CODEWITHSUNDEEP
javajakarta-eeinheritancecdiweld
wgualla
wgualla

Reputation: 61

why I can't inject child bean class of not bean abstract parent class

I have a parametrized abstract class with one parametrized constructor:

public abstract class BasicEntidadController<T extends Entidad> implements Serializable {

     public BasicEntidadController(EntidadBean<T> entidadSessionBean) {....}
     // other methods
}

and a child class extending it:

@SessionScoped
@Named
public class TiendaController extends BasicEntidadController<Tienda> implements Serializable {...}

and WELD reports an error telling me that "BasicEntidadController" is not proxyable....

org.jboss.weld.exceptions.UnproxyableResolutionException: WELD-001435 Normal scoped bean class org.wgualla.sandbox.entity.BasicEntidadController is not proxyable because it has no no-args constructor - Managed Bean [class org.wgualla.sandbox.tienda.TiendaController] with qualifiers [@Any @Default @Named].

Why WELD is trying to create a proxy of this abstract/no-bean class???

Must I do all classes, in inheritance tree, proxyables if I want to inject/use in EL expresion just the last child in the tree?

Thanks in advance.

Upvotes: 4

Views: 1920

Answers (1)

sashok_bg
sashok_bg

Reputation: 2989

By definition a java bean has "The class must have a public default constructor (with no arguments)."

See http://en.wikipedia.org/wiki/JavaBeans#JavaBeans_API

I would suggest that you change your constructor to

public BasicEntidadController() {....}
     // other methods

and then add a setter method

setEntidadSessionBean(EntidadBean<T> entidadSessionBean)

Or even better - read about dependancy injection. You can then use something like

@Autowired
EntidadBean<T> entidadSessionBean;

See http://www.vogella.com/articles/SpringDependencyInjection/

Hope this helps

Upvotes: 2

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