Java Web應用程序錯誤 - 無法理解它現在發生的原因

Question

我使用eclipse，並且可以構建webapp並將其部署到Jboss4.2.1。它以前工作，我沒有真正廣泛地改變任何事情，以使這個錯誤成爲現實。當我通過瀏覽器訪問Web應用程序時，我以前一直使用通用用戶名登錄，然後像往常一樣使用我的Web應用程序。

現在，當我通過瀏覽器訪問webapp時，此錯誤反覆出現，並且不會顯示任何內容。這裏是我收到的錯誤：

07:55:06,174 INFO [security] User '' attempting login via SiteMinder... 
07:55:06,174 INFO [security] User '' attempting login via SiteMinder... 
07:55:06,174 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception 
java.lang.LinkageError: Class javax/el/ExpressionFactory violates loader constraints 
    at org.apache.jsp.WEB_002dINF.jsp.layout.header_jsp._jspx_meth_c_005fset_005f0(header_jsp.java:207) 
    at org.apache.jsp.WEB_002dINF.jsp.layout.header_jsp._jspx_meth_c_005fif_005f0(header_jsp.java:179) 
    at org.apache.jsp.WEB_002dINF.jsp.layout.header_jsp._jspService(header_jsp.java:82) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) 
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) 
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) 
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) 
    at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:643) 
    at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:637) 
    at net.sourceforge.stripes.tag.layout.LayoutRenderTag.doEndTag(LayoutRenderTag.java:122) 
    at org.apache.jsp.WEB_002dINF.jsp.layout.layout_jsp._jspx_meth_stripes_005flayout_002drender_005f0(layout_jsp.java:796) 
    at org.apache.jsp.WEB_002dINF.jsp.layout.layout_jsp._jspx_meth_stripes_005flayout_002dcomponent_005f2(layout_jsp.java:759) 
    at org.apache.jsp.WEB_002dINF.jsp.layout.layout_jsp._jspService(layout_jsp.java:200) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687) 
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) 
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:505) 
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) 
    at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:643) 
    at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:637) 
    at net.sourceforge.stripes.tag.layout.LayoutRenderTag.doEndTag(LayoutRenderTag.java:122) 
    at org.apache.jsp.view.public_.login_jsp._jspService(login_jsp.java:335) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
    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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at net.sourceforge.stripes.controller.StripesFilter.doFilter(StripesFilter.java:180) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:112) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265) 
    at org.acegisecurity.ui.switchuser.SwitchUserProcessingFilter.doFilter(SwitchUserProcessingFilter.java:341) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107) 
    at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:229) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:229) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:286) 
    at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275) 
    at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149) 
    at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 
    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:230) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) 
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 
    at java.lang.Thread.run(Thread.java:595) 

任何幫助將不勝感激。

Answer 1

運行時類路徑很可能與重複的和/或不同版本的EL API的污染。

通常，EL API已經與servletcontainer/appserver一起提供。你應該在沒辦法複製/複製/移動它的庫到其他地方，如進入webapp的/WEB-INF/lib或更糟糕的JRE的/lib。從所有重複和/或不同版本化的類/ JAR文件中清除類路徑。否則可能會導致這樣的例外。

首發中一個常見的錯誤是即它們複製servletcontainer /應用程序服務器的庫爲/WEB-INF/lib，因爲他們在IDE中得到編譯錯誤（javax.servlet沒有發現等等）。複製庫是錯誤解決方案。您應該將服務器集成到同一個IDE中，並將IDE項目配置爲引用/關聯相關服務器，以便IDE將自動將其庫存放在項目的構建路徑中。

Answer 2

我敢肯定，你有，但重新啓動您的服務...

Answer 3

谷歌搜索表明，其他應用程序也有類似的問題，通常是由於一些與el庫的兼容性問題。您可能需要檢查。

Answer 4

雖然在完全不同的情況下，我也遇到了類似的異常，但它在這裏也應該是有效的。

通常這意味着您在classpath中有不止一個違規類。

我試着找出javax.el.E​​xpressionFactory.class是否存在多次。 （可能是它在服務器的lib以及應用程序庫中）