<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<body link="#355491" alink="#4262a1" vlink="#355491" style="background: #e2e2e2; margin: 0; padding: 20px;">
<div>
<table cellpadding="0" bgcolor="#FFFFFF" border="0" cellspacing="0" style="border: 1px solid #dadada; margin-bottom: 30px; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td>
<table border="0" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" style="border: solid 2px #ccc; background: #dadada; width: 100%; -moz-border-radius: 6px; -webkit-border-radius: 6px;">
<tbody>
<tr>
<td bgcolor="#000000" valign="middle" height="58px" style="border-bottom: 1px solid #ccc; padding: 20px; -moz-border-radius-topleft: 3px; -moz-border-radius-topright: 3px; -webkit-border-top-right-radius: 5px; -webkit-border-top-left-radius: 5px;">
<h1 style="color: #333333; font: bold 22px Arial, Helvetica, sans-serif; margin: 0; display: block !important;">
<!-- To have a header image/logo replace the name below with your img tag -->
<!-- Email clients will render the images when the message is read so any image -->
<!-- must be made available on a public server, so that all recipients can load the image. -->
<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
</td>
</tr>
<tr>
<td bgcolor="#FFFFFF" style="font: normal 12px Arial, Helvetica, sans-serif; color:#333333; padding: 20px; -moz-border-radius-bottomleft: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 5px; -webkit-border-bottom-left-radius: 5px;"><h3 style="margin: 10px 0 5px; font-size: 17px; font-weight: normal;">
Suspend MDB message processing until @StartupBean has finished initialization
</h3>
<span style="margin-bottom: 10px;">
created by <a href="https://community.jboss.org/people/skowski">skowski</a> in <i>EJB3 Development</i> - <a href="https://community.jboss.org/message/772984#772984">View the full discussion</a>
</span>
<hr style="margin: 20px 0; border: none; background-color: #dadada; height: 1px;">
<div class="jive-rendered-content"><p>Hi :-)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>While migrating a JBoss 5 application to JBoss AS 7 (7.1.1.FINAL) I have a problem with a new JMS message driven EJB. Within message processing, some master data fields have to be checked. To enhance performance, this master data shall be preloaded into a cache structure using a @Singleton @Startup EJB, which needs about 30 seconds to load the data.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My problem is that the queue message processing starts even if the cache has not been fully initialized, causing message validation errors.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I tried to define a dependency between the MDB and the startup EJB, but as far as I understood the @DependsOn annotation works only with @Singleton EJBs. So it's clear that my solution does not work ;-)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Startup bean code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>{code}</p><p>@Singleton</p><p>@Startup</p><p>public class StartupBean {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @PostConstruct</p><p>    void atStartup() {</p><p>        // TODO load master data cache (takes about 30 seconds)</p><p>    }</p><p>    </p><p>    @PreDestroy()</p><p>    void atShutdown() {</p><p>        // TODO free master data cache</p><p>    }</p><p>}</p><p>{code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Note: I stripped the real code from the example to make it easier to read :-)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Message driven bean code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>{code}</p><p>@MessageDriven(name="SampleMessagingBean", activationConfig = {</p><p>        @ActivationConfigProperty(propertyName="destinationType", propertyValue="javax.jms.Queue"),</p><p>        @ActivationConfigProperty(propertyName="destination", propertyValue="jms/SampleQueue"),</p><p>        @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge")</p><p>    })</p><p>@DependsOn("StartupBean")</p><p>public class SampleMessagingBean implements MessageListener {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void onMessage(Message message) {</p><p>        // TODO validate message using master data cache</p><p>    }</p><p>}</p><p>{code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Question: How can I suspend message processing until the startup bean has finished loading the cache?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any suggestions greatly appreciated :-)!</p></div>
<div style="background-color: #f4f4f4; padding: 10px; margin-top: 20px;">
<p style="margin: 0;">Reply to this message by <a href="https://community.jboss.org/message/772984#772984">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in EJB3 Development at <a href="https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2030">Community</a></p>
</div></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>