Nashorn integration with third party libraries

[Edmond Kemokai]

I don't see how what you are trying to do could work. You are executing the
jquery script in a context that lacks the key variables such as document
which jquery relies on. JQuery is for DOM manipulation primarily, as your
error source indicates, there's no document for jquery to act on.




On Fri, Apr 18, 2014 at 4:24 AM, Rémi Barraquand <dev at remibarraquand.com>wrote:

> Hi all,
>
> I might not be the first person to ask such question but I didn't found
> that much information regarding my issue on the official Nashorn page.
>
> *Context*: In an open-source project I'm working on, I'm using JavaFx
> WebView to develop a client application written mostly in JavaScript
> (RequireJS, Backbone, JQuery, Handlebars, etc). The application is running
> perfectly. I nevertheless want to add a Command-Line Interface (CLI) to let
> users interact with the application (in my case access a compiler written
> in JS) from their terminal without having to open a windowed interface
> (GUI). I therefore want to execute some JS code without the use of the
> JavaFx WebView. As a result I'm trying to make use of Nashorn!
>
> *Problem*: The code I'm trying to execute in the Nashorn script engine is
> using third party libraries such as Backbone Models and JQuery for the
> generation and manipulation of HTML (I do not need to render anything, just
> to generate HTML). I therefore tried to load JQuery library within Nashorn
> but I got a strange error...
>
> The code:
>
> |>  ScriptEngine engine  = manager.getEngineByName("nashorn");
>
>>  engine.eval(new InputStreamReader(CLI.class.getResourceAsStream("/io/
>> dahuapp/core/scripts/jquery.js")));
>>
> |
>
> The error:
>
> |--- ERROR ---
>    Exception in thread "main" javax.script.ScriptException: TypeError:
> Cannot read property "defaultView" from undefined in<eval>  at line number
> 1010
> at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(
> NashornScriptEngine.java:564)
> at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(
> NashornScriptEngine.java:548)
> at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(
> NashornScriptEngine.java:528)
> at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(
> NashornScriptEngine.java:524)
> at jdk.nashorn.api.scripting.NashornScriptEngine.eval(
> NashornScriptEngine.java:189)
> at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:249)
> at io.dahuapp.cli.CLI.main(CLI.java:45)
> Caused by:<eval>:1010 TypeError: Cannot read property "defaultView" from
> undefined
>     at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:56)
>     at jdk.nashorn.internal.runtime.ECMAErrors.typeError(
> ECMAErrors.java:212)
>     at jdk.nashorn.internal.runtime.ECMAErrors.typeError(
> ECMAErrors.java:184)
>     at jdk.nashorn.internal.runtime.ECMAErrors.typeError(
> ECMAErrors.java:171)
>     at jdk.nashorn.internal.runtime.Undefined.lookupTypeError(
> Undefined.java:128)
>     at jdk.nashorn.internal.runtime.Undefined.lookup(Undefined.java:113)
>     at jdk.nashorn.internal.runtime.linker.NashornLinker.
> getGuardedInvocation(NashornLinker.java:98)
>     at jdk.internal.dynalink.support.CompositeTypeBasedGuardingDyna
> micLinker.getGuardedInvocation(CompositeTypeBasedGuardingDyna
> micLinker.java:176)
>     at jdk.internal.dynalink.support.CompositeGuardingDynamicLinker
> .getGuardedInvocation(CompositeGuardingDynamicLinker.java:124)
>     at jdk.internal.dynalink.support.LinkerServicesImpl.
> getGuardedInvocation(LinkerServicesImpl.java:144)
>     at jdk.internal.dynalink.DynamicLinker.relink(DynamicLinker.java:232)
>     at jdk.nashorn.internal.scripts.Script$\^eval\_$4._L38$_L563$_
> L1007(<eval>:1010)
>         at jdk.nashorn.internal.scripts.Script$\^eval\_$4.scopeCall-
> 14(<eval>)
>             at jdk.nashorn.internal.scripts.Script$\^eval\_$4._L38$_L563(<
> eval>:2503)
>                 at jdk.nashorn.internal.scripts.Script$\^eval\_$2.$split(<
> eval>:563)
>                     at jdk.nashorn.internal.scripts.
> Script$\^eval\_._L38(<eval>)
>                         at jdk.nashorn.internal.scripts.
> Script$\^eval\_._L15(<eval>:34)
>                             at jdk.nashorn.internal.scripts.
> Script$\^eval\_.runScript(<eval>:15)
>                                 at jdk.nashorn.internal.runtime.
> ScriptFunctionData.invoke(ScriptFunctionData.java:498)
>                                 at jdk.nashorn.internal.runtime.
> ScriptFunction.invoke(ScriptFunction.java:206)
>                                 at jdk.nashorn.internal.runtime.
> ScriptRuntime.apply(ScriptRuntime.java:378)
>                                 at jdk.nashorn.api.scripting.
> NashornScriptEngine.evalImpl(NashornScriptEngine.java:546)
>                                 ... 5 more
> --- END ERROR ---
> |
>
> I tracked the error down in the JQuery code and the error is coming from
> the block:
>
> |setDocument = Sizzle.setDocument = function( node ) {
>     var hasCompare,
>         doc = node ? node.ownerDocument || node : preferredDoc,
>         **parent = doc.defaultView;** // *ERROR*
>
>     // If no document and documentElement is available, return
>     if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
>         return document;
>     }
>
>     ....
> |
>
> *Question*:
>
> 1. is it possible to load any third party library within Nashorn ?
> 2. does someone tried to load JQuery inside Nashorn ?
> 3. does someone have an idea from where this error might come from?
>
> Thanks,
> Rémi
>
> --
> Rémi Barraquand, Phd
> VP of Engineering at Carnot-LSI
> http://remibarraquand.com
>
>
>


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