception is java.lang.ClassNotFoundException: com.github.pagehelper.PageInterceptor，解决问题步骤：
一般这种编译测试通过，启动tomcat报错ClassNotFoundException：xxx，
首先看一下tomcat打包的依赖：


发现并没有打包pagehelper

然后看一下项目结构：

发现war_exploded并没有将pageHelper打包，
发现问题那就简单了，把pagehelper放到lib就行，

重启tomcat 成功运行！