A DESCRIPTION OF THE PROBLEM :
When a property lookup is performed on an object backed by a JSObject (or AbstractJSObject) implementation, and the property name contains at least a left parenthesis, the corresponding getMember method is not called by the engine.

In JSObjectLinker, the presence of a left parenthesis seems to be treated as an indication that an exact method with a certain signature should be called on the JSObject instead. However, the main point for implementing a custom JSObject (instead of just exposing a plain Java object) is to control exactly how the object behaves in script code.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
* Extend from AbstractJSObject and override the getMember method.
* Put an instance of that implementation into a Bindings.
* Evaluate a script that tries to access a property name with parentheses.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The custom getMember method is called.
ACTUAL -
The custom getMember method is not called. Instead, the property access expression simply returns null in the script.

---------- BEGIN SOURCE ----------
import javax.script.ScriptEngine;

import jdk.nashorn.api.scripting.AbstractJSObject;
import jdk.nashorn.api.scripting.NashornScriptEngineFactory;

public class ParenthesisInPropertyName {

    public static class TestJsObject extends AbstractJSObject {

        @Override
        public Object getMember(String name) {
            System.out.println("Member called: " + name);
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        ScriptEngine engine = new NashornScriptEngineFactory().getScriptEngine();
        engine.put("test", new TestJsObject());
        engine.eval("test['foo bar']"); // Member called: foo bar
        engine.eval("test['foo(bar)']"); // Nothing happens
    }
}
---------- END SOURCE ----------

FREQUENCY : always