On 26-05-2010 at 03:16, Nikolaos Giannopoulos wrote:
> So we have the following code excerpt:
>
> @Service
> public class ModalityServiceImpl implements ModalityService {
>
> @Autowired
> private ModalityDao modalityDaoImpl;
>
> public ModalityServiceImpl() {
> this.initService();
> }
>
> private void initAfter() {
> List<Modality> modalityList = this.modalityDaoImpl.findAll();
> // ** NPE ** - this.modalityDaoImpl ** IS NULL **
> this.modalityCache = new ModalityCache();
> this.modalityCache.init(modalityList);
> }
>
> However, the above results in a NullPointerException at the line marked
> with ** NPE ** because this.modalityDaoImpl is NULL which clearly
> indicates that Spring has not completed the Autowiring and we are trying
> to invoke a method on.I may be going against dogma here, but I prefer all classes to be in a valid state all the time. So no Spring injection into fields: after construction the object is in an invalid state until Spring completes the injection. Instead, I let Spring do Constructor injection. CON: I need to set the field myself (but I can make it final) PRO: The constructor can do the initialization Oscar -- ,-_ /() ) Oscar Westra van Holthe - Kind http://www.xs4all.nl/~kindop/ (__ ( =/ () QED - Quite Easily Done
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