Java EntityManager没有被Guice注入

我更新了createInjector调用以包含我的JPAPersisteModule

Guice.createInjector新应用程序模块，新JpaPersistModulesimpleRestApplication

在我的服务中，我的DAO注入没有问题

@Path("/users")
public class UserService {

    @Inject
    private UserDAO dao;

    public UserService() {
        Application.getInjector().injectMembers(this);
    }


}

在我的UserDAOImpl上，提供者不会被注入

@Inject
private Provider<EntityManager> em;

基于此，我更改了ApplicationModule上的配置方法，以安装JpaPersistenceModule并启动PersistService

现在EntityManager被注入，没有任何错误

public class UserDAOImpl implements UserDAO {

    @Inject
    private EntityManager em;

}

@Singleton
private static class JPAInitializer {
    @Inject
    public JPAInitializer(final PersistService service) {
        service.start();
    }
}

@Override
protected void configure() {

    install(new JpaPersistModule("simpleRestApplication"));
    bind(JPAInitializer.class).asEagerSingleton();

    // another bindings...

}

public class UserDAOImpl implements UserDAO {

    @Inject
    private EntityManager em;

}