web项目部署到tomcat 遇到ClassNotFound问题

遇到如下问题：

在将web项目部署到tomcat时，出现如下错误

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:126)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1099)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1043)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5284)
    at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5279)
    at java.util.concurrent.FutureTask$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)

修改步骤：

You need to add the "Maven Dependency" in the Deployement Assembly

• right click on your project and choose properties.
• click on Deployement Assembly.
• click add
• click on "Java Build Path Entries"
• select Maven Dependencies"
• click Finish.

That it!! rebuild and deploy again

大意：

在项目上点击 properties 

点击 Deploy Assembly

点击 add

点击  "Java Build Path Entries"

选择 ClassNotFound 的jar包（例如org.springframework.web.servlet.DispatcherServlet 存在的jar包 spring-webmvc ...）

如果有相同错误 ，按照步骤 一步步添加即可。