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javadependency-injectioncdi

java CDI injection how to annotate and modify third part class

I'm new to java CDI, I'm wondering how can I annotate a third party class when I inject it.

For example, I would like to inject jackson ObjectMapper into many of my services, and I would like to register some customized serializer, what I can do is write a method and mark as @PostConstruct but only when I can access its code. I think this scenario is quite common when injecting some third part class but would like to do some customization on them. What's a common practice in java CDI?

Solution

  • Write a producer.

    I use this often for creation of loggers like this:

    @ApplicationScoped
public class LoggerProducer {
   @Produces
   public Logger getLogger(InjectionPoint ip) {
      // only include the injection point if you need it
      return LoggerFactory.getLogger(ip.getBean().getBeanClass().getSimpleName());
   }
}

...

@Inject
private Logger logger;