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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.io;

import java.util.Map;

/**
 * DwrConvertedException are automatically exported by DWR along with the
 * message and (optionally) a map of data. It is the developers job to ensure
 * that all the objects in the data map are marked for conversion.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DwrConvertedException extends RuntimeException
{
    /**
     * @param message The message to pass to the exceptionHandler in JavaScript
     */
    public DwrConvertedException(String message)
    {
        super(message);
    }

    /**
     * @param message The message to pass to the exceptionHandler in JavaScript
     */
    public DwrConvertedException(String message, Map data)
    {
        super(message);
        this.data = data;
    }

    /**
     * @return the data
     */
    public Map getData()
    {
        return data;
    }

    private Map data;
}