@PostConstruct 注解

@PostConstruct 注解

 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
   */

 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 EJB
  * interceptors   in which case it takes an InvocationC ontext object as
  * defined by the EJB   specification.
  * - The return type of the method MUST be void.
  * - The method MUST NOT throw a checked exception.
  * - 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 {
 }