Thanks again but I still have problems. Before getting this to work in a
servlet (GWT-P dispatch handler), I am trying to run it inside a simple
main(). I'm getting the following error when running the code below. It's
compaining when invoking the ApplicationInitializer.
Exception in thread "main" com.google.inject.ConfigurationException: Guice
configuration errors:
1) Unable to create binding for com.google.inject.persist.PersistService.
It was already configured on one or more child injectors or private modules
bound at
com.google.inject.persist.jpa.JpaPersistModule.configurePersistence(JpaPersistModule.java:69)
If it was in a PrivateModule, did you forget to expose the binding?
while locating com.google.inject.persist.PersistService
for parameter 0 at SomeService // this line: @Inject
ApplicationInitializer(PersistService service) {
while locating SomeService$ApplicationInitializer
1 error
at
com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1004)
at
com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:961)
at
com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013)
at SomeService // this line:
injector.getInstance(ApplicationInitializer.class);
...
public class SomeService {
@Inject @MyDataSourceOne EntityManager em;
// ...
public static void main(String[] args) {
Module one = new PrivateModule() {
protected void configure() {
final JpaPersistModule jpm = new
JpaPersistModule("pu-name");
jpm.properties(new Properties());
install(jpm);
final Provider<EntityManager> entityManagerProvider =
binder().getProvider(EntityManager.class);
bind(EntityManager.class).annotatedWith(MyDataSourceOne.class).toProvider(entityManagerProvider);
expose(EntityManager.class).annotatedWith(MyDataSourceOne.class);
}
};
// similar code for "two"
Injector injector = Guice.createInjector(one, two);
injector.getInstance(ApplicationInitializer.class);
SomeService service = injector.getInstance(SomeService.class);
// run one of this service's methods
}
static class ApplicationInitializer {
@Inject ApplicationInitializer(PersistService service) {
service.start();
}
}
}
If I do *not *use ApplicationInitilizer, I'm getting a NullPointerException:
Exception in thread "main" com.google.inject.ProvisionException: Guice
provision errors:
1) Error in custom provider, java.lang.NullPointerException
while locating com.google.inject.persist.jpa.JpaPersistService
while locating javax.persistence.EntityManager
at SomeService // this line:
bind(EntityManager.class).annotatedWith(MyDataSourceOne.class).toProvider(entityManagerProvider);
while locating javax.persistence.EntityManager annotated with
@....MyDataSourceOne()
for field at SomeService...
while locating SomeService
1 error
at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987)
at
com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013)
at SomeService // this line: SomeService service =
injector.getInstance(SomeService.class);
Caused by: java.lang.NullPointerException
at
com.google.inject.persist.jpa.JpaPersistService.begin(JpaPersistService.java:70)
On Monday, January 2, 2012 2:29:54 AM UTC+1, scl wrote:
>
> If you want to expose the EntityManager you can do this as follows:
>
> // in your private module:
> final Provider<EntityManager> entityManagerProvider =
> binder().getProvider(EntityManager.class);
> bind(EntityManager.class).annotatedWith(MyDataSourceOne.class).toProvider(entityManagerProvider);
>
>
> expose(EntityManager.class).annotatedWith(MyDataSourceOne.class);
>
> Now the EntityManager is available outsied the private module:
>
> @Inject @MyDataSourceOne
> EntityManager entityManager;
>
>
> And here is the code to the session provider you asked for:
>
> public class SessionProvider implements Provider<Session> {
> /** The entity manger to retrieve the session from. */
> @Inject
> private Provider<EntityManager> entityManagerProvider;
>
> /**
> * @return the Hibernate session, being the delegate of the entity
> manager provided by the injected entity manager provider.
> */
> @Override
> public Session get() {
> final Session session = (Session)
> entityManagerProvider.get().getDelegate();
> // configure session i.e. flush mode or filtering
> return session;
> }
>
>
On Monday, January 2, 2012 2:29:54 AM UTC+1, scl wrote:
>
> If you want to expose the EntityManager you can do this as follows:
>
> // in your private module:
> final Provider<EntityManager> entityManagerProvider =
> binder().getProvider(EntityManager.class);
> bind(EntityManager.class).annotatedWith(MyDataSourceOne.class).toProvider(entityManagerProvider);
>
>
> expose(EntityManager.class).annotatedWith(MyDataSourceOne.class);
>
> Now the EntityManager is available outsied the private module:
>
> @Inject @MyDataSourceOne
> EntityManager entityManager;
>
>
> And here is the code to the session provider you asked for:
>
> public class SessionProvider implements Provider<Session> {
> /** The entity manger to retrieve the session from. */
> @Inject
> private Provider<EntityManager> entityManagerProvider;
>
> /**
> * @return the Hibernate session, being the delegate of the entity
> manager provided by the injected entity manager provider.
> */
> @Override
> public Session get() {
> final Session session = (Session)
> entityManagerProvider.get().getDelegate();
> // configure session i.e. flush mode or filtering
> return session;
> }
>
>
On Monday, January 2, 2012 2:29:54 AM UTC+1, scl wrote:
>
> If you want to expose the EntityManager you can do this as follows:
>
> // in your private module:
> final Provider<EntityManager> entityManagerProvider =
> binder().getProvider(EntityManager.class);
> bind(EntityManager.class).annotatedWith(MyDataSourceOne.class).toProvider(entityManagerProvider);
>
>
> expose(EntityManager.class).annotatedWith(MyDataSourceOne.class);
>
> Now the EntityManager is available outsied the private module:
>
> @Inject @MyDataSourceOne
> EntityManager entityManager;
>
>
> And here is the code to the session provider you asked for:
>
> public class SessionProvider implements Provider<Session> {
> /** The entity manger to retrieve the session from. */
> @Inject
> private Provider<EntityManager> entityManagerProvider;
>
> /**
> * @return the Hibernate session, being the delegate of the entity
> manager provided by the injected entity manager provider.
> */
> @Override
> public Session get() {
> final Session session = (Session)
> entityManagerProvider.get().getDelegate();
> // configure session i.e. flush mode or filtering
> return session;
> }
>
>
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