Correct way of making a singleton a Spring bean

Question

I am converting a singleton to a Spring bean, so that if the singleton fails to initialize, then entire web application\'s spring context doesn\'t load properly.

Th

Answer 1

To run code at startup (and fail on error) use one of the many ways to register startup events, e.g. see http://www.baeldung.com/running-setup-logic-on-startup-in-spring

Example:

@Component
public class InitializingBeanExampleBean implements InitializingBean {

    private static final Logger LOG = Logger.getLogger(InitializingBeanExampleBean.class);

    @Autowired
    private Environment environment;

    @Override
    public void afterPropertiesSet() throws Exception {
        LOG.info(Arrays.asList(environment.getDefaultProfiles()));
    }
}