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Jakarta RESTful Web Services
There is a newer version: 4.0.0
/*
 * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.ws.rs;

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

/**
 * Defines the default value of request meta-data that is bound using one of the following annotations:
 * {@link jakarta.ws.rs.PathParam}, {@link jakarta.ws.rs.QueryParam}, {@link jakarta.ws.rs.MatrixParam},
 * {@link jakarta.ws.rs.CookieParam}, {@link jakarta.ws.rs.FormParam}, or {@link jakarta.ws.rs.HeaderParam}. The default value
 * is used if the corresponding meta-data is not present in the request.
 * 
 * If the type of the annotated parameter is {@link java.util.List}, {@link java.util.Set} or
 * {@link java.util.SortedSet} then the resulting collection will have a single entry mapped from the supplied default
 * value.
 * 
 * 
 * If this annotation is not used and the corresponding meta-data is not present in the request, the value will be an
 * empty collection for {@code List}, {@code Set} or {@code SortedSet}, {@code null} for other object types, and the
 * Java-defined default for primitive types.
 * 
 *
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see PathParam
 * @see QueryParam
 * @see FormParam
 * @see HeaderParam
 * @see MatrixParam
 * @see CookieParam
 * @since 1.0
 */
@Target({ ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DefaultValue {

    /**
     * The specified default value.
     *
     * @return default value.
     */
    String value();
}