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Project Nashorn to Make Java, JavaScript Work Together


Oracle is putting its weight behind a new project aimed at making JavaScript work better with Java. Dubbed Project Nashorn, its goal is “to implement a lightweight high-performance JavaScript runtime in Java with a native JVM.”

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By: Terri Wells
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December 20, 2012

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Oracle is putting its weight behind a new project aimed at making JavaScript work better with Java. Dubbed Project Nashorn, its goal is “to implement a lightweight high-performance JavaScript runtime in Java with a native JVM.”

You can check out details of the project here. Announced late last month, Project Nashorn boasts Jim Laskey from Oracle as the lead. The plan involves starting from scratch, using entirely new code. The initial source for it will come from an internal Oracle project. When complete, the project is supposed to let Java programmers embed JavaScript in Java apps using JSR-223 and develop freestanding JavaScript apps using the jrunscript command line.

So what will go into this project? Oracle's John Coomes, who posted the new project, explained that “The scope of this project will include, but is not limited to, a parser API for scanning JavaScript source code, a compiler to convert ASTs from the parser to JVM byte code, and a runtime to support the execution of said generated byte code. Execution of JavaScript in this environment will be in conformance with ECMA-262 Edition 5.1 and will adapt to newer guidelines as standards evolve.”

The vote on whether to proceed with Project Nashorn was closed on midnight December 6. With 20 yeas, no vetoes, and no abstentions, the vote carried. The project now has its own page on OpenJDK. The project page gives a fuller historical context: “This Project is designed to take full advantage of newer technologies for native JVMs that have been made since the original development of JVM-based JavaScript with was started in 1997 by Netscape and maintained by Mozilla.”

Nashorn also has its own blog, run on an Oracle domain, but as of this writing it isn't very active. The last post, from Laskey himself, reported the results of the vote. But the two posts before that one gave copious examples of how Nashorn might work. Specifically, Laskey wanted to see how the name “Nashorn” was trending on the Internet, so he decided to write a program to count tweets. Using Nashorn with Java, he took advantage of the Twitter4J Java library and wrote a single line of code to start off his app. He then tied it to JavaFX to graph the result, and had to jump through some hoops to create the application. You can check out the specific blog entry for the full details.


So what, exactly, is the advantage of making Java and JavaScript work better together? Gavin Clarke writing for The Register, notes that “JavaScript runs in a browser but it execute in a JVM on the client or server has some benefits. It means apps written using JavaScript code can take advantage of a device or a server's CPU or GPU in performance.” This means that a JavaScript application won't be stuck depending on just the level of performance that the browser can give it.

Additionally, mixing Java and JavaScript could help Java to stay relevant. JavaScript isn't dying out any time soon, thanks to its ubiquitous usage in web-based programming. The problem is, it doesn't always run well on the server. Yes, you can use frameworks such as Node.JS, Jaxer, and Narwhal, but these often don't scale well. Project Nashorn could, potentially, be made to scale – depending on the enthusiasm it generates among open source programmers eager to work on it. As Clarke observes, “An official project from the OpenJDK at least stands the chance of becoming something people agree on using, and could offer the industry an alternative that attracts critical mass and which isn’t subject to the waxing and waning fads of frameworks and languages.” 


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