I get this exception when I call http://localhost:8080/rf/home.seam SEVERE: Error Rendering View[/home.xhtml] | java.lang.IllegalArgumentException: Component j_id11:amm not instance of org.richfaces.component.UIDataTable | at org.ajax4jsf.framework.renderer.RendererBase.encodeBegin(RendererBase.java:94) | at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:788) | at javax.faces.component.UIData.encodeBegin(UIData.java:879) | at org.ajax4jsf.ajax.repeat.UIDataAdaptor.encodeBegin(UIDataAdaptor.java:989) | at org.ajax4jsf.framework.renderer.RendererBase.renderChild(RendererBase.java:280) | at org.ajax4jsf.framework.renderer.RendererBase.renderChildren(RendererBase.java:262) | at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:189) | at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:184) | at org.ajax4jsf.framework.renderer.RendererBase.encodeChildren(RendererBase.java:121) | at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812) | at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886) | at javax.faces.render.Renderer.encodeChildren(Renderer.java:137) | at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812) | at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886) | at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892) | at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:577) | at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108) | at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:233) | at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) | at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) | 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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) | 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(Unknown Source) home.xhtml: | (...) | <rich:dataTable id="amm" value="#{stringi}" var="s"> | <rich:column> | <f:facet name="header"> | <h:outputText id="ot2" value="Header"/> | </f:facet> | <h:outputText id="ot1" value="#{s}"> | | </h:outputText> | | </rich:column> | <a4j:support event="onclick" reRender="panel" oncomplete="javascript:Richfaces.showModalPanel('panel');"></a4j:support> | </rich:dataTable> | I know that it is problem with class loaders, but I can't resolve that issue. 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