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package javax.annotation;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * The <code>PostConstruct</code> 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 <code>PostConstruct</code> must be
 * invoked even if the class does not request any resources to be injected. Only
 * one method in a given class can be annotated with this annotation. The method
 * on which the <code>PostConstruct</code> annotation is applied must fulfill
 * all of the following criteria:
 * <ul>
 * <li>The method must not have any parameters except in the case of
 * interceptors in which case it takes an <code>InvocationContext</code> object
 * as defined by the Interceptors specification.</li>
 * <li>The method defined on an interceptor class or superclass of an
 * interceptor class must have one of the following signatures:
 * <p>
 * void &#060;METHOD&#062;(InvocationContext)
 * <p>
 * Object &#060;METHOD&#062;(InvocationContext) throws Exception
 * <p>
 * <i>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.</i></li>
 * <li>The method defined on a non-interceptor class must have the following
 * signature:
 * <p>
 * void &#060;METHOD&#062;()</li>
 * <li>The method on which the <code>PostConstruct</code> annotation is applied
 * may be public, protected, package private or private.</li>
 * <li>The method must not be static except for the application client.</li>
 * <li>The method should not be final.</li>
 * <li>If the method throws an unchecked exception the class must not be put
 * into service except in the case where the exception is handled by an
 * interceptor.</li>
 * </ul>
 *
 * @see javax.annotation.PreDestroy
 * @see javax.annotation.Resource
 * @since 1.6, Common Annotations 1.0
 */
@Documented
@Retention(RUNTIME)
@Target(METHOD)
public @interface PostConstruct {
}