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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.util.Messages;

/**
 * JsonModeMarshallException is a hint to the conversion process that
 * we are trying to convert in JSON mode, but we've discovered recursive data.
 * So this is officially very nasty, because we are
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class JsonModeMarshallException extends RuntimeException
{
    /**
     * Default ctor
     * @param paramType The type we were trying to marshall
     */
    public JsonModeMarshallException(Class paramType)
    {
        super(Messages.getString("MarshallException.SimpleFailure", paramType.getName()));
        this.paramType = paramType;
    }

    /**
     * Construct a MarshallException with an exception and a destination type
     * @param paramType The type we were trying to marshall
     * @param ex error stack trace
     */
    public JsonModeMarshallException(Class paramType, Throwable ex)
    {
        super(Messages.getString("MarshallException.FailureWithCause", paramType.getName(), ex.getMessage()), ex);
        this.paramType = paramType;
    }

    /**
     * Construct a MarshallException with a description message and exception
     * @param paramType The type we were trying to marshall
     * @param message error description
     */
    public JsonModeMarshallException(Class paramType, String message)
    {
        super(Messages.getString("MarshallException.FailureWithCause", paramType.getName(), message));
        this.paramType = paramType;
    }
    /**
     * Accessor for the type we are converting to/from
     * @return The type we are converting to/from
     */
    public Class getConversionType()
    {
        return paramType;
    }

    /**
     * The type we are converting to/from
     */
    private Class paramType;
}