Can I have Spring's @Component on enum?

Question

I\'m using Spring 3.0.x and following the enum singleton pattern for one of my implementatons.

public enum Person implements Nameable {
    INSTANCE;

    pu         


        

Answer 1

If you really need to use enum-based singleton (despite the fact that Spring beans are singletons by default), you need to use some other way to register that bean in the Spring context. For example, you can use XML configuration:

or implement a FactoryBean:

@Component
public class PersonFactory implements FactoryBean {
    public Person getObject() throws Exception {
        return Person.INSTANCE;
    }

    public Class getObjectType() {
        return Person.class;
    }

    public boolean isSingleton() {
        return true;
    }
}