Bad version number in .class file引发的问题 -

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Bad version number in .class file引发的问题

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java

上午学习了下flex的基础知识。下午就开始搭建项目环境。
svn没有权限，只有用优盘拷贝项目文件了。拷贝，导入工程，用了我快半个小时。
自此开始了我下午的惨痛经历。
导入项目到myeclipse，拷贝的工程。很多红叉叉，几分钟搞定之后。发布到tomcat—》启动
各种debug弹出来。

Resume N次过后。启动完毕。
Ie中访问工程，登录框出来了。输入用户名密码，点击登录。出现如下问题

 [05-21 18:07:56.296 INFO  SystemProperties.<init>():30] Loaded file:/D:/work%20pro/apache-tomcat-5.5.20/webapps/TINMS/WEB-INF/classes/metar-security.properties
[05-21 18:07:56.531 ERROR DispatchAction.dispatchMethod():297] Dispatch[/login] to method 'login' returned an exception
java.lang.reflect.InvocationTargetException
	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.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
	at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
	at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.UnsupportedClassVersionError: Bad version number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:869)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1322)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at com.metarnet.security.manager.UserManager.getOnlineUserIDList(UserManager.java:533)
	at com.qtby.tinms.login.service.LoginManager.CheckUser(LoginManager.java:54)
	at com.qtby.tinms.login.action.LoginAction.login(LoginAction.java:123)
	... 31 more
[05-21 18:07:56.546 WARN  RequestProcessor.processException():516] Unhandled Exception thrown: class javax.servlet.ServletException
[05-21 18:07:56.546 ERROR StandardWrapperValve.invoke():253] Servlet.service() for servlet action threw exception
java.lang.UnsupportedClassVersionError: Bad version number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:869)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1322)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at com.metarnet.security.manager.UserManager.getOnlineUserIDList(UserManager.java:533)
	at com.qtby.tinms.login.service.LoginManager.CheckUser(LoginManager.java:54)
	at com.qtby.tinms.login.action.LoginAction.login(LoginAction.java:123)
	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.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
	at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
	at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Unknown Source)

java.lang.UnsupportedClassVersionError: Bad version number in .class file

错误的jdk版本。
好了，想办法解决把。我的jdk是1.6的而Compiler Compliance level默认是5.0
进到当前工程的属性后，选择"Java Compiler"进去后将"Compiler Compliance level"改成当前jdk的版本
确定，开始rebuilding。

此过程大概需要10分钟。（当中开了一个Flash Builder机器慢的快马赛克了，果断关掉还是用了10分钟，很郁闷）
然后，再启动tomcat。

到这就没了。这不比没改版本之前更糟吗！？果断，删除tomcat 的work，删除webapps下的工程。重新发布（发布也得10分钟），问题依然如此。
好吧，删除工程，重复以上操作一次。结果还是这样。
从svn上下载工程，再重复以上操作一次。还是这样。
继续百度，无意间看到了http://sucre.blog.51cto.com/1084905/353608
原来我的tomcat默认的一直都是myeclipse的jre包。而不是自己配置的jdk1.6

选上jdk1.6.重启，一切正常。
这个问题卡了我一下午。
总结：项目jdk版本与以下三个地方决定
1.Window ->Preferences ->Java ->compiler中的compiler compliance level对应的下拉菜单中选择JDK6.0版本（之前是5.0）
2.Window -> Preferences ->Java ->Installed JRES选择安装的jdk1.6，（之前是MyEclipse6.5，相当于5.0）（注意不要选jre）
3.Window -> Preferences ->MyEclipse -> Servers ->Tomcat -> Tomcat 5.x -->JDK中的Tomcat JDK name选择与步骤2相同
在我选择compiler compliance level为6.0时，因为tomcat默认的是MyEclipse6.5（相当于5.0），所以还没有加载工程时就会报错。
如果早一点查资料，不用自己一股脑的删除，重启，很快就能解决问题。还是没有找到问题出在哪。
详细的可以看这里：http://hellosure.iteye.com/blog/868729