将 Spring 依赖项注入 JPA EntityListener [英] Injecting a Spring dependency into a JPA EntityListener

问题描述

我正在尝试将 Spring 依赖项注入 JPA EntityListener.这是我的听众课程:

I am trying to inject a Spring dependency into an JPA EntityListener. Here is my listener class:

@Configurable(autowire = Autowire.BY_TYPE, dependencyCheck = true)
public class PliListener {

    @Autowired
    private EvenementPliRepository evenementPliRepository;

    @PostPersist
    void onPostPersist(Pli pli) {
        EvenementPli ev = new EvenementPli();
        ev.setPli(pli);
        ev.setDateCreation(new Date());
        ev.setType(TypeEvenement.creation);
        ev.setMessage("Création d'un pli");
        System.out.println("evenementPliRepository: " + evenementPliRepository);
        evenementPliRepository.save(ev);
    }


}

这是我的实体类:

@RooJavaBean
@RooToString
@RooJpaActiveRecord
@EntityListeners(PliListener.class)
public class Pli implements Serializable{
...

但是，我的依赖项(即evenementPliRepository)始终为空.

However, my dependency (i.e. evenementPliRepository) is always null.

有人可以帮忙吗?

推荐答案

在无状态 bean 上注入依赖项的一个 hack，是将依赖项定义为静态"，创建一个 setter 方法以便 Spring 可以注入依赖项(分配它到静态依赖).

A hack to inject dependencies on stateless beans, is to define the dependency as "static", create a setter method so that Spring can inject the dependency (assigning it to the static dependency).

将依赖声明为静态.

static private EvenementPliRepository evenementPliRepository;

创建一个方法，以便 Spring 可以注入它.

Create a method so that Spring can inject it.

@Autowired
public void init(EvenementPliRepository evenementPliRepository) 
{
    MyListenerClass.evenementPliRepository = evenementPliRepository;
    logger.info("Initializing with dependency ["+ evenementPliRepository +"]"); 
}

更多详细信息，请访问:http://blog-en.lineofsightnet.com/2012/08/dependency-injection-on-stateless-beans.html

More details at: http://blog-en.lineofsightnet.com/2012/08/dependency-injection-on-stateless-beans.html

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