springMVC项目启动报错

springMVC 项目启动，出现奇怪问题，已经耽误好几天，求大神帮忙！

严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/h5Platform]]
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
at java.util.concurrent.FutureTask.get(FutureTask.java:83)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1122)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1574)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1564)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/h5Platform]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 7 more
Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/servlet/ServletContext"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1229)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1692)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1573)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5520)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more

这是web.xml

<?xml version="1.0" encoding="UTF-8"?>
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
Archetype Created Web Application

<!-- 读取spring配置文件 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:conf/spring.xml;
        classpath:conf/spring-mybatis.xml
    </param-value>
</context-param>
<!-- 设计路径变量值 -->
<context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>springmvc.root</param-value>
</context-param>


<!-- Spring字符集过滤器 -->
<filter>
    <filter-name>SpringEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>GBK</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>SpringEncodingFilter</filter-name>
    <url-pattern>*</url-pattern>
</filter-mapping>

<!-- 日志记录 -->
<context-param>
    <!-- 日志配置文件路径 -->
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:conf/log4j.properties</param-value>
</context-param>
<context-param>
    <!-- 日志页面的刷新间隔 -->
    <param-name>log4jRefreshInterval</param-name>
    <param-value>6000</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- springMVC核心配置 -->
<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:conf/spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<!-- 错误跳转页面 -->
<error-page>
    <!-- 路径不正确 -->
    <error-code>404</error-code>
    <location>/WEB-INF/errorpage/404.jsp</location>
</error-page>
<error-page>
    <!-- 没有访问权限，访问被禁止 -->
    <error-code>405</error-code>
    <location>/WEB-INF/errorpage/405.jsp</location>
</error-page>
<error-page>
    <!-- 内部错误 -->
    <error-code>500</error-code>
    <location>/WEB-INF/errorpage/500.jsp</location>
</error-page>