Nexaweb, on the other hand, began as a Java-based framework for building client-server applications that connected a set of XML-defined widgets to a set of data sources through a J2EE server. It offered the kind of client-server framework that Presto now offers -- but it sent this information to a Java-based tool on the client. Now, the company has built an AJAX version for deploying the client, giving developers another pathway for your application.
I tested the mechanism by building a few mashups that pulled data from RSS feeds and a database. The tool is a pretty nice Swiss Army Knife for mixing together different data sources. The JackBe folks argue that putting so much security control into the server is a logical approach for cautious developers. Presto Edge can poll servers behind the firewall and clean up the data before sending it out to the client. Without it running interference, the only solution would be bolstering the security of each and every service you wanted to expose to the outside world.