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XStream is a simple library to serialize objects to XML and back again. Features: Ease of use, no mappings, performance, clean XML, no modifications to classes, integration with XML libraries, full object graph support, customizable conversion strategies.
DWR is a simple servlet plugin that allows you to expose selected Java classes via JavaScript. DWR comprises a servlet to marshal requests from JavaScript and code to generate the browser code to make calling Java code directly from a web form simple. DWR can make writing interective DHTML pages (like GMail) very much simpler.
JSON-lib is a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans. It is based on the work by Douglas Crockford in http://www.json.org/java. Includes support for Groovy and JRuby as well.