像上一篇文章，我們提到的，IDEA MAVEN struts專案中，如果我們把 struts.xml 檔案放在 src 目錄下，編譯的時候，將無法打包到 *\WEB-INF\classes* 路徑下，執行程式的時候自然就會報錯(404的錯誤，如下圖：)

建議大家先看目錄，再按步驟操作。重點內容

1. struts.xml 檔案無法打包到 \WEB-INF\classes\

2. 無法打包 struts.xml 檔案 導致執行報錯

控制檯異常資訊，見附錄。

3.MAVEN專案 打包到指定路徑 解決方案

設定步驟如下：

FILE -> Project Structure

這樣我們便可以設定 將 指定檔案 打包到指定目錄了。

4.設定後，檢視打包結果

5.附錄

找不到 struts.xml ，控制檯報錯如下：

 org.apache.catalina.LifecycleException: Failed to start component [org.apache
 
.catalina.webresources.StandardRoot@4347694b]
    at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
    at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4758
 
)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4893)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:740)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:716)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:620)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1832)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
    at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:530)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:429)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1622)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:304)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1172)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1394)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1398)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1366)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: The main resource set specified [D:\MyProject\java\_project\mavenstruts2\target\mavenstruts2] is not valid
    at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:749)
    at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:706)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    ... 22 more