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.
I have tried to just include the key pieces of each of these files, if there is additional configuration information needed, please comment.
applicationContext.xml
<context:component-scan base-package="com.project.core"/>
<context:spring-configured/>
<context:load-time-weaver weaver-class="org.springframework.instrument.classloading.SimpleLoadTimeWeaver" />
web.xml
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<!-- read the XmlWebApplicationContext for spring -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>OData</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.resourceConfigClass</param-name>
<param-value>org.odata4j.producer.resources.ODataResourceConfig</param-value>
</init-param>
<init-param>
<param-name>odata4j.producerfactory</param-name>
<param-value>com.wildgigs.core.odata.ExampleProducerFactory</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>OData</servlet-name>
<url-pattern>/example.svc/*</url-pattern>
</servlet-mapping>
ExampleProducerFactory.java
@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<User> 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<Iterable<User>>() {
public Iterable<User> apply() {
ThreadGroup tg = Thread.currentThread().getThreadGroup();
while (tg.getParent() != null)
tg = tg.getParent();
return Enumerable.create(usersArrayFinal).take(usersArrayFinal.length);
}
}, "Id");
return producer;
}
}
UserDaoImpl.java
@Repository
public class UserDaoImpl extends GenericDaoImpl<User, Long> 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();
}
}
You should use the jersey SpringServlet instead of the ServletContrainer. With that instead of specifying resourceConfig in the init param you can define it as a spring bean.