TransactionRequiredException：Jersey+Guice+JPA中没有事务在进行

Question

GuiceModule类：

public class GuiceModule extends ServletModule {

@Override
protected void configureServlets() {
  // start the service
  bind(JPAInitializer.class).asEagerSingleton();

  // PersistFilter
  filter("/*").through(PersistFilter.class);

  // jpa + guice
  install(new JpaPersistModule("drone-cloud"));

  // bindings
  bind(UserService.class).to(UserServiceImpl.class);
  bind(TwoFactorAuthenticator.class).to(GoogleAuthenticator.class);
  bind(ImageQueue.class).asEagerSingleton();
  bind(DroneCloudServerHandler.class).asEagerSingleton();
 }
}

import javax.inject.Inject;
import com.google.inject.persist.PersistService;

public class JPAInitializer {
   @Inject
   JPAInitializer(PersistService service) {
      service.start();
   }
}

控制器类：

@Consumes(MediaType.APPLICATION_JSON)
@Path("/mission")
public class MissionController {

   @Inject
   Provider<EntityManager> _em;

   @Path("/new")
   @POST
   @Transactional
   public String newMission(SimpleMission mission) {

      _em.get().persist(mission);
      _em.get().flush();
      _em.get().close();

      return "{ \"mission_id\": \"" + mission.getId() + "\" }";
   }
}

和StackTrace：

我做错了什么？

谢谢

Answer 1

问题在于MissionController类是由Jersey管理的，而不是由Guice管理的，因此JPalocaltXNInterceptor不会截获它

我通过将与DB相关的代码移到另一个类中来解决它，如下所示：

class MissionController {
    @Inject MissionDao dao;
    ....
}


public class MissionDao {
   @Inject Provider<EntityManager> em;

   @Transactional
   public void save(SimpleMission mission) {
      em.get().persist(mission);
   }
   ...
}