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{:title "EAP 6.4.x" :sequence 5.5 :description "Deploying your app to Red Hat JBoss Enterprise Application Platform 6.4.x"}

Red Hat JBoss Enterprise Application Platform (EAP for short) is the commercial product built on the open source JBoss application server. The current version (6.4.x) is based on a JBoss AS version that predates WildFly, so has some component differences with WildFly and Immutant itself. However, starting with Immutant 2.1.0, you can now deploy Immutant applications to EAP the same way you can to WildFly, with some caveats.

Messaging

EAP 6.4.x uses an older version of HornetQ (2.3.25 vs. 2.4.5 brought in by Immutant). If you are using org.immutant/messaging, you'll need to exclude its version of HornetQ and bring in the version being used in EAP:

:exclusions [org.hornetq/hornetq-jms-server org.hornetq/hornetq-server]
:dependencies [[org.hornetq/hornetq-jms-server "2.3.25.Final"]
               [org.hornetq/hornetq-server "2.3.25.Final"]]

Transactions

EAP 6.4.x uses a version of Narayana (4.17.29 vs. 5.0.3 brought in by Immutant). If you are using org.immutant/transactions, you'll need to exclude its version of Narayana and bring in the version being used in EAP (note the different groupId):

:exclusions [org.jboss.narayana.jta/narayana-jta]
:dependencies [[org.jboss.jbossts.jta/narayana-jta "4.17.29.Final"]]

If you are connecting external clients to the HornetQ inside EAP, you must not set the :remote-type option to :hornetq-wildfly in the options passed to [[immutant.messaging/context]] and will need to set the :port option to 5445 as EAP doesn't support WildFly's protocol multiplexing over HTTP.

Web

EAP 6.4.x uses jbossweb as its web/servlet server instead of Undertow (which Immutant uses standalone, and is the web/servlet server inside WildFly). The behavior of web requests in EAP should be the same as WildFly, but you'll need to do a couple of extra configuration steps if you intend to use Websockets.

First, you need to change the configuration of EAP itself (in standalone/configuration/standalone*.xml) to use a different protocol in the web subsystem. To do so, change:

<connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/>

to

<connector name="http" protocol="org.apache.coyote.http11.Http11NioProtocol" scheme="http" socket-binding="http"/>

Second, you'll need to include a custom jboss-web.xml file in the generated WAR file that enables Websockets for the deployment. The file needs to be under WEB-INF/jboss-web.xml, and contain:

<jboss-web>
  <enable-websockets>true</enable-websockets>
</jboss-web>

The easiest way to do this is to use the :war-resources option of the lein-immutant plugin. Note that a WAR with the above contents can't be deployed to a WildFly server, as enable-websockets isn't a valid option there, unfortunately.

Caching

Immutant's caching library is designed to work with different major versions of Infinispan, including 5, 6, 7 and 8. EAP 6.4 includes Infinispan 5, which is relatively old with some known issues. Three things, in particular:

• IMMUTANT-454 is not fixed in EAP 6.4
• Because it lacks support for Equivalence functions, binary keys are stored in wrappers, a common Infinispan technique prior to version 6. This limits your ability to read/write values in a cache with different encodings, which is something nobody should ever do anyway.
• Events are a little broken in Infinispan 5. Specifically, neither the :pre? nor :value attributes will change in the before and after events.

Detecting EAP at runtime

If you need to detect if you are running inside EAP or not, in addition to the [[immutant.util/in-container?]] function to let you know if you are in any container (WildFly or EAP), there is [[immutant.util/in-eap?]], which will only return true if you are running inside EAP.

Doing it all from a profile

If you want to only have these changes take effect when deploying to EAP, you can put them all in a lein profile:

:profiles {:eap
           {:exclusions [org.hornetq/hornetq-jms-server org.hornetq/hornetq-server
                         org.jboss.narayana.jta/narayana-jta]
            :dependencies [[org.hornetq/hornetq-jms-server "2.3.25.Final"]
                           [org.hornetq/hornetq-server "2.3.25.Final"]
                           [org.jboss.jbossts.jta/narayana-jta "4.17.29.Final"]]
            :immutant {:war {:resource-paths ["eap-resources"]}}}}

where eap-resources/ contains WEB-INF/jboss-web.xml. You would then apply this profile only when building a WAR file for EAP:

lein with-profile +eap immutant war

For an example of an application that does this, see our feature demo.