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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 boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.extend;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * JsonModeMarshallException is a hint to the conversion process that
 * we are trying to convert in JSON mode, but we've discovered recursive data.
 * TODO: This should probably be called JsonConversionException or similar
 * @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("Error marshalling type. See the logs for more details.");
        log.warn("Failure to marshall type: " + paramType.getName());

        this.paramType = paramType;
    }

    /**
     * Construct a JsonModeMarshallException 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("Error marshalling type. See the logs for more details.", ex);
        log.warn("Failure to marshall type: " + paramType.getName() + ". Due to: " + ex);

        this.paramType = paramType;
    }

    /**
     * Construct a JsonModeMarshallException 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(message);
        log.warn("Failure to marshall type: " + paramType.getName());

        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;

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(JsonModeMarshallException.class);
}