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POInjecting generic Beans with CDI/Weld
 

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    <p>I just come from my tiny nice JavaSE/Guice world and am currently discovering the path of "carried by the container"-EE6. After having some trouble with Glassfish3.1, I just switched to JBoss and am now facing a problem that shouldnt be one.</p> <p>As infrastructural assisting class, im trying to create a generic repository/DAO for any kind of entity. In a very simple manner, this might look like this one.</p> <pre><code>public class Repository&lt;E, K extends Serializable &amp; Comparable&lt;K&gt;&gt; { private final Instance&lt;EntityManager&gt; entityManagerInstance; protected final Class&lt;E&gt; getDomainObjectClass() { return domainObjectClass; } private final Class&lt;E&gt; domainObjectClass; protected final EntityManager getEntityManager() { return entityManagerInstance.get(); } @Inject public Repository(Instance&lt;EntityManager&gt; entityManageryProvider, Provider&lt;E&gt; domainObjectProvider) { //This is a dirty hack, sadly :( domainObjectClass = (Class&lt;E&gt;)domainObjectProvider.get().getClass(); this.entityManagerInstance = entityManageryProvider; } public final void persist(E domainObject) { final EntityManager em = getEntityManager(); em.persist(domainObject); } public final Collection&lt;E&gt; getAllEntities() { final EntityManager em = getEntityManager(); final CriteriaBuilder cb = em.getCriteriaBuilder(); final CriteriaQuery&lt;E&gt; query = cb.createQuery(getDomainObjectClass()); final List&lt;E&gt; result = em.createQuery(query).getResultList(); return Collections.unmodifiableList(result); } public final E find(K id) { Preconditions.checkNotNull(id); final EntityManager em = getEntityManager(); return em.find(getDomainObjectClass(), id); } // [...] } </code></pre> <p>Now there may be a bean that does not require entity-dependent query capabilities but just a repository of a certain entity type, like (might be a test case):</p> <pre><code>public class DomainObjectARepositoryTest{ @Inject Repository&lt;DomainObjectA, PersistableUUID&gt; domainObjectARepository; @Test public void testMitarbeitererstellung() { for (DomainObjectA a : domainObjectARepository.getAllEntities()) { // do cool stuff } } } </code></pre> <p>Unfortunatly Weld does not seem to like this kind of generic injection. At deployment time, I get the following error:</p> <pre><code>state=Create: org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [Repository&lt;DomainObjectA , PersistableUUID&gt;] with qualifiers [@Default] at injection point [[field] @Inject sompackage.DomainObjectARepositoryTest.domainObjectARepository] </code></pre> <p>Am I missing something or did they just forgot to implement generic injects? As far as I understand the generic stuff, it is erasured after compiletime anyway - even this worked so fine in guice3 so far.</p> <p>Kind regards,</p> <p>avi</p> <p>edit: found a <a href="http://seamframework.org/Community/GenericDAO#comment79770">comment</a> by garvin king that this behavior is in the spec, but not implemented in weld, (staement was in june 2009)</p>
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    1. COGood find, regarding the comment :-)
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    2. COty @jan. Well, since this comment is not about two years old, I'd hope weld could have implemented it until now
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    3. COhi @avithan, how did you do this in Guice? Especially the `Provider<E> domainObjectProvider` part. Do you manually bind `Provider<X>` for every `X`?
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