[graalvm-users] Question about js.experimental-foreign-object-prototype option

[Steven Stewart-Gallus]

Can't you build the array on the Javascript side?

Value myArray = context.eval("[]");

and then copy to it from Java. It's probably likely to be faster to use 
JS arrays in JS land anyway.


On 24/07/19 04:25 AM, Carlos Aristu wrote:
> Hello all,
>
>   I'm currently using GraalJS to execute some javascript functions 
> from my Java code. One of this javascript functions receives an array 
> as an argument and invokes the /sort()/ method.
>
>   To invoke this function from Java, I'm creating an ArrayList and I 
> send it to through a ProxyArray, something similar to this code snippet:
>
> /      Source sources = Source.newBuilder("js", jsCode, 
> "myCode").buildLiteral();/
> /      Source function = Source.create("js", "myFunction");
> /
> /      List<String> myList = new ArrayList<>();/
> /      try (Context context = Context.newBuilder()/
> /        .engine(Engine.create())
>         .allowHostAccess(HostAccess.ALL)
>         .build()) {
>           context.eval(sources);
>           Value res = 
> context.eval(function).execute(ProxyArray.fromList(myList));
>     }/
>
>   That code fails with the following error: 
> "/org.graalvm.polyglot.PolyglotException: TypeError: invokeMember on 
> foreign object failed due to: Message not supported./"
>
>   To make it work, I need to enable the 
> /js.experimental-foreign-object-prototype /option[1] for the Context.
>
>   Being an experimental option and according to the docs, it is not 
> recommended to enable it for productive environments. My questions are:
>
>   a) ¿Is there any plan to switch this option as non-experimental?
>   b) ¿Do you know if there exists any alternative (or a better way) to 
> provide a JS array as an argument of a JS function from Java?
>
> Thank you in advance.
>
> [1] 
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> Carlos Aristu López
> Applications Engineer
>
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