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Trolltech Offers Java RIA Framework


Qt Jambi lets developers build on C++ in Java and deploy applications via browser

By Alex Handy
July 1, 2007 — 
Developers that wish to reuse code in rich Internet applications may turn to Trolltech, which in early June released Qt Jambi, a cross-platform rich client application framework and API. While Jambi was built for Java, it’s based on existing Qt C++ work, and existing C++ assets can therefore be run through the Jambi generator, producing Java components and APIs.

Trolltech is known for its Qt line of APIs, frameworks and GUI libraries. This experience has been brought to bear on Java, with the release of Qt Jambi. Naren Karattup, product director of development tools at Trolltech, said that Jambi enables cross-platform development in a manner previously unavailable to Qt users, thanks to the software’s Java underpinnings.

“It will enable developers to deliver compelling rich client cross-platform applications, with native look-and-feel, using their existing Java skills and tools, with a very high degree of desktop integration—drag-and-drop and local file system resources will work, among other things—and to do so using a mature and highly powerful API,” said Karattup. Those desktop integrations have traditionally been a sticking point for browser-based rich client applications, he added.

BROWSER OPTION
But Jambi will also allow developers to deploy their applications through a browser instead of a desktop, said Karattup. “Although the primary intended usage for Qt Jambi is to make traditional rich clients, it can also produce Web applications that can be deployed over the Web in a browser, which is one of the primary selling points.”

Jambi applications are also easier to test, he added. “Programmers get a predictable, consistent API helping them to create applications which can be deployed without having to exhaustively test on the matrix of different browsers and different platforms.”

Qt Jambi positions itself, like sandwich bread, around the Java Virtual Machine. The Java layer to which developers program sits on top of the JVM, while the C++ Qt-based foundation rides underneath, shepherding the existing interface elements and handling the hardware and operating system interactions. As a result, developers have a much greater ability to touch the computer from inside the rich clients they write.

Karattup also noted that Jambi includes Eclipse integrations, to speed development and application generation. Jambi is available now from Trolltech, and is offered under a dual license, for either commercial or open source work.


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