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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;

/**
 * An OutboundVariable that declares a JavaScript array
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ArrayOutboundVariable extends NestedOutboundVariable
{

    public ArrayOutboundVariable(OutboundContext context)
    {
        super(context);
    }

    public String getDeclareCode()
    {
        if (isInline())
        {
            return getChildDeclareCodes();
        }
        else
        {
            return getChildDeclareCodes() + "var " + getVariableName() + "=[];";
        }
    }

    public String getBuildCode()
    {
        if (isInline())
        {
            return getChildBuildCodes();
        }
        else
        {
            StringBuffer buffer = new StringBuffer(getChildBuildCodes());

            int i = 0;
            String variableName = getVariableName();
            for (OutboundVariable child : getChildren())
            {
                if (child != null)
                {
                    buffer.append(variableName);
                    buffer.append('[');
                    buffer.append(i);
                    buffer.append("]=");
                    buffer.append(child.getAssignCode());
                    buffer.append(';');
                }

                i++;
            }
            buffer.append("\r\n");

            return buffer.toString();
        }
    }

    public String getAssignCode()
    {
        if (isInline())
        {
            StringBuffer buffer = new StringBuffer();

            buffer.append("[");

            boolean first = true;
            for (OutboundVariable child : getChildren())
            {
                if (!first)
                {
                    buffer.append(',');
                }

                buffer.append(child.getAssignCode());

                first = false;
            }
            buffer.append("]");

            return buffer.toString();
        }
        else
        {
            return getVariableName();
        }
    }
}