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Re: JBoss Modules and a NICE Documentation
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created by <a href="http://community.jboss.org/people/jaikiran">jaikiran pai</a> in <i>JBoss AS 7 Development</i> - <a href="http://community.jboss.org/message/644348#644348">View the full discussion</a>
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<div class="jive-rendered-content"><blockquote class="jive-quote"><p>Nikos Ballas wrote:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Yes yes , i tried the deployments and deployment you suggest in the link ,but i challenge you to do the following:</p><p>1)Declare a jar where you will only have @Entity mappings with persistence.xml and orm.xml(not mandatory in JPA 2.0).Deploy that.</p><p>2)Declare a jar where you will have your EJB's 3 which will implement a service layer and you need to do the @PersistenceContext(unitName="mypu").</p><p>    Deploy that following the jboss-deployment-structure.xml.I think you will be disappointed.I have already discussions with Scott Marlow on it...there is also a JIRA issue created out of it and currently there is no way to inject in different deployments services from other deployed jars.</p></blockquote><p>So you have 2 independent deployments (one containing the persistence unit and the other using it) and you want to access the persistence unit in the second deployment? There's no <em>portable</em> way for it:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>JPA2 spec, section 8.2.2 Persistence Unit Scope</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>An EJB-JAR, WAR, application client jar, or EAR can define a persistence unit. When referencing a persistence unit using the unitName annotation element or persistence-</p><p>unit-name deployment descriptor element, the visibility scope of the persistence unit is determined by its point of definition:</p><p>- A persistence unit that is defined at the level of an EJB-JAR, WAR, or application client jar is scoped to that EJB-JAR, WAR, or application jar respectively and is visible to the components defined in that jar or war.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>- A persistence unit that is defined at the level of the EAR is generally visible to all components in the application. However, if a persistence unit of the same name is defined by an EJB-JAR, WAR, or application jar file within the EAR, the persistence unit of that name defined at EAR level will not be visible to the components defined by that EJB-JAR, WAR, or application jar file unless the persistence unit reference uses the persistence unit name # syntax to specify a path name to disambiguate the reference. When the # syntax is used, the path name is relative to the referencing application component jar file. For example, the syntax ../lib/persistenceUnitRoot. jar#myPersistenceUnit refers to a persistence unit whose name, as specified in the name element of the persistence.xml file, is myPersistenceUnit and for which the relative path name of the root of the persistence unit is ../lib/persistenceUnitRoot.jar. The # syntax may be used with both the unitName annotation element or persistence-unit-name deployment descriptor element to reference a persistence unit defined at EAR level.</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Previous versions of JBoss AS used to allow it but it was a JBoss specific extension. I'm not sure if other server support it. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>Nikos Ballas wrote:</p><p>@Stephen...for me it works to...but i don't want to use ears/wars only deployments</p></blockquote><p>Any reason why you want to avoid such packaging which allows you to achieve the usecase you are after?</p></div>
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