开发一测试web app，部署到云服务器Tomat上，总是报以下错误，但在本地调试却没问题，后来确认是web.xml少了webAppRootKey定义，多个项目冲突造成，Mark一下。
28-Apr-2016 11:00:01.152 SEVERE [localhost-startStop-10] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyWebTest]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:940)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1738)
at java.util.concurrent.Executors$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: org.apache.catalina.LifecycleException: Failed to start component [[email protected]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4844)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4974)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
Caused by: org.apache.catalina.LifecycleException: Failed to initialize component [[email protected]]
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139)
at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:690)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 13 more
Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: error in opening zip file
at org.apache.catalina.webresources.JarResourceSet.initInternal(JarResourceSet.java:96)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
... 16 more
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:220)
at java.util.zip.ZipFile.<init>(ZipFile.java:150)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at org.apache.catalina.webresources.JarResourceSet.initInternal(JarResourceSet.java:88)
... 17 more
web.xml中不同项目应定义各自不同的webAppRootKey值，如果不定义，将会缺省为“webapp.root”，导致冲突。
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>mywebtest.root</param-value>
</context-param>