CODEWITHSUNDEEP
spring
fgonzalez
fgonzalez

Reputation: 3887

@Autowiring and @Resource annotations in Spring

My question is quick, we use @Autowire to wire beans by type, and @Resource by name, but I have always seen these annotations used to wire variables inside a class, can they be used at a classlevel as well to wire all the properties of a object?

Thank you

Upvotes: 1

Views: 134

Answers (2)

Jose Luis Martin
Jose Luis Martin

Reputation: 10709

Yes, just look at code or javadoc

  • Autowired: ctor (but only one), field, method, annotation

    @Target({ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE})

  • Resource: type, field, method

    @Target({TYPE, FIELD, METHOD})

Upvotes: 0

Koitoer
Koitoer

Reputation: 19543

Let me try to answer your question with the API of the annotations.

@Retention(value=RUNTIME)
@Target(value={CONSTRUCTOR,FIELD,METHOD})
public @interface Autowired

@Target(value={TYPE,FIELD,METHOD})
@Retention(value=RUNTIME)
public @interface Resource

If you want to know when you can use the annotations go to the API and take special attention to the @Target values.

ANNOTATION_TYPE Annotation type declaration

CONSTRUCTOR Constructor declaration

FIELD Field declaration (includes enum constants)

LOCAL_VARIABLE Local variable declaration

METHOD Method declaration

PACKAGE Package declaration

PARAMETER Parameter declaration

TYPE Class, interface (including annotation type), or enum declaration

In general annotation only could be used in the places for which they are defined in the @Target values.

Upvotes: 1

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