问题描述
没辙了。在建了个web工程就加了javax.servlet.jsp.jar这个包，按照自定义标签步骤都做好，在tomcat5.5下跑了起来，没问题，问题是换到tomcat6.0.33的版本居然报错了。死活查不了是什么原因。错误如下。 2011-12-13 10:16:31 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet jsp threw exceptionorg.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 31 in the generated java fileThe method getJspApplicationContext(ServletContext) is undefined for the type JspFactoryStacktrace: at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92) at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330) at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:321) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:877) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:594) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1675) at java.lang.Thread.run(Thread.java:662) 本来是在struts2的环境下想加入自己的自定义标签，无奈报错，后来才有这后面的工程。测试不同版本的tomcat居然还会不一样，晕死了。（5.5下成功，6.0报错），例子最简单的，想测通就ok，好继续后面的事。当然网上查了很多例子了，调通，很多说是包的问题，就是查不出了。第一次提问不太会什么规矩，还望多包涵
解决方案
原因很简单，你删掉你lib下的 javax.servlet.jsp.jar即可，因为tomcat6/lib里面有这个jar包，两个有冲突了 ！