Nashorn Standalone 15.3 engine returned is null

[Attila Szegedi]

I’m honestly not sure. I have this very small test program:

import javax.script.*;

public class X {
    public static void main(String[] args) throws ScriptException {
	ScriptEngineManager factory = new ScriptEngineManager(); 
	ScriptEngine engine = factory.getEngineByName("JavaScript"); 
	engine.eval("function f() { print('Hello, World!'); } f()");
    }
}

if I put it in a directory where I checked out Nashorn repo, and run “ant jar” to build the JAR file and run:

java --module-path build/nashorn/dist:build/nashorn/dependencies X.java

It prints "Hello, World!” as expected, so it definitely find the engine under the name “JavaScript". I can also run it with classpath instead of module path:

java -cp build/nashorn/dist/nashorn.jar:build/nashorn/dependencies/asm-7.3.1.jar:build/nashorn/dependencies/asm-util-7.3.1.jar X.java

and that works too. Do you have the dependencies (ASM) too?

Attila.

> On 2021. Jul 13., at 15:33, Andreas Mueller <am at iit.de> wrote:
> 
> Hi,
> 
> I’ve added Nashorn to Java 15 and it is properly displayed when listing the engines:
> 
> 2021-07-13 15:14:30.233/sys$streams/INFORMATION/starting, available Scripting Engines:
> 2021-07-13 15:14:30.246/sys$streams/INFORMATION/name=OpenJDK Nashorn, version=15.3, language name=ECMAScript, language version=ECMA - 262 Edition 5.1, names=[nashorn, Nashorn, js, JS, JavaScript, javascript, ECMAScript, ecmascript]
> 
> However, when I get the engine with name “JavaScript” it returns null:
> 
> engine = manager.getEngineByName((String) entity.getProperty("script-language").getValue());
> if (engine == null)
>     throw new Exception("Engine for script-language '" + entity.getProperty("script-language").getValue() + "' not found!");
> 
> 2021-07-13 15:14:30.361/ERROR/Exception occured: java.lang.Exception: Engine for script-language 'JavaScript' not found!
> 
> Any ideas what the problem could be?
> 
> Thanks,
> Andreas
> -- 
> Andreas Mueller
> IIT Software GmbH
> http://www.swiftmq.com <http://www.swiftmq.com> 
> 
>