How to debug JavaScript program using Nashorn?

Question

I need to be able to Debug JS code run by Nashorn i.e:

ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine engine = sem.getEngineByName("nashorn");
engine.eval("load (\"src/com/sap/rdl/runjs/file.js\");");

Now I need to add a breakpoint in the JS file and be able to step through the lines programmatically (implement a debugger).

I know intelliJ and NetBeans implemented this so it should be possible, yet I cannot find any API in Nashorn that allows stepping and/or mapping of lines or variables.

Any advice/links would be most welcome. Thanks in advance.

Have the same problem - stackoverflow.com/questions/25791772/… . The ide stackoverflow answer I referenced there may be helpful to you. — Steve B.
– Steve B., Commented Sep 11, 2014 at 15:47
@planty182: web.archive.org/web/20150426130812/http://stackoverflow.com/… — Mathieu Larose
– Mathieu Larose, Commented Feb 23, 2016 at 19:52

Vik Gamov · Accepted Answer · 2014-09-09 17:30:48Z

5

You can debug your code in Intellij IDEA.

http://blog.jetbrains.com/idea/2014/03/debugger-for-jdk8s-nashorn-javascript-in-intellij-idea-13-1/

Also, you can try to use askari. It's a prototype that allow you to step through JavaScript code

https://github.com/wickund/nashornexamples/tree/master/askari

Cheers, Vik

answered Sep 9, 2014 at 17:30

Vik Gamov

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2 Comments

Sergey Kuperman Over a year ago

I need to do it programmatically - meaning i need to write code that does it not use some IDE to do it. We are implementing a debugger so i do need to reinvent the weel here :) any articles/ relevant people contacts would be most welcome

wickund Over a year ago

Nashorn uses the jvmdi API for debugging with additional support provided in Nashorn's Debugger support class.

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