Cannot call javascript's async functions from nashorn java

Question

I want to call a javascript function like the following from java using nashorn

async function testSample() {    
    for (var i = 0; i < sample.length; i++) {
        await sample[i]();
    }    
}

So it will execute all the functions in the sample variablel. But I am getting the following error

Expected ; but found function
async function testSample()() {
  ^ in <eval> at line number 8 at column number 6

Is there support for async functions on nashorn?

Any work around to solve this?

put a ; before async then try

Ayush Gupta
– Ayush Gupta

2018-11-13 08:38:25 +00:00
Commented Nov 13, 2018 at 8:38 — Ayush Gupta
– Ayush Gupta, Commented Nov 13, 2018 at 8:38
@AyushGupta: That's not going to fix the error.

Cerbrus
– Cerbrus

2018-11-13 08:39:14 +00:00
Commented Nov 13, 2018 at 8:39 — Cerbrus
– Cerbrus, Commented Nov 13, 2018 at 8:39

OhleC · Accepted Answer · 2018-11-13 12:09:48Z

6

async is defined in ECMAScript 2017; Nashorn currently only supports ECMAScript 5.1.

Therefore, you cannot directly call this code from Nashorn. You could try to rewrite it using Promises, or maybe compile it down to ES5 with something like babel.

edited Nov 13, 2018 at 12:09

answered Nov 13, 2018 at 8:38

OhleC

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4 Comments

venkat Over a year ago

So there is no way to call async methods.

OhleC Over a year ago

@venkat Not from Nashorn, no. You can try to rewrite the code using Promises or maybe transpile it to ES5 with babel.

venkat Over a year ago

Can Rhino do this? - @ohlec

OhleC Over a year ago

@venkat I don't think so. Rhino supports JavaScript 1.7, which is Mozilla's versioning system. I'm not sure what standard exactly it corresponds to, but I'm pretty sure it doesn't support async/await

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