每次重启eclipse正常，重新启动Tomcat时候出现如下问题：

每次只有重启eclipse--》打包---》启动Tomcat才能正常启动项目，假如将Tomcat服务停了不重启eclipse，就会出现如下问题：

严重: ContainerBase.addChild: start: 

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ms]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
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:649)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:672)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1862)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getClassLoader()Ljava/lang/ClassLoader;
at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:90)
at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1546)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1268)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:876)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:374)
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:5378)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more


十二月 18, 2014 8:54:17 上午 org.apache.catalina.startup.HostConfig deployDescriptor
严重: Error deploying configuration descriptor D:\app\Tomcat7\conf\Catalina\localhost\ms.xml
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ms]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:672)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1862)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)


十二月 18, 2014 8:54:17 上午 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deployment of configuration descriptor D:\app\Tomcat7\conf\Catalina\localhost\ms.xml has finished in 468 ms
十二月 18, 2014 8:54:17 上午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-8080"]
十二月 18, 2014 8:54:17 上午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-bio-8009"]
十二月 18, 2014 8:54:17 上午 org.apache.catalina.startup.Catalina start

信息: Server startup in 541 ms

我怀疑是环境变量配置的问题！