raise ecmascript error from JSObject

Sundararajan Athijegannathan sundararajan.athijegannathan at oracle.com
Tue Jan 31 17:03:29 UTC 2017

Hope the following sample code helps you...


import javax.script.*;
import jdk.nashorn.api.scripting.*;

public class Main {
   private static JSObject errorCtr;

   public static void main(String[] args) throws Exception {
      ScriptEngine e = new ScriptEngineManager().getEngineByName("nashorn");
      // save JS Error constructor which is used later to construct 
Error object
      errorCtr = (JSObject)e.eval("Error");
      e.put("func", new MyFunc());
      e.eval("try { func() } catch(e) { print(e); print(e.stack); } ");

   public static class MyFunc extends AbstractJSObject {
       public boolean isFunction() { return true; }

       public Object call(Object self, Object... args) {
           // this is like "var e = new Error('myErrorMsg')" in JS code
           JSObject error = (JSObject)errorCtr.newObject("myErrorMsg");
           // equivalent to "throw e;"
           throw (RuntimeException)error.getMember("nashornException");

On 31/01/17, 10:04 PM, Attila Sari wrote:
> Hi all,
> Is it possible to throw ecmascript error from JSObject methods? (that can
> be catched later in the script, and will be enriched with filename and line
> number)
> Thanks,
> Attila Sari

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