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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.servlet;

import org.directwebremoting.Container;
import org.directwebremoting.extend.Handler;

/**
 * Various constants from generating output.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface PathConstants
{
    /**
     * When we prime the {@link Container} with URLs for {@link Handler}s we use
     * a prefix so the {@link UrlProcessor} knows that this is a URL and not
     * some other property
     */
    public static final String PATH_PREFIX = "url:";

    /**
     * When we prime the {@link Container} with ResponseHandlers for {@link Handler}s we use
     * a prefix so the {@link UrlProcessor} knows what to look for.
     */
    public static final String RESPONSE_PREFIX = "response:";

    /**
     * Help page name
     */
    public static final String FILE_HELP = "/help.html";

    /**
     * Extension for javascript files
     */
    public static final String EXTENSION_JS = ".js";

    /**
     * The position of web.xml
     */
    public static final String RESOURCE_WEB_XML = "/WEB-INF/web.xml";
}