在新的tomcat中启动项目的GWT问题

Question

由于我使用的是新的，因此我在启动tomcat中的GWT项目时遇到了问题。 昨天我使用了一个tomcat实例，我在PC上安装了它作为一项服务，它运行良好。今天我卸载它，因为它没有startup.dat，我需要在eclipse中进行调试。

没关系......现在我通过startup.bat启动了tomcat并部署了我的战争。但是当我想开始时，我收到了一些错误。

 
> FAIL - Application at context path /WebApp could not be started 
FAIL - Encountered exception org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/WebApp]] 

我在卡塔琳娜日志中发现了这个。它可能会帮助你。

 
>14.03.2013 14:07:15 org.apache.catalina.core.ContainerBase addChildInternal 
SCHWERWIEGEND: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/WebApp]] 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) 
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) 
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) 
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977) 
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:542) 
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1462) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) 
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) 
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) 
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1445) 
    at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:301) 
    at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:208) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:213) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:662) 
Caused by: java.lang.UnsupportedClassVersionError: com/wn/retail/iscan/base/webservice/lane/generated/LaneStatus : Unsupported major.minor version 51.0 (unable to load class com.wn.retail.iscan.base.webservice.lane.generated.LaneStatus) 
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2892) 
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1172) 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558) 
    at java.lang.Class.getDeclaredMethods0(Native Method) 
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2427) 
    at java.lang.Class.getDeclaredMethods(Class.java:1791) 
    at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127) 
    at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:279) 
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:141) 
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67) 
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405) 
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881) 
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369) 
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5179) 
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    ... 40 more 
14.03.2013 14:07:15 org.apache.catalina.startup.HostConfig deployWAR 
SCHWERWIEGEND: Error deploying web application archive C:\Program Files\Apache Software Foundation\apache-tomcat-7.0.37\webapps\WebApp.war 
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/WebApp]] 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904) 
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) 
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) 
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977) 
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:542) 
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1462) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) 
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) 
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) 
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1445) 
    at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:301) 
    at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:208) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:213) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:662) 

Answer 1

通过你的日志会后有一个例外，这是

: Unsupported major.minor version 51.0 (unable to load class 
com.wn.retail.iscan.base.webservice.lane.generated.LaneStatus 

好像你正在使用JDK7对Tomcat编译和更低的版本。

请参阅维基百科代码

正在使用的类文件格式的主要版本号。

J2SE 7 = 51 (0x33 hex). 

由于所有建议现在看到thisone也How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version