tomcat6整合jbpm4.4报错javax/el/ExpressionFactory找不到的解决办法
?tomcat6跑jbpm4.4应用中，启动访问时正常成功，但是任何一个jsp页面时报一下错误：
javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/el/ExpressionFactory"org.apache.jasper.servlet.JspServlet.service(JspServlet.java:275)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:99)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
?
解决办法如下：
删除tomcat6/lib 下面的el-api.jar
把你的应用里的juel-api.jar剪贴到tomcat6/lib下， 注意应用下面不要留juel-api.jar了。
否则会报如下错误：
java.lang.ClassNotFoundException: javax.el.ELResolver
