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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.extend;

import org.directwebremoting.WebContext;

/**
 * An interface that extends WebContext with some functions that should not
 * be used by end users, but could be useful to system extenders.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface RealWebContext extends WebContext
{
    /**
     * Fill in the page details from the servlet request.
     * This method should be used by anything that parses a batch, and then
     * allows either uses a {@link WebContext} or allows other things to use a
     * WebContext.
     * @param sentPage The URL of the current page
     * @param scriptSession The active ScriptSession
     */
    void initialize(String sentPage, RealScriptSession scriptSession);
}