EL enhancements inside Facelet templates - got an exception
What I was trying to achieve was a generic sortable header for dataTable. Here's the template:
header.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:column>
<f:facet name="header">
<h:commandLink action="#{bean.sort(columnName)}">
<h:outputText value="#{columnLabel}" />
<h:outputText value="#{sortAscending ? ' ASC' : ' DESC'}"
rendered="#{sortColumn == columnName}" />
</h:commandLink>
</f:facet>
<ui:insert />
</h:column>
</ui:composition>
This template is declared in Facelet taglib as:
<?xml version="1.0"?> <!DOCTYPE facelet-taglib PUBLIC "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN" "https://facelets.dev.java.net/source/browse/*checkout*/facelets/src/etc/facelet-taglib_1_0.dtd"> <facelet-taglib> <namespace>http://www.tdsecurities.com/jsf</namespace> <tag> <tag-name>header</tag-name> <source>tags/header.xhtml</source> </tag> </facelet-taglib>
and is used as follows:
<h:dataTable id="table" var="auditRecord" value="#{auditRecords}" rows="10">
<c:header bean="#{auditLog}" columnName="id" columnLabel="ID">
<h:commandLink value="#{auditRecord.id}" action="#{auditLog.select}" />
</c:header>
</h:dataTable>
The link renders, but clicking on it yields:
ERROR [org.jboss.seam.web.ExceptionFilter] - uncaught exception javax.servlet.ServletException: Error calling action method of component with id _id4:table:_id19 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:154) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) ERROR [org.jboss.seam.web.ExceptionFilter] - exception root cause javax.faces.FacesException: Error calling action method of component with id _id4:table:_id19 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:77) at javax.faces.component.UICommand.broadcast(UICommand.java:109) at javax.faces.component.UIData.broadcast(UIData.java:517) at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:97) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:171) at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32) at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:139) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63) at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79) at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.NullPointerException at org.jboss.seam.ui.facelet.MethodExpressionHelper.findParamTypes(MethodExpressionHelper.java:146) at org.jboss.seam.ui.facelet.MethodExpressionHelper.invokeTheExpression(MethodExpressionHelper.java:98) at org.jboss.seam.ui.facelet.ParamMethodExpression.invoke(ParamMethodExpression.java:62) at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68) at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69) at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61) ... 34 more
- it was supposed to execute auditLog.sort('id'), but apparently failed to evaluate the #{bean} expression, even though it was passed to the template via bean="#{auditLog}"
Am I misunderstanding the limits for EL enhancements, maybe? Is it usable in this context at all?
Thanks,
Alex