Order of @PostConstruct and inheritance

Question

Let's suppose we have the following classes

public abstract class AbstractFoo {

    @PostConstruct
    private void doIt() {
       //
    }
}

public class Foo extends AbstractFoo {

    @PostConstruct
    private void doIt() {
       //
    }
}

When AbstractFoo.doIt() and Foo.doIt() will be called - what is the order?

@luk2302 I want to get canonical answer. I searched but couldn't find. — Pavel_K, Aug 27 '17 at 15:08

score 5 · Accepted Answer · answered Aug 27 '17 at 18:19

@PostConstruct is the last thing to get executed in the initialization of a given managed bean, relative to its position in the inheritance chain. From the spec

The container must ensure that:

Initializer methods (i.e. @PostConstruct) declared by a class X in the type hierarchy of the bean are called after all injected fields declared by X or by superclasses of X have been initialized.

Any @PostConstruct callback declared by a class X in the type hierarchy of the bean is called after all initializer methods declared by X or by superclasses of X have been called, after all injected fields declared by X or by superclasses of X have been initialized.

Pro Tip: With CDI 2.0, you can use @Inject to declare an initializer method as an alternative @PostConstruct and the restriction that you can have only one in a given class. The difference here is that @PostConstruct is still executed last and is the only place you can be guaranteed that all injected components will be available.

Initializer methods available in CDI 1.0 too! – Darsstar Aug 30 '17 at 12:49 — Darsstar, Aug 30 '17 at 12:49

score 0 · Answer 2 · answered May 09 '21 at 19:50

0

I believe that @PostConstruct on the parent class is not called. There can be only one @PostConstruct method. So the methods of the parent class are not inspected. You need to explicitly call it by super.doIt()

answered May 09 '21 at 19:50

Martin Večeřa

33
4

Order of @PostConstruct and inheritance

2 Answers2

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