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

[Carlos Aristu]

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] https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_graalvm_graaljs_issues_88-23issuecomment-2D453021299&d=DwIFaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=CUkXBxBNT_D5N6HMJ5T9Z6rmvNKYsqupcbk72K0lcoQ&m=SONxRA-cJWH4INLX-uDgL1Afx7XABorqPK3ite36VtA&s=Hw4Fpfxv8qQMK9XrdAcEW49J5nMi0ODhnsFdecPww3U&e= 
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Carlos Aristu López
Applications Engineer

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