Hi,

We have seam application working perfectly fine... I need help is displaying any error message from external jar. After transaction success event in Seam (i.e. save/ update), we are using @Observer to call external jar

Env : jboss-4.2.3, jboss-seam-2.0.2.SP1

Situation :
Using @Observer, I am calling a function in External jar (non-seam) which returns some message. On the basis of the message returned from external jar I need to re-render the page if there is any error message (assuming message string will contain "Error" if there is any error).
I tried the below code and navigation rule (which I am sure is wrong) but not sure how and where to define the navigation rule after afterTransactionSuccess

Please suggest what will be the best approach.

@Name("testHome")
public class TestHome extends EntityHome<Test> {
     public String persist(){
          String persistResult = null;
          persistResult=super.persist();               

          return persistResult;
     }
}

@Name("externalApplicationInvoker")
@Scope(ScopeType.STATELESS)
public class ExternalApplicationInvoker
{
     @Observer("org.jboss.seam.afterTransactionSuccess.TestExperiment")
     public String testSavedOrUpdated() {
           returnMessage = executeExternalJar(arg1, arg2);          
           if(returnMessage.contains("Error")){
                log.info("ExternalApplicationInvoker.testSavedOrUpdated(), returnMessage contains ERROR");
                return "returnMessageError";
           }else{
                return returnMessage;
           }          
     }

     public String executeExternalJar(String arg1, String arg2) {
          String datasetGeneratedMessage = null;
          ExternalJar externalJar=new ExternalJar();
          datasetGeneratedMessage = externalJar.runProcess(args...);
          return datasetGeneratedMessage;
     }
}


<navigation from-action="#{testHome.persist}"> also tried <navigation from-action="#{externalApplicationInvoker.testSavedOrUpdated}">  
     <rule if-outcome="returnMessageError">
          <render view-id="/TestEdit.xhtml">
               <message severity="error">                       
                    Error processing external jar.... etc
               </message>
          </render>             
     </rule> 
</navigation>


Regards