title: java.lang.NoSuchMethodError: javax.el.ELResolver.invoke(Ljavax/el/ELContext;Ljava/lang/Object;Ljava/lang/Object; when using maven tomcat plugin
body: <p>i was running my JSF 2 application from external <strong>tomcat 6</strong> from <strong>eclipse</strong> 
  and everything was working fine
  but when i tried to use <strong>maven tomcat plugin</strong></p>
  
  <pre><code>mvn tomcat:run
  </code></pre>
  
  <p>i got the following exception on one of the pages:</p>
  
  <pre><code>java.lang.NoSuchMethodError: javax.el.ELResolver.invoke(Ljavax/el/ELContext;Ljava/lang/Object;Ljava/lang/Object;[Ljava/lang/Class;[Ljava/lang/Object;)Ljava/lang/Object;
      at com.sun.el.parser.AstValue.getValue(AstValue.java:111)
      at com.sun.el.parser.AstValue.getValue(AstValue.java:163)
      at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)
      at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
      at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
      at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
      at javax.faces.component.UIData.getValue(UIData.java:731)
      at javax.faces.component.UIData.getDataModel(UIData.java:1798)
      at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
      at javax.faces.component.UIData.setRowIndex(UIData.java:473)
      at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
      at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
      at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
      at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1754)
      at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
      at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
      at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
      at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
      at com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(PrettyViewHandler.java:163)
      at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
      at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
      at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
      at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118)
      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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
      at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:110)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
      at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:119)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
      at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
      at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169)
      at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
      at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
      at java.lang.Thread.run(Thread.java:662)
  </code></pre>
  
  <p>any ideas why ?</p>