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package javax.servlet;

import java.util.Set;

/**
 * Interface which allows a library/runtime to be notified of a web
 * application's startup phase and perform any required programmatic
 * registration of servlets, filters, and listeners in response to it.
 *
 * 

Implementations of this interface may be annotated with * {@link javax.servlet.annotation.HandlesTypes HandlesTypes}, in order to * receive (at their {@link #onStartup} method) the Set of application * classes that implement, extend, or have been annotated with the class * types specified by the annotation. * *

If an implementation of this interface does not use HandlesTypes * annotation, or none of the application classes match the ones specified * by the annotation, the container must pass a null Set of classes * to {@link #onStartup}. * *

When examining the classes of an application to see if they match * any of the criteria specified by the HandlesTypes annontation * of a ServletContainerInitializer, the container may run into * classloading problems if any of the application's optional JAR * files are missing. Because the container is not in a position to decide * whether these types of classloading failures will prevent * the application from working correctly, it must ignore them, * while at the same time providing a configuration option that would * log them. * *

Implementations of this interface must be declared by a JAR file * resource located inside the META-INF/services directory and * named for the fully qualified class name of this interface, and will be * discovered using the runtime's service provider lookup mechanism * or a container specific mechanism that is semantically equivalent to * it. In either case, ServletContainerInitializer services from web * fragment JAR files excluded from an absolute ordering must be ignored, * and the order in which these services are discovered must follow the * application's classloading delegation model. * * @see javax.servlet.annotation.HandlesTypes * * @since Servlet 3.0 */ public interface ServletContainerInitializer { /** * Notifies this ServletContainerInitializer of the startup * of the application represented by the given ServletContext. * *

If this ServletContainerInitializer is bundled in a JAR * file inside the WEB-INF/lib directory of an application, * its onStartup method will be invoked only once during the * startup of the bundling application. If this * ServletContainerInitializer is bundled inside a JAR file * outside of any WEB-INF/lib directory, but still * discoverable as described above, its onStartup method * will be invoked every time an application is started. * * @param c the Set of application classes that extend, implement, or * have been annotated with the class types specified by the * {@link javax.servlet.annotation.HandlesTypes HandlesTypes} annotation, * or null if there are no matches, or this * ServletContainerInitializer has not been annotated with * HandlesTypes * * @param ctx the ServletContext of the web application that * is being started and in which the classes contained in c * were found * * @throws ServletException if an error has occurred */ public void onStartup(Set> c, ServletContext ctx) throws ServletException; }





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