Unable to render Error Message on JSF page

[bansi <ma...@yahoo.com>]

I have a textfield on jsf page , the onblur event of textfield calls a
backing bean method . This method in certain situation catches Exception and
calls FacesContext to render error message on jsf page. The problem is
message doesnt get render on to jsf page inspite of having h:message tag.

Here is the snippet

JSF page
<h:panelGrid columns="3" styleClass="detail" columnClasses="label" > 
	                <h:outputLabel><h:outputText  value="Property Tag" />
</h:outputLabel>					
		                <h:inputText  id="propertyTag"
value="#{deviceBean.tagNumber}" >
		            			<a4j:support  action="#{deviceBean.loadAssetDetails}"
event="onblur" reRender="mypanel"  />
		                </h:inputText>
		             <h:message id="propertyTagError" for="propertyTag" 
styleClass="errorMessage" />
					</h:panelGrid>

Backing Bean
public String loadAssetDetails() {
try{
	namsAsset = deviceManager.getAssetDetails(sourceSystem, tagNumber);	//calls
database
 }catch(RuntimeException re){
		 			
	if (re.getMessage().contains("No Asset found")){
					System.out.println("Inside Bean No Asset Exception");
		 				 			
FacesContext.getCurrentInstance().addMessage("deviceForm:propertyTag", new
FacesMessage(FacesMessage.SEVERITY_ERROR, re.getMessage(),
re.getMessage()));
		 						 				return null;
		 			}
}
The log file prints the messages inside the catch block. But it doesnt get
render on JSF page. Any pointers/suggestions will be highly appreciated
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