1 /*
   2  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.annotation;
  27 
  28 import java.lang.annotation.*;
  29 import static java.lang.annotation.ElementType.*;
  30 import static java.lang.annotation.RetentionPolicy.*;
  31 
  32 /**
  33  * The PostConstruct annotation is used on a method that needs to be executed
  34  * after dependency injection is done to perform any initialization. This
  35  * method MUST be invoked before the class is put into service. This
  36  * annotation MUST be supported on all classes that support dependency
  37  * injection. The method annotated with PostConstruct MUST be invoked even
  38  * if the class does not request any resources to be injected. Only one
  39  * method can be annotated with this annotation. The method on which the
  40  * PostConstruct annotation is applied MUST fulfill all of the following
  41  * criteria:

  42  * <ul>
  43  * <li>The method MUST NOT have any parameters except in the case of
  44  * interceptors in which case it takes an InvocationContext object as
  45  * defined by the Interceptors specification.</li>
  46  * <li>The method defined on an interceptor class MUST HAVE one of the
  47  * following signatures:
  48  * <p>
  49  * void <METHOD>(InvocationContext)
  50  * <p>
  51  * Object <METHOD>(InvocationContext) throws Exception
  52  * <p>
  53  * <i>Note: A PostConstruct interceptor method must not throw application
  54  * exceptions, but it may be declared to throw checked exceptions including
  55  * the java.lang.Exception if the same interceptor method interposes on
  56  * business or timeout methods in addition to lifecycle events. If a
  57  * PostConstruct interceptor method returns a value, it is ignored by
  58  * the container.</i>
  59  * </li>
  60  * <li>The method defined on a non-interceptor class MUST HAVE the
  61  * following signature:
  62  * <p>
  63  * void <METHOD>()
  64  * </li>
  65  * <li>The method on which PostConstruct is applied MAY be public, protected,
  66  * package private or private.</li>
  67  * <li>The method MUST NOT be static except for the application client.</li>
  68  * <li>The method MAY be final.</li>
  69  * <li>If the method throws an unchecked exception the class MUST NOT be put into
  70  * service except in the case of EJBs where the EJB can handle exceptions and
  71  * even recover from them.</li></ul>
  72  *
  73  * @see javax.annotation.PreDestroy
  74  * @see javax.annotation.Resource
  75  * @since 1.6, Common Annotations 1.0
  76  */
  77 @Documented
  78 @Retention (RUNTIME)
  79 @Target(METHOD)
  80 public @interface PostConstruct {
  81 }
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