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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.ui;

/**
 * A simple wrapper around a String to indicate that this string is executable
 * Javascript and should not be quoted and escaped when it is passed to the
 * client.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class CodeBlock
{
    /**
     * CodeBlocks are immutable wrappers around strings
     * @param code The javascript code block to send to the client
     */
    public CodeBlock(String code)
    {
        this.code = code;
    }

    /**
     * Accessor for the (read-only) code block
     * @return The code that this block wraps
     */
    public String getCode()
    {
        return code;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode()
    {
        return 397 + code.hashCode();
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj)
    {
        if (obj == null)
        {
            return false;
        }

        if (obj == this)
        {
            return true;
        }

        if (!this.getClass().equals(obj.getClass()))
        {
            return false;
        }

        CodeBlock that = (CodeBlock) obj;

        return this.code.equals(that.code);
    }

    /**
     * The code block to send to the client
     */
    private String code;
}