运行的第一个Struts2程序出错，但是能得到正确的结果，以下是具体错误信息，原因是什么，要怎么解决

Question

严重: Exception fixing docBase for context [/myapp] 
java.io.IOException: 设备未就绪。
at java.io.WinNTFileSystem.canonicalize0(Native Method)
at java.io.Win32FileSystem.canonicalize(Unknown Source)
at java.io.File.getCanonicalPath(Unknown Source)
at org.apache.catalina.startup.ContextConfig.fixDocBase(ContextConfig.java:872)
at org.apache.catalina.startup.ContextConfig.init(ContextConfig.java:1021)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:279)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.StandardContext.init(StandardContext.java:5707)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4449)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2012-6-7 2:45:41 org.apache.catalina.core.StandardContext resourcesStart
严重: Error starting static Resources
java.lang.IllegalArgumentException: Document base D:\myapp does not exist or is not a readable directory
at org.apache.naming.resources.FileDirContext.setDocBase(FileDirContext.java:142)
at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4320)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4489)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2012-6-7 2:45:41 org.apache.catalina.core.StandardContext start
严重: Error in resourceStart()
2012-6-7 2:45:42 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2012-6-7 2:45:42 org.apache.catalina.core.StandardContext start
严重: Context [/myapp] startup failed due to previous errors
2012-6-7 2:45:42 org.apache.catalina.core.StandardContext stop
信息: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/myapp] has not been started
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor host-manager.xml
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory docs
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory examples
2012-6-7 2:45:42 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2012-6-7 2:45:42 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory myapps
2012-6-7 2:45:42 org.apache.tomcat.util.modeler.Registry registerComponent
严重: Null component Catalina:type=JspMonitor,name=jsp,WebModule=//localhost/myapps,J2EEApplication=none,J2EEServer=none
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory
严重: Error deploying web application directory myapps
java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class test.HelloWorld)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2822)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:108)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:58)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:297)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1078)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4612)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ROOT
2012-6-7 2:45:42 org.apache.catalina.startup.HostConfig deployDirectory
2012-6-7 2:45:46 org.apache.catalina.startup.Catalina start
信息: Server startup in 4262 ms

Answer 1

Document base D:\myapp does not exist or is not a readable directory
这句话说得明白

Answer 2

看下你D盘下有没有myapp 这个目录

Answer 3

java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class test.HelloWorld)
好像有类的版本编译不兼容哦，你的IDE jdk是不是和运行的jdk版本不一样啊？

Answer 4

＋＋　应该是Tomcat_Home 下的jdk版本比IDE下的低