Nashorn Javascript debugging with CompiledScript?

Question

It seems mandatory to use the load(filename) Nashorn extension when wanting to be able to debug both Java and Javascript in an IDE, see e.g. Debugging Nashorn JavaScript with Intellij

Unfortunately, this prohibits the use of CompiledScript, as the above returns a ScriptObjectMirror object, and at least no compile(filename) Nashorn extension is documented.

One of the CompiledScript functionalities being lost here is e.g. CompiledScript.eval(ScriptContext context). I couldn't find a way of achieving the same using ScriptObjectMirror. Also, load(filename) will immediately execute the script, which may not be wanted.

See also github.com/aperto/sourceurl-resourcefilter for a Maven Resource Filter that will add //@ sourceURL= annotations automatically to JS source files. This will result in file names being displayed in Nashorn JS stackframes in the Netbeans debugger, even when load() is not used, e.g. with CompiledScript. — jfrantzius
– jfrantzius, Commented Oct 24, 2016 at 20:25

Community · Accepted Answer · 2017-05-23 12:16:44Z

2

You can debug any Nashorn/JavaScript with IDEs using this ->

https://blogs.oracle.com/sundararajan/entry/remote_debugging_of_nashorn_scripts

introduce "debugger" statement in your script
Use your IDE to insert breakpoint in jdk.nashorn.internal.runtime.ScriptRuntime.DEBUGGER method
start "Debug" in your IDE

See also for IntelliJ: https://stackoverflow.com/a/38513981/3189360

With the recent NetBeans builds, the second part is not needed. NetBeans will automatically break into any "debugger" statement.

See https://twitter.com/sundararajan_a/status/773375676103602178

edited May 23, 2017 at 12:16

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answered Oct 7, 2016 at 3:50

A. Sundararajan

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4 Comments

jfrantzius Over a year ago

Thx, but setting a break point wasn't my problem, as I can already put it in the Java exception that is being thrown in my case. What I am looking for is stack frames corresponding to .js source lines, and .js source being shown when selecting those stack frames. Otherwise I have no clue what variables I am looking at :)

A. Sundararajan Over a year ago

Well, NetBeans shows source (even when "eval"ed from a String) when that breakpoint hits. And stack frames in stack traces have to use artificial name - as there is no name associated by user. Not much can be done there. But, Nashorn implement @sourceURL / #sourceURL directives. ( bugs.openjdk.java.net/browse/JDK-8032068 ). That is useful to associate a readable name for eval'ed sources.

jfrantzius Over a year ago

NetBeans is the next thing I'll try, as IDEA has a bug when debugging maven dependencies. Do you per chance know whether NetBeans will show sources also on CompiledScript invocations, i.e. without using load()?

jfrantzius Over a year ago

OK NetBeans debugging works perfect, also on CompiledScript (as long as // @ sourceURL =... annotation is present). Thx!

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