existan mas de 40 frameworks en java para usar el AJAX
1 Advanced Ajax tags : SweetDEV RIA
2 ADF Faces (Apache Trinidad)
3 ADL(AJAX Dev Library) and AJAX tool In JoyiStar
4 AjaxAnywhere (from September 2005)
5 AJAX JSP Tag Library
6 AjaxTags (a subcomponent of the Java Web Parts project)
7 Ajax4jsf. AJAX for Java Server Faces Framework
8 Ajax reusable GUI Classes and “loosely coupled” component based Framework
9 Authenteo
10 Backbase AJAX for Struts
11 Backbase AJAX for JSF
12 Direct Web Remoting (DWR) (2005)
13 Echo 2 (from March 2005)
14 Guise
15 Google Web Toolkit
16 ICEfaces
17 Light Portal
18 Java2Script Pacemaker
19 Java Web Objects (May 2001)
20 jMaki (May 2006)
21 JSON-RPC-Java (April 2004)
22 JSP Controls Tag Library (December 2005)
23 jWic
24 Proficy Portal
25 SmartClient (enterprise AJAX GUI system since 2000)
26 Struts-Layout
27 SWATO (2005)
28 Tacos Tapestry Components (dec 2005)
29 Telosys : Global framework and tools for AJAX / J2EE applications ( Open Source )
30 ThinkCAP JX: RAD Environment for AJAX, J2EE, and Open Source
31 ThinWire® - Beyond Ajax (Open Source under LGPL; Free for Commercial Use; In Production Use Since 2003)
32 WebORB for Java (from August 2005)
33 Wicket (2004, Ajax support 2005)
34 WidgetServer (2004)
35 Wonder
36 XANDRA Framework SOAP and SOA Architecture
37 xulfaces (XUL render kit for JSF)
38 xWire (Released October, 2005)
39 ZK - Ajax but no JavaScript (#1 active in SourceForge)
40 BZByte EZAjax - Ajax, no javascript, no nonsense
41 Restlet mas info
http://ajaxpatterns.org/Java_Ajax_Frameworks 
