CODEWITHSUNDEEP
springinheritancecollectionsdependency-injection
smp7d
smp7d

Reputation: 5032

Spring Inject Collection From Superclass

I have the following scenario:

class Super{
    private List<String> someStringsThatWillBeDifferentForEveryInstancePerDerivedType;
}

@Component
class Derived1 extends Super{
    @Autowired
    private String name;
}

@Component
class Derived2 extends Super{
    @Autowired
    private Long configId;
}

I have a different List defined as Spring bean in xml for each derived class…call them listForDerived1 and listForDerived2. How can I wire these lists into my derived classes? I attempted constructor injection but I can't seem to find any luck injecting both the collection and the other deps.

Upvotes: 0

Views: 760

Answers (1)

JWK
JWK

Reputation: 750

You can use constructor injection with @Qualifier.

class Super {
    private List<String> someStrings;

    public Super(private List<String> someStrings) {
        this.someStrings = someStrings;
    }
}

@Component
class Derived1 extends Super {
    @Autowired
    public Derived1(@Qualifier("listForDerived1") List<String> listForDerived1, OtherBean bean) {
        super(listForDerived1);
    }
}

@Component
class Derived2 extends Super {
    @Autowired
    public Derived1(@Qualifier("listForDerived2") List<String> listForDerived1, OtherBean bean) {
        super(listForDerived2);
    }
}

Also see official Spring doc: http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#beans-autowired-annotation-qualifiers

Upvotes: 2

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