javax.annotation.PostConstruct Maven / Gradle / Ivy

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package javax.annotation;

import java.lang.annotation.*;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * The PostConstruct annotation is used on a method that needs to be executed 
 * after dependency injection is done to perform any initialization. This 
 * method MUST be invoked before the class is put into service. This 
 * annotation MUST be supported on all classes that support dependency 
 * injection. The method annotated with PostConstruct MUST be invoked even 
 * if the class does not request any resources to be injected. Only one 
 * method can be annotated with this annotation. The method on which the 
 * PostConstruct annotation is applied MUST fulfill all of the following 
 * criteria:
 * 
 * 

 * The method MUST NOT have any parameters except in the case of 
 * interceptors in which case it takes an InvocationContext object as 
 * defined by the Interceptors specification.
 * The method defined on an interceptor class MUST HAVE one of the 
 * following signatures:
 * 
 * void <METHOD>(InvocationContext)
 * 

 * Object <METHOD>(InvocationContext) throws Exception
 * 

 * Note: A PostConstruct interceptor method must not throw application 
 * exceptions, but it may be declared to throw checked exceptions including 
 * the java.lang.Exception if the same interceptor method interposes on 
 * business or timeout methods in addition to lifecycle events. If a 
 * PostConstruct interceptor method returns a value, it is ignored by 
 * the container.
 * 
 * The method defined on a non-interceptor class MUST HAVE the 
 * following signature:
 * 
 * void <METHOD>()
 * 
 * The method on which PostConstruct is applied MAY be public, protected, 
 * package private or private.
 * The method MUST NOT be static except for the application client.
 * The method MAY be final.
 * If the method throws an unchecked exception the class MUST NOT be put into   
 * service except in the case of EJBs where the EJB can handle exceptions and 
 * even recover from them.
 * @since Common Annotations 1.0
 * @see javax.annotation.PreDestroy
 * @see javax.annotation.Resource
 */
@Documented
@Retention (RUNTIME)
@Target(METHOD)
public @interface PostConstruct {
}