Combined Java And Netbeans For Mac
Ever since JDK 6, Java has shipped with a based on. This feature allowed you to embed JavaScript code into Java and even call into Java from the embedded JavaScript. Additionally it provided the capability to run JavaScript from the command line using. That was pretty good provided you didn’t require great performance and you could live with the limited ECMAScript 3 feature set.
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Starting with the JDK 8 replaces Rhino as Java’s embedded JavaScript engine. Nashorn supports the full plus some. It compiles JavaScript to Java bytecode using new language features based on, including invokedynamic, that were introduced in. This brings a 2 to 10x performance boost over the former Rhino implementation, although it is still somewhat, the engine inside Chrome and Node.js. If you are interested in details of the implementation you can have a look at these slides from the. Related Sponsor Enhance your end-user experience by optimizing your application performance.
Get a holistic view of your application behavior with. As Nashorn comes with JDK 8, it also adds very neat support for, as we shall see in more detail shortly. Let’s kick it off with a very small example. First you might want to install the JDK 8 and NetBeans, IntelliJ IDEA, or Eclipse. All of them provide at least basic support for integrated JavaScript development.
Let’s create a simple Java project consisting of the following two example files and let the program run: (Click on the image to enlarge it). I think the question is answered by the benchmark provided in the original article: In the benchmark sited 'Cold' (or interpreted / first-time) runs of JS with Nashorn is slower than Rhino. However, with 'warm' (once the JVM has time to optimize the bytecode) performance the performance is dramatically faster.
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----------- The test you are citing would always hit the cold case since it is doing a 'static' compile of a LESS to CSS. This is a one-time (or once at app-startup) operation. Given the original benchmark - one would expect THIS to be SLOWER than Rhino.
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However, if you are running a server like Vert.X or NodeJS (where the same code is hit over-and-over again) you should see dramatically better performance. ---------- That said, where I would love to use Nashorn is for JS uglification or CSS compilation utilizing Node.JS stack tools for my legacy JEE applications. Given the benchmarks, it is interesting (as you point out) that performance would be SLOWER than Rhino - as these are one time operations. It looks like a bit of work is still needed to optimize Nashorn for these use cases.