Java Scripting Engine importing my classes does not work

Question

A code is worth 1000 words of explaining it :-)

package jasim;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class JSTest {

    public static void main(String[] args) throws ScriptException {
        ScriptEngine jse = new ScriptEngineManager().getEngineByExtension("js");

        jse.eval("println(new jasim.JSTest().toString)");

    }

    @Override
    public String toString() {
        return "JSTest Object";
    }
}

This code will fail with the below exception:

Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: ReferenceError: "jasim" is not defined. (<Unknown source>#1) in <Unknown source> at line number 1

How do I import my own classes into the ScriptEngine?

A code is worth 1000 words of explaining it .Thumbs up

Joe.wang
– Joe.wang

2013-01-11 10:18:16 +00:00
Commented Jan 11, 2013 at 10:18 — Joe.wang
– Joe.wang, Commented Jan 11, 2013 at 10:18

Ayman · Accepted Answer · 2010-04-25 09:38:07Z

7

After looking at the Mozilla Rhino docs, the solution is either to use:

importPackage(Packages.jasim) within the script, or to use new Packages.jasim.JSTest()

This is not so clear in the Sun docs regarding the importPackage in the ScriptingEngine docs.

answered Apr 25, 2010 at 9:38

Ayman

11.6k18 gold badges70 silver badges94 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

McDowell Over a year ago

The documentation notes that "The class provides additional importPackage() and importClass() global functions for scripts but their extensive usage has tendency to pollute the global name space with names of Java classes and prevents loaded classes from garbage collection." You would probably be better off using JavaImporter.

maid450 · Accepted Answer · 2010-04-25 09:30:07Z

-4

The same way you import javax.script.ScriptEngine;...

Just make sure your classes are in the CLASSPATH

answered Apr 25, 2010 at 9:30

maid450

7,4863 gold badges40 silver badges32 bronze badges

1 Comment

Ayman Over a year ago

they are in the classpath, but not visible in the JavaScript runtime.

Collectives™ on Stack Overflow

Java Scripting Engine importing my classes does not work

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related