I've written a very simple JUnit test to illustrate my problem.
import java.util.HashMap;
import java.util.Map;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import junit.framework.TestCase;
public class ScriptEngineTest extends TestCase {
public void testNull() throws ScriptException {
Map globals = new HashMap();
javax.script.ScriptEngineManager manager = new
javax.script.ScriptEngineManager();
ScriptEngine engine = manager.getEngineByExtension("js");
Object o = engine.eval("var city = null; city;");
assertNull(o);
}
}
I would expect the returned object 'o' to be null. Unfortunately,
engine.eval always throws the following error:
org.mozilla.javascript.EcmaError: ReferenceError: "city" is not
defined. (<Unknown source>#1)
at
org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:
3350)
at
org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:
3340)
at
org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:
3413)
What am I doing wrong? When I run this same statement through
Firefox's Error Console, it returns null as I would expect.
I'm using the Scripting JSR libraries because I'm running under Java
5, not Java 6. Other statements evaluate as I would expect, the only
problems seem to occur with null values. I've tried the code with
js-1.6R5 that comes with the JSR libraries and I've also tried
upgrading to js-1.6R7. The result is the same.
Help! Its driving me nuts. I need to have nullable values.
-Tom
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