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POAuto-wiring with spring in an init-param class of a servlet
 

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    <p>I am having some difficulty auto-wiring beans into a class which is loaded as an init-param in a servlet for OData4j. I have tried many solutions including load-time-weaving but cannot seem to get it to work correctly because as I understand it, the class which is being passed as an init-param to the servlet is being loaded prior to Spring context being loaded at all. Below is the current state of my configuration, is there a way to have dependency injection in a class loaded in such a way? The end goal is to have the ExampleProducerFactory.java (which is an init-param of the OData servlet) having the UserDao bean autowired.</p> <p>I have tried to just include the key pieces of each of these files, if there is additional configuration information needed, please comment.</p> <p>applicationContext.xml</p> <pre><code> &lt;context:component-scan base-package="com.project.core"/&gt; &lt;context:spring-configured/&gt; &lt;context:load-time-weaver weaver-class="org.springframework.instrument.classloading.SimpleLoadTimeWeaver" /&gt; </code></pre> <p>web.xml</p> <pre><code> &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.request.RequestContextListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;!-- read the XmlWebApplicationContext for spring --&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;servlet&gt; &lt;servlet-name&gt;OData&lt;/servlet-name&gt; &lt;servlet-class&gt;com.sun.jersey.spi.container.servlet.ServletContainer&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.config.property.resourceConfigClass&lt;/param-name&gt; &lt;param-value&gt;org.odata4j.producer.resources.ODataResourceConfig&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;odata4j.producerfactory&lt;/param-name&gt; &lt;param-value&gt;com.wildgigs.core.odata.ExampleProducerFactory&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;OData&lt;/servlet-name&gt; &lt;url-pattern&gt;/example.svc/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>ExampleProducerFactory.java</p> <pre><code> @Configurable(autowire= Autowire.BY_NAME) public class ExampleProducerFactory implements ODataProducerFactory { @Autowired private UserDao userDao; @Override public ODataProducer create(Properties arg0) { InMemoryProducer producer = new InMemoryProducer("example"); List&lt;User&gt; users = userDao.findAll(); User[] usersArray = new User[users.size()]; users.toArray(usersArray); final User[] usersArrayFinal = usersArray; producer.register(User.class, Long.class, "Users", new Func&lt;Iterable&lt;User&gt;&gt;() { public Iterable&lt;User&gt; apply() { ThreadGroup tg = Thread.currentThread().getThreadGroup(); while (tg.getParent() != null) tg = tg.getParent(); return Enumerable.create(usersArrayFinal).take(usersArrayFinal.length); } }, "Id"); return producer; } } </code></pre> <p>UserDaoImpl.java</p> <pre><code> @Repository public class UserDaoImpl extends GenericDaoImpl&lt;User, Long&gt; implements UserDao, Serializable { @Transactional(readOnly = true) public User getByUserName(String userName) { Query query = getSession().createQuery("FROM User where upper(userName) = :name"); query.setString("name", userName.toUpperCase()); return (User) query.uniqueResult(); } } </code></pre>
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