Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV

1.将maven项目转为一般web项目,在项目上右键maven-->disable maven nature,然后clean,部署,启动

2.成功部署在tomcat6上,启动无报错.但是访问是报如下错误

2016-8-24 19:36:32 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet jsp threw exceptionorg.apache.jasper.JasperException: /index.jsp(2,0) Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLVat org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:88)at org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:300)at org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:333)at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:442)at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1397)at org.apache.jasper.compiler.Parser.parse(Parser.java:130)at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)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 com.sunshine.monitor.comm.filter.AutoLoginFilter.doFilter(AutoLoginFilter.java:94)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)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:291)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)at java.lang.Thread.run(Thread.java:619)

Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.standard.tlv.JstlCoreTLV 无法加载TagLibraryValidator类.

这个错误涉及到的相关jar有standard,jstl,servlet-api,jsp-api.我的项目引入了standard.jar和jstl.jar,在tomcat的lib下有servlet-api.jar和jsp-api.jar.首先要注意的版本匹配问题,如图所示:

我按上图所示的版本都试了一次,并且修改了project facets,依旧报同样的错误.

网上说,编译时使用的是外部jar,运行时也是使用的外部jar,所以要将jstl.jar和standard.jar放到tomcat的lib下,并删除项目下的这两个jar.我找着做了,没效果.

最后,我将tomcat的example那个里面的jstl.jar和standard.jar这两个拷到项目里面,并将项目里面的servlet-api.jar和jsp-api.jar删除,tomcat的lib下的这两个jar包保留.这样就可以访问成功了.