eclipse 包含 Tomcat 7（当 servlet 项目时）在 45 秒内没有启动......并且增加超时没有解决

Tomcat 7 (when a servlet project) is included is not staring within 45 seconds...and increasing the timeout does not solve

提问by Sourav

Tomcat 7 is not starting when a web application(with a servlet) is attempted to run.The server works well when i only have a html page.But when i try to add a servlet and add it to tomcat.Then the server does not start and gives an error saying "Tomcat 7 didn't start in 45 seconds". I increased the timeout but nothing happened.Please help me solve this problem

尝试运行 Web 应用程序（带有 servlet）时，Tomcat 7 未启动。当我只有一个 html 页面时，服务器运行良好。但是当我尝试添加 servlet 并将其添加到 tomcat 时，服务器没有启动并给出错误消息“Tomcat 7 未在 45 秒内启动”。我增加了超时但什么也没发生。请帮我解决这个问题

The Console says :

控制台说：

"23 Jan, 2012 1:43:44 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in                  production environments was not found on the java.library.path: C:\Program Files (x86)\Java\jdk1.7.0\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jdk1.6.0_23/jre/bin/server;C:/Program Files/Java/jdk1.6.0_23/jre/bin;C:/Program Files/Java/jdk1.6.0_23/jre/lib/amd64;C:\Program Files (x86)\Java\jdk1.7.0\jre\bin;F:\SOFTWARES\Eclipse Indigo\eclipse;
23 Jan, 2012 1:43:44 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property     'source' to 'org.eclipse.jst.jee.server:Basic' did not find a matching property.
23 Jan, 2012 1:43:44 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-80"]
23 Jan, 2012 1:43:44 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-9999"]
23 Jan, 2012 1:43:44 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 717 ms
23 Jan, 2012 1:43:44 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
23 Jan, 2012 1:43:44 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.23
23 Jan, 2012 1:43:45 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component     [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Basic]]
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1100)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:674)
    Caused by: org.apache.catalina.LifecycleException: Failed to start component     [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Basic]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    ... 7 more
    Caused by: java.lang.UnsupportedClassVersionError: Simple : Unsupported major.minor version 51.0 (unable to load class Simple)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2827)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1160)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1655)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:108)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:58)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:338)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:831)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:302)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5148)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more
23 Jan, 2012 1:43:45 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to     start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1100)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
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:727)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:624)
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:623)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
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$StartChild.call(ContainerBase.java:1525)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:674)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1108)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more
23 Jan, 2012 1:43:45 PM org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8000]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.startup.Catalina.start(Catalina.java:624)
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:623)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:450)
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:727)
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:1108)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:291)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
23 Jan, 2012 1:43:45 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 313 ms "    '

回答by JB Nizet

If you just copied the error message of the cause of the exception into Google, you would have found the problem. "Unsupported major.minor version 51.0"means that you compiled the classes with JDK7, but try to deploy and run it with a previous version of the JDK or JRE. Start your tomcat with JDK7, or change the JDK you're using to compile your classes.

如果你只是将异常原因的错误信息复制到谷歌中，你就会发现问题。“不支持的major.minor 版本51.0”表示您使用JDK7 编译类，但尝试使用JDK 或JRE 的先前版本部署和运行它。使用 JDK7 启动您的 tomcat，或者更改您用来编译类的 JDK。

Side note: your class seems to be named Simple and to be in the default package. This ie a bad practice that will cause all sorts of problems. Always put your classes in a package.

旁注：您的类似乎被命名为 Simple 并且位于默认包中。这是一种不好的做法，会导致各种问题。始终将您的课程放在一个包中。

回答by SJX

Check the configuration in the file servers.xml in the Package Explorer under Servers in Eclipse. When you open this file in Design-mode, you can see the different Contexts-configs. For you start there should be an entry. Check this Context entry: the docBase, path and source should refer to your project.

检查 Eclipse Servers 下 Package Explorer 中文件 servers.xml 中的配置。当您在设计模式下打开此文件时，您可以看到不同的 Contexts-configs。对于你开始应该有一个条目。检查此上下文条目：docBase、路径和源应指代您的项目。