org.apache.catalina.loader.StandardClassLoader@1af33d6

严重: Error loading WebappClassLoader
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@1af33d6

java.lang.ClassNotFoundException:
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1083)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2016-6-26 9:12:40 org.apache.catalina.core.StandardWrapperValve invoke
严重: Allocate exception for servlet hello
java.lang.ClassNotFoundException:
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1083)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:806)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2016-6-26 9:12:41 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:41 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:41 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:42 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:42 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:42 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet hello is currently unavailable
2016-6-26 9:12:42 org.apache.catalina.core.StandardWrapperValve invoke

信息: Servlet hello is currently unavailable

解决：

网上搜了几种解决方案：

1、关掉myeclipse，把原来的tomcat换掉，如果是安装版的就卸载，重新放一个tomcat，启动myeclipse，配置tomcat，部署，再启动tomcat，一切OK。
2、之前jar包我是通过Build path -> Configure build path-> Add External JARs的方式添加的，程序编译，Tomcat启动都很正常，没有错误。可是一访问jsp页面就报上述错误。苦思不得其解，但看了错误信息说是找不到org.springframework.web.servlet.DispatcherServlet类，所以我就干脆将spring.jar,spring-webmvc.jar等jar包通通手工添加到/WEB-INF/lib目录下，并且将default output folder值改为projectName/WebContent/WEB-INF/classes 问题就得以解决了。

这两种解决方案试了都不行，但是大体了解到可能是jar包没有导入进去，所以进了eclipse的工程目录，找到对应的存放jar包的目录：.metadata\.plugins\org.eclipse.wst.server.core\tmp3\wtpwebapps\jsf2nd\WEB-INF\lib，发现果然少了两个jar包，将之放入后问题就解决了。

错误原因：至今未能查明究竟是哪个地方出错了才使得eclipse不能将jar包放到eclipse的tomcat插件下面。

可能的几个原因：
1、我的eclipse选择的默认编译是jdk1.5，而这个项目用的是Tomcat6,
2、我的Eclipse里面默认设置的tomcat的编译器也是1.5

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