Eclipselink Cache Coordination with JBoss and JMS

Agenda:
  1. Creating JPA project and generating entities.
  2. Configuring persistence properties and JPA project
  3. Testing the JPA project
  4. Update database when entity changed.
  5. Setting up load balance database connection.
  6. Setting Cache Coordination in Eclipselink

Cache Coordination enables EclipseLink to synchronize data changes in a distributed environment. for more information about cache coordination in EclipseLink, click here.

Following are the steps to enable Cache Coordination in JBoss AS7 / JBoss EAP6.
1. create JMS topic

2. creaet JMS connection factory

3. add the cache coordination properties into persistence.xml

<property name="eclipselink.cache.coordination.protocol" value="jms" />

<property name="eclipselink.cache.coordination.jms.topic" value="jms/EclipseLinkTopic" />

<property name="eclipselink.cache.coordination.jms.factory" value="jms/EclipseLinkTopicConnectionFactory" />

<property name="eclipselink.cache.coordination.jms.reuse-topic-publisher" value="true" />

<property name="eclipselink.cache.coordination.jms.host" value="remote://HOST:PORT" />

4. in eclipseLink module.xml, add the following into <dependencies />

<module name="javax.jms.api"/>

5. in hornetq module.xml, add the following into <dependencies />
<module name="org.eclipse.persistence"/>


Done!!

Putting and getting data to/from infinispan

Example shown below is applicable and tested working in JBoss EAP 6.x and JBoss AS 7.x

1. Inject the cache container with @resouce annotation.

    a) name, inject with the container name

    b) lookup, inject with the jndi name configured in the cache container.

code below is presented with method (a)

@Resource(name = "java:jboss/infinispan/container/CACHE-CONTAINER-NAME-IN-STANDALONE.XML")
private CacheContainer container;

make sure the cache container name exist in standalone.xml 
else there will be NullPointerException when getting the cache from the cache container.

Add and remove JMS queue in JBoss admin console

1. navigate to JBoss Console login page and login as admin

2. navigate JMS Messaging Provider
    Profile > Messaging > Messaging Provider, click View

3. Click JMS Destination

4. under Queues tab, click add

5. fill in the form, click Save

6. Review the Queue summary

Done!!

How to activate / inactivate Portlet in LIferay

1. Login as Liferay Administrator

2. Navigate to Plugins Configuration
    Control Panel > Apps > Plugins Configuration

3. Click on 1 of the plugin from the list, eg. Documents and Media

4. untick the "Active" checkbox.

5. Save.

With these steps, the Documents and Media portlet/plugin has been deactivated.

Done!!

How to get size of a java collection in xhtml

Basically there are 2 ways to get the size of a collection / list in xhtml.
1. jstl function

#{ fn:length(myList) }

2. call the size() function directly

#{ myList.size() }

Done!!