servlet 与 tomcat版本不匹配的问题

严重: Failed to process JAR found at URL [/StudentLeave] for ServletContainerInitializers for context with name [{1}]
java.io.IOException: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServletContainerInitializer to javax.servlet.ServletContainerInitializer
    at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:201)
    at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:157)
    at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1577)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1281)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5405)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:677)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1942)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException: Cannot cast org.springframework.web.SpringServletContainerInitializer to javax.servlet.ServletContainerInitializer
    at java.lang.Class.cast(Class.java:3369)
    at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:193)
    ... 19 more

最近有个项目启动总是报这个错误，tomcat版本使用的是Apache Tomcat/7.0.65，（以前能正常运行，后来使用该项目出现此问题，把tomcat重新解压后解决了）  。

经过网上查询知道是servlet jar包版本和tomcat不匹配的原因， 一开始把servlet降到2.5 ，又会遇到其他问题， 后来干脆把tomcat 升级到8.0.24版才OK，（我JDK使用的是jdk1.8.0_91版本）。

网上也有其他人遇到这种问题， 有的是降servlet版本，配合tomcat7.0 + jdk1.7。 所以都统一使用最新版本就不会有这么多问题。

    <!-- 添加Servlet支持 -->
      <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
<!--     <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency> -->