WildFly ee Subsystem Configuration

Internal

• WildFly ee Subsystem

Relevance

• EAP 6.4

Overview

<subsystem xmlns="urn:jboss:domain:ee:1.2">
  <spec-descriptor-property-replacement>false</spec-descriptor-property-replacement>
  <jboss-descriptor-property-replacement>true</jboss-descriptor-property-replacement>
  <annotation-property-replacement>false</annotation-property-replacement>
</subsystem>

Configuration

ear-subdeployments-isolated

As described in the WildFly Module - EAR Deployments section, the default behavior of the application server is to isolate EAR sub-deployments, so classes from a sub-deployment do not have by default access to classes from other sub-deployment. This behavior can be configured via ear-subdeployments-isolated setting of the ee subsystem. By default, in EAP 6 the value is implicitly true: the JEE modules are isolated, they do not have visibility into each other. In EAP 7, the default is false: the JEE modules can see each other's types.

This behavior can be changed as follows:

<subsystem xmlns="urn:jboss:domain:ee:1.0" >            
  <ear-subdeployments-isolated>false</ear-subdeployments-isolated>
</subsystem>

The ear-subdeployments-isolated element value has no effect on the isolated classloader of the WAR file(s). i.e. irrespective of whether this flag is set to true or false, the WAR within a EAR will have an isolated classloader and other sub-deployments within that EAR will not be able to access classes from that WAR. JEE specifications mandate this behavior.

If the ear-subdeployments-isolated is set to true then no automatic module dependencies between the sub-deployments are set up. User must manually setup the dependency with Class-Path: entries, or by setting up explicit module dependencies. The Java EE specification says that portable applications should not rely on sub deployments having access to other sub deployments unless an explicit Class-Path: entry is set in the MANIFEST.MF. So portable applications should always use Class-Path: entry to explicitly state their dependencies.

The global ear-subdeployments-isolated setting can overridden in the jboss-deployment-structure.xml deployment descriptor.

Global Module

It is possible to set up global modules that are accessible to all JEE deployments:

<subsystem xmlns="urn:jboss:domain:ee:1.2">           
  <global-modules>
    <module name="io.novaordis.playground.wildfly.custommodule" slot="1.0" />            
  </global-modules> 
</subsystem>