Sunday, September 15, 2013

Nashorn Javascript Engine with JDK8 - Hello World

In the upcoming JDK8 release a new Javascript engine called Nashorn will be included. Together with a new command line program called "jjs" it is trivial to write applications in Javascript which in turn can utilize any JVM based library.

Lund Cathedral, Skåne, Sweden

A hello world application could look like this:

java.lang.System.out.println("hello world");

This line should be put into a file called 'hello.js' and then you can start the Nashorn engine by issuing following command:

$JAVA_HOME/bin/jjs hello.js

Embedding javascript code in Scala applications is also easy by using the JSR223.

For a more detailed discussion on this topic you can read the Java Scripting Programmer's Guide or skim through this slides by Attila Szegedi. Maybe you stop by the nice blog post from Felix Bembrick how to combine Nashorns superpowers with JavaFX canvas to get an idea what can be possible.

Of course, there are other approaches to combine Scala and Javascript, but this is another story ...

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