【Tomcat】熱部署的遺留配置致使服務器沒法啓動

一、問題描述：

今天用myeclipse寫了個小demo，而後用Tomcat7 部署了，接着點擊啓動服務器，服務器竟然報錯：

嚴重: Error starting static Resources

java.lang.IllegalArgumentException : Document base H:\software\apache-tomcat\apache-tomcat-7.0.52\webapps\lemon does not exist or is not a readable directory

       at org.apache.naming.resources.FileDirContext.setDocBase( FileDirContext.java:136 )

       at org.apache.catalina.core.StandardContext.resourcesStart( StandardContext.java:5089 )

       at org.apache.catalina.core.StandardContext.startInternal( StandardContext.java:5269 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1559 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1549 )

       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 )

四月 22, 2017 6:57:41 下午 org.apache.catalina.core.ContainerBase startInternal

嚴重: A child container failed during start

java.util.concurrent.ExecutionException : org.apache.catalina.LifecycleException : Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/lemon]]

       at java.util.concurrent.FutureTask.report( FutureTask.java:122 )

       at java.util.concurrent.FutureTask.get( FutureTask.java:188 )

       at org.apache.catalina.core.ContainerBase.startInternal( ContainerBase.java:1123 )

       at org.apache.catalina.core.StandardHost.startInternal( StandardHost.java:799 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1559 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1549 )

       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: org.apache.catalina.LifecycleException : Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/lemon]]

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:154 )

       ... 6 more

Caused by: org.apache.catalina.LifecycleException : Error in resourceStart()

       at org.apache.catalina.core.StandardContext.startInternal( StandardContext.java:5270 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       ... 6 more

四月 22, 2017 6:57:41 下午 org.apache.catalina.core.ContainerBase startInternal

嚴重: A child container failed during start

java.util.concurrent.ExecutionException : org.apache.catalina.LifecycleException : Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

       at java.util.concurrent.FutureTask.report( FutureTask.java:122 )

       at java.util.concurrent.FutureTask.get( FutureTask.java:188 )

       at org.apache.catalina.core.ContainerBase.startInternal( ContainerBase.java:1123 )

       at org.apache.catalina.core.StandardEngine.startInternal( StandardEngine.java:300 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       at org.apache.catalina.core.StandardService.startInternal( StandardService.java:443 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       at org.apache.catalina.core.StandardServer.startInternal( StandardServer.java:731 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       at org.apache.catalina.startup.Catalina.start( Catalina.java:689 )

       at sun.reflect.NativeMethodAccessorImpl.invoke0( Native Method )

       at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:57 )

       at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 )

       at java.lang.reflect.Method.invoke( Method.java:606 )

       at org.apache.catalina.startup.Bootstrap.start( Bootstrap.java:321 )

       at org.apache.catalina.startup.Bootstrap.main( Bootstrap.java:455 )

Caused by: org.apache.catalina.LifecycleException : Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:154 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1559 )

       at org.apache.catalina.core.ContainerBase$StartChild.call( ContainerBase.java:1549 )

       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: org.apache.catalina.LifecycleException : A child container failed during start

       at org.apache.catalina.core.ContainerBase.startInternal( ContainerBase.java:1131 )

       at org.apache.catalina.core.StandardHost.startInternal( StandardHost.java:799 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       ... 6 more

四月 22, 2017 6:57:41 下午 org.apache.catalina.startup.Catalina start

嚴重: The required Server component failed to start so Tomcat is unable to start.

org.apache.catalina.LifecycleException : Failed to start component [StandardServer[8005]]

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:154 )

       at org.apache.catalina.startup.Catalina.start( Catalina.java:689 )

       at sun.reflect.NativeMethodAccessorImpl.invoke0( Native Method )

       at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:57 )

       at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:43 )

       at java.lang.reflect.Method.invoke( Method.java:606 )

       at org.apache.catalina.startup.Bootstrap.start( Bootstrap.java:321 )

       at org.apache.catalina.startup.Bootstrap.main( Bootstrap.java:455 )

Caused by: org.apache.catalina.LifecycleException : Failed to start component [StandardService[Catalina]]

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:154 )

       at org.apache.catalina.core.StandardServer.startInternal( StandardServer.java:731 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       ... 7 more

Caused by: org.apache.catalina.LifecycleException : Failed to start component [StandardEngine[Catalina]]

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:154 )

       at org.apache.catalina.core.StandardService.startInternal( StandardService.java:443 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       ... 9 more

Caused by: org.apache.catalina.LifecycleException : A child container failed during start

       at org.apache.catalina.core.ContainerBase.startInternal( ContainerBase.java:1131 )

       at org.apache.catalina.core.StandardEngine.startInternal( StandardEngine.java:300 )

       at org.apache.catalina.util.LifecycleBase.start( LifecycleBase.java:150 )

       ... 11 more

二、問題分析：

Document base H:\software\apache-tomcat\apache-tomcat-7.0.52\webapps\lemon does not exist or is not a

這句話告訴咱們在tomcat的webapps下找不到lemon這個項目 看了看 確實沒有. 

 

此時，我能想到的就是work這個臨時文件夾，通常出錯都是這個臨時文件夾搞的鬼，可是delete掉後，問題依舊。

 

思來想去，想起了eclipse的workspace下的.metadata下的plugins內的插件org.eclipse.wst.server.core下有個配置文件servers.xml是指定部署項目的相關配置.

 

因而，我就想myeclipse通常是部署在真實的tomcat上，應該會修改 tomcat的配置文件，所以我找到了tomcat的配置文件server.xml

 

打開發現，

 

三、問題解決：

查了下context標籤的意思，原來，

<!-- tomcat配置的虛擬路徑 docBase="應用的實際目錄" 若是用myclipse編寫 則是webRoot Tomcat熱部署 -->

      <!-- <Context docBase="lemon" path="/lemon" reloadable="true" source="org.eclipse.jst.j2ee.server:lemon"/> -->

最後，我分析多是由於咱們在用myeclipse開發時，因爲某種誤操做致使myeclipse沒有及時去更新server.xml配置文件，致使遺留了一些無效配置。

刪掉最後的那句<!-- <Context docBase="lemon" path="/lemon" reloadable="true" source="org.eclipse.jst.j2ee.server:lemon"/> -->，服務器正常啓動!