How to inject service to hibernate.ejb.interceptor with google guice? - jpa

Question

I have an issue with injecting a service to predefined interceptor using google guice.
What i'm trying to do is to use emptyinterceptor to intercept changes with entities. Interceptor itself works fine, the problem is that I can't figure out how to inject a service to it. Injections themselves work fine throughout the whole application.
persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="db-manager">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>test.Address</class>
<properties>
<property name="hibernate.ejb.interceptor" value="customInterceptor"/>
</properties>
</persistence-unit>
how im trying to inject
public class CustomInterceptor extends EmptyInterceptor {
private static final Logger LOG = Logger.getLogger(CustomInterceptor.class);
#Inject
private Provider<UploadedFileService> uploadedFileService;
...
}
how JpaPersistModule is initiated
public class GuiceListener extends GuiceServletContextListener {
private static final Logger LOG = Logger.getLogger(GuiceListener.class);
#Override
protected Injector getInjector() {
final ServicesModule servicesModule = new ServicesModule();
return Guice.createInjector(new JerseyServletModule() {
protected void configureServlets() {
// db-manager is the persistence-unit name in persistence.xml
JpaPersistModule jpa = new JpaPersistModule("db-manager");
...
}
}, new ServicesModule());
}
}
how services are initiated
public class ServicesModule extends AbstractModule {
#Override
protected void configure() {
bind(GenericService.class).to(GenericServiceImpl.class);
bind(AddressService.class).to(AddressServiceImpl.class);
}
}

Answer 1

I searched for hours and have find no real solution, so the ugly workaround I am using is to create 2 interceptors.
The first one is bound correctly by hibernate but does not have anything injected. It calls the second interceptor via some other mechanism - in the example below via a static reference to the InjectorFactory. The second interceptor is not bound to Hibernate, but like any other class, it can happily have stuff injected into it.
//The first ineterceptor has methods like this...
#Override
public synchronized void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
InjectorFactory.getInjector().getInstance(MyOtherInterceptor.class).onDelete(entity, id, state, propertyNames, types);
}
d
//The second one has the real implementation
#Inject
public MyOtherInterceptor() {
}
#Override
public synchronized void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
//Full implementation
}
//etc