FacesContext is null in web flow 2.0.5

[ashkan.am528]

hi
on rendering the page i fill the h:selectOneMenu if error occured i create a message with FacesContext.getCurrentInstanece()..........
but FacesContext.getCurrentInstanece() is null.

this is my code
search-flow.xml

	
<view-state id="list" view="../test/search.xhtml">

	<on-render>
		<evaluate expression="search.getAccounts()" result="flowScope.accounts"/>

	</on-render>
		<transition on="cancel" to="end" />
	</view-state>

	public List<SelectItem> getAccounts() {

    	try {
           
            ......
    	}
    	catch (Exception e) {
    		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "error", ""));
    	}

    }

web-mvc.xml

<bean class="org.springframework.webflow.mvc.servlet.FlowHandlerMapping">
		<property name="flowRegistry" ref="flowRegistry" />
		<property name="defaultHandler">
			<bean class="org.springframework.web.servlet.mvc.UrlFilenameViewController" />
		</property>
	</bean>

	<bean id="faceletsViewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
		<property name="viewClass" value="org.springframework.faces.mvc.JsfView"/>
		<property name="prefix" value="/test/" />
		<property name="suffix" value=".xhtml" />
	</bean>

	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />

	<bean class="org.springframework.webflow.mvc.servlet.FlowHandlerAdapter">
		<property name="flowExecutor" ref="flowExecutor" />
	</bean>

web-flow.xml

<webflow:flow-executor id="flowExecutor">
		<webflow:flow-execution-listeners>
			<webflow:listener ref="securityFlowExecutionListener" />
		</webflow:flow-execution-listeners>
		<webflow:flow-execution-attributes>
			<webflow:always-redirect-on-pause value="false"/>
		</webflow:flow-execution-attributes>
	</webflow:flow-executor>

	<webflow:flow-registry id="flowRegistry" flow-builder-services="facesFlowBuilderServices" base-path="/WEB-INF/f">
		<webflow:flow-location-pattern value="/**/*-flow.xml" />
	</webflow:flow-registry>

	<faces:flow-builder-services id="facesFlowBuilderServices" development="true" />

	<bean id="securityFlowExecutionListener" class="org.springframework.webflow.security.SecurityFlowExecutionListener" />

faces-config.xml

<managed-bean>
  <managed-bean-name>search</managed-bean-name>
  <managed-bean-class>com.test.Search</managed-bean-class>
  <managed-bean-scope>request</managed-bean-scope>
 </managed-bean>
 <application>
  <variable-resolver>org.springframework.web.jsf.SpringBeanVariableResolver</variable-resolver>
  <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
  <view-handler>com.sun.facelets.FaceletViewHandler</view-handler>
 </application>

if i define bean in application-context or add this part to application-context

<context:component-scan base-package="com.test" />

nothing change

[jeremyg484]

FacesContext has not been re-constructed yet at that point as on-render actually fires just before the rendering process. Easiest alternative is to pass the SWF MessageContext into your method and use that to add the message (with Spring Faces, any message added to the SWF MessageContext will be available as a FacesMessage).

So in your flow definition:

<on-render>
    <evaluate expression="search.getAccounts(messageContext)" result="flowScope.accounts"/>
</on-render>

and in your Java code:

public List<SelectItem> getAccounts(MessageContext messages) {

    try {
           
        ......
    }
    catch (Exception e) {
        messages.addMessage(new MessageBuilder().error().defaultText("error").build());
    }
}

[ashkan.am528]

thanks for your response.
can you tell me the harder way for this question.
because i use FacesContext for getting component , adding message, getting http request for many process, and so on.

[ashkan.am528]

no message displayed in style that you said.
i put externalContext as input parameter of getAccounts method, from request and response i create facesContext object, but message didn't displayed in page.
how can i pass facesContext as method parameter?

[kam11]

at that point as on-render actually fires just before the rendering process. Easiest alternative is to pass the SWF MessageContext into your method and use that to add the message (with Spring Faces, any message added to the SWF MessageContext

[ashkan.am528]

i send request to service layer of my application in on-renderer and based on result of service i load different ui for client. in this situation i need FacesContext.
i there another way for solving this problem with web flow and jsf?

[Hedin]

i send request to service layer of my application in on-renderer and based on result of service i load different ui for client. in this situation i need FacesContext.
i there another way for solving this problem with web flow and jsf?

You can use JSF capability (PhaseListener for instance) to execute code at the specified moment of the JSF lifecycle.

[ashkan.am528]

can you explain how to use phaselistener?
if you meen beforPhase and afterPhase ,it has a lot of problem.
you must change one class of facelet in 1.1.9.
i need something in web flow, or something like @postConstruct that i can inject spring service to it.

[Hedin]

can you explain how to use phaselistener?
if you meen beforPhase and afterPhase ,it has a lot of problem.
you must change one class of facelet in 1.1.9.
i need something in web flow, or something like @postConstruct that i can inject spring service to it.

We use facelets 1.1.14 and don't have any problem with PhaseListener's. All is needed - is just register them in faces-config.xml. If you need access to the flow context - invoke RequestContextHolder.getRequestContext().