救救我吧!!为什么引入了jar包却出NoClassDefFoundError
出错信息:
2011-7-11 17:04:02 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.NoClassDefFoundError: org/apache/el/ExpressionFactoryImpl
at org.apache.jasper.compiler.JspUtil.<clinit>(JspUtil.java:68)
at org.apache.jasper.JspCompilationContext.getServletClassName(JspCompilationContext.java:374)
at org.apache.jasper.JspCompilationContext.getClassFileName(JspCompilationContext.java:514)
at org.apache.jasper.compiler.Compiler.isOutDated(Compiler.java:445)
at org.apache.jasper.compiler.Compiler.isOutDated(Compiler.java:392)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:326)
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 com.ieslab.eim.login.service.AccessFilter.doFilter(AccessFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.ieslab.eim.common.filter.SetCharEncodingFilter.doFilter(SetCharEncodingFilter.java:17)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
在网上查的事jasper.jar 中没有ExpressionFactoryImpl.class文件。需要把jasper-el.jar和jasper-jdt.jar引入。我把他们都引入了,怎么还出这个错误呢。我用的是eclipse Helios Release 和tomcat 6.0。我把jasper-el.jar 解压了发现里面明明有ExpressionFactoryImpl.class文件。有没有高手知道怎么办啊?