org.springframework.beans.factory.annotation

Annotation Type Value

@Target(value={FIELD,METHOD,PARAMETER,ANNOTATION_TYPE})
 @Retention(value=RUNTIME)
 @Documented
public @interface Value

Annotation used at the field or method/constructor parameter level that indicates a default value expression for the annotated element.

Typically used for expression-driven or property-driven dependency injection. Also supported for dynamic resolution of handler method arguments — for example, in Spring MVC.

A common use case is to inject values using #{systemProperties.myProp} style SpEL (Spring Expression Language) expressions. Alternatively, values may be injected using ${my.app.myProp} style property placeholders.

Note that actual processing of the @Value annotation is performed by a BeanPostProcessor which in turn means that you cannot use @Value within BeanPostProcessor or BeanFactoryPostProcessor types. Please consult the javadoc for the AutowiredAnnotationBeanPostProcessor class (which, by default, checks for the presence of this annotation).

Since:

3.0

Author:

Juergen Hoeller

See Also:

AutowiredAnnotationBeanPostProcessor, Autowired, BeanExpressionResolver, AutowireCandidateResolver.getSuggestedValue(org.springframework.beans.factory.config.DependencyDescriptor)

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	value The actual value expression such as #{systemProperties.myProp} or property placeholder such as ${my.app.myProp}.

Element Detail

value

public abstract String value

The actual value expression such as #{systemProperties.myProp} or property placeholder such as ${my.app.myProp}.