Target Unreachable, identifier 'user' resolved to null
I am learning richfaces, and have run into a problem early on that I cannot resolve.
I have am simply trying to fire a method in my managed bean from an a4j command button. However, I continually get the exception below.
"Target Unreachable, identifier 'user' resolved to null"
JSP file snippet:
<body>
<a4j:form>
<rich:panel>
<f:facet name="header">
JBoss RichFaces
</f:facet>
An example data table displaying member names
<rich:dataTable value="#{testBean.members}" var="user" id="memberdata">
<h:column>
<h:outputText id="name" value="#{user.name}"/>
</h:column>
</rich:dataTable>
<a4j:commandButton reRender="memberdata" action="#{user.doSomething}" value="Update"/>
</rich:panel>
</a4j:form>
</body>Managed Bean (request scope)
public class TestBean {
private List<Members> members;
public TestBean() {
this.members = new ArrayList<Members>();
this.members.add(new Member("Ted");
}
public void doSomething() {
System.out.println("Doing Something!");
}
public List<Members> getMembers() {
return members;
}
public void setMembers(List< Members > members) {
this.members = members;
}
}
Faces-Config:
<?xml version="1.0" encoding="UTF-8"?> <faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"> <managed-bean> <managed-bean-name>testBean</managed-bean-name> <managed-bean-class>com.test.TestBean</managed-bean-class> <managed-bean-scope>request</managed-bean-scope> </managed-bean> <application> <view-handler>com.sun.facelets.FaceletViewHandler</view-handler> </application> </faces-config>
The exception I get:
SEVERE: /index.xhtml @25,91 action="#{user.doSomething}": Target Unreachable, identifier 'user' resolved to null
javax.faces.el.EvaluationException: /index.xhtml @25,91 action="#{user.doSomething}": Target Unreachable, identifier 'user' resolved to null
at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at org.ajax4jsf.component.AjaxActionComponent.broadcast(AjaxActionComponent.java:55)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:316)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:291)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:248)
at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:461)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
at org.ajax4jsf.Filter.doFilter(Filter.java:175)
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:128)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Apr 25, 2009 3:03:04 PM com.sun.faces.lifecycle.InvokeApplicationPhase execute
WARNING: #{user.doSomething}: /index.xhtml @25,91 action="#{user.doSomething}": Target Unreachable, identifier 'user' resolved to null
javax.faces.FacesException: #{user.doSomething}: /index.xhtml @25,91 action="#{user.doSomething}": Target Unreachable, identifier 'user' resolved to null
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
at javax.faces.component.UICommand.broadcast(UICommand.java:387)
at org.ajax4jsf.component.AjaxActionComponent.broadcast(AjaxActionComponent.java:55)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:316)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:291)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:248)
at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.java:461)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
at org.ajax4jsf.Filter.doFilter(Filter.java:175)
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:128)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: /index.xhtml @25,91 action="#{user.doSomething}": Target Unreachable, identifier 'user' resolved to null
at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
... 27 more
