Java开发网 - 求助：为什么taglib的class不能load？？

Topic: 求助：为什么taglib的class不能load？？

1.求助：为什么taglib的class不能load？？

Posted by: ytt613
Posted on: 2005-05-09 17:47

我学习taglib，按照http://dev.csdn.net/develop/article/48/48301.shtm做。

我做好了WEB-INF/classes里面的class和WEB-INF/tlds里面的tld，把显示taglib的页面直接放在ROOT下。这个报错是怎么回事呢？
请教！感谢！

Tomcat报错：
exception

org.apache.jasper.JasperException: /testtag.jsp(8,0) Unable to load class hello
  at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:49)
  at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:383)
  at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:174)
  at org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:667)
  at org.apache.jasper.compiler.Parser.parseElements(Parser.java:759)
  at org.apache.jasper.compiler.Parser.parse(Parser.java:77)
  at org.apache.jasper.compiler.ParserController.parse(ParserController.java:157)
  at org.apache.jasper.compiler.ParserController.parse(ParserController.java:111)
  at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:183)
  at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
  at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:427)
  at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:142)
  at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
  at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
  at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
  at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
  at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
  at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
  at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
  at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
  at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
  at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
  at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
  at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
  at java.lang.Thread.run(Thread.java:534)