项目场景：

原本项目使用Tomcat7没有问题换到Tomcat6后启动项目会报错

问题描述：

javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving interface method “javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;” the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/login_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for the method’s defining class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:268)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:322)org.springframework.security.web.authentication.switchuser.SwitchUserFilter.doFilter(SwitchUserFilter.java:181)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:322) org.springframework.security.web.authentication.switchuser.SwitchUserFilter.doFilter(SwitchUserFilter.java:181) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:322)org.springframework.security.web.authentication.switchuser.SwitchUserFilter.doFilter(SwitchUserFilter.java:181)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116) org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334) org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125) org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)org.springframework.security.web.FilterChainProxyVirtualFilterChain.doFilter(FilterChainProxy.java:334)
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:184)
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:155)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
com.conac.framework.common.security.XssFilter.doFilter(XssFilter.java:58)

原因分析：

原因是项目中WEB-INF/lib中的三个jar包(juel.jar, juel-engine.jar, juel-impl.jar)和tomcat6下lib中jar包(el-api.jar)冲突

解决方案：

将juel.jar, juel-engine.jar, juel-impl.jar这三个包复制到tomcat6下lib中，并删除原来的el-api.jar，切记要把WEB-INF/lib中的juel.jar, juel-engine.jar, juel-impl.jar删除。不然还是要冲突。

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