Seam Asynchronous Email

From Foochal

Contents 1 Write an async mailer class 2 Call the mailer class 3 Common errors 3.1 could not create Component org.jboss.seam.async.dispatcher 3.1.1 Cause 3.1.2 Solution 3.2 name not bound

Write an async mailer class

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.seam.annotations.AutoCreate;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.async.Asynchronous;
import org.jboss.seam.annotations.async.Duration;
import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.faces.Renderer;

@Name("emailService")
@AutoCreate
public class EmailService {
    private static final Log logger = LogFactory.getLog(EmailService.class);

    @In(create = true)
    private Renderer renderer;

    @Asynchronous
    public void sendMessage(@Duration
    long delay, String template, Object infoNeededForTemplate) {
        try {
            Contexts.getEventContext().set("info", infoNeededForTemplate);
            renderer.render(template);
        } catch (Exception e) {
            // suppress information.
            logger.error(e.getMessage());
        }
    }
}

Call the mailer class

    @In
    private EmailService emailService;

    public void takeAction() {
       // do something
       // ...

       // send email asynchrously
       emailService.sendMessage(500, "location-of-template.xhtml");
    }

Common errors

could not create Component org.jboss.seam.async.dispatcher

Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
java.lang.RuntimeException: Could not create Component: org.jboss.seam.async.dispatcher
	at org.jboss.seam.init.Initialization.addComponent(Initialization.java:989)
	at org.jboss.seam.init.Initialization.installComponents(Initialization.java:911)
	at org.jboss.seam.init.Initialization.init(Initialization.java:589)
	at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:34)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3856)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4361)
...
Caused by: java.lang.IllegalArgumentException: You must specify org.jboss.seam.core.init.jndiPattern or use @JndiName: org.jboss.seam.async.dispatcher
	at org.jboss.seam.Component.getJndiName(Component.java:438)
	at org.jboss.seam.Component.<init>(Component.java:243)
	at org.jboss.seam.Component.<init>(Component.java:217)
	at org.jboss.seam.init.Initialization.addComponent(Initialization.java:974)

Cause

This error occurs if you specify the following in components.xml

 <async:timer-service-dispatcher/>

Solution

Remove the above line from components.xml

name not bound

Caused by: javax.faces.el.EvaluationException: org.jboss.seam.InstantiationException: Could not instantiate Seam component: org.jboss.seam.async.dispatcher
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:91)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91)
	... 42 more
Caused by: org.jboss.seam.InstantiationException: Could not instantiate Seam component: org.jboss.seam.async.dispatcher
	at org.jboss.seam.Component.newInstance(Component.java:1986)
	at org.jboss.seam.Component.getInstance(Component.java:1876)
	... 43 more
Caused by: javax.naming.NameNotFoundException: foochal not bound
	at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
	at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
	at org.jnp.server.NamingServer.getObject(NamingServer.java:543)