Look up Method Injection in Spring

[Joe San]

Guys,

I'm trying something in the lines of having a Factory class return a Prototype of multiple types.

I have a Factory class as follows:

public final class PersistenceFactory {

    public static IUserPersistence getUserPersistence() {
        return new UserPersistence();
    }

    public static IContentPersistence getContentPersistence() {
        return new ContentPersistence();
    }
}

In the above getXXXPersistence() methods, I would like to have Spring give my objects as I have some injections happening in those implementations. For the very same purpose, I have looked up the Spring docs and came across the look up method injection. But the problem here is that to use the method injection (without having any dependencies on Spring, using the CGLIB proxy), I must declare the above Factory class as abstract as required by the CGLIB proxy. If that be the case, then it violates one principle that I want to maintain which is that the Factory class above will not retain its static methods and the class will not be final. Is there a way to overcome this?

In essence I want Spring to inject a Prototype bean (XXXPersistence) into the Singleton bean (MyXXXFactory). Any suggestions?

[Joe San]

But anyways, I wanted to give it a try. Here is how my first attempt looks like:

My PersistenceFactory:

public abstract class PersistenceFactory {

    /**
     * Dynamically create a new ContentDAOImpl
     * @param obj
     * @return
     */
	public abstract IContentDAO getContentDAO();
}

In my Service layer I let Spring inject my PersistenceFactory as follows:

	@Resource(name="persistenceFactory")
	private PersistenceFactory persistenceFactory;

        public void callcontentDAOSave() {

             .....
             .....
             .....
             persistenceFactory.getContentDAO().save();
        }

The error that I face:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 
'contentFacade' defined in class path resource [config/core/applicationContext-core.xml]: Cannot create inner bean 
'contentFacadeImpl' of type [com.quintilis31.home.core.content.facade.impl.ContentFacadeImpl] while setting bean property 
'target'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 
'contentFacadeImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'contentService': Injection of resource dependencies failed; nested exception is
 org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'persistenceFactory' must
be of type [com.quintilis31.home.persistence.type.impl.sql.jpa.jpaimpl.PersistenceFactory], but was actually of type [$Proxy40]