On Dec 6, 11:54 am, [EMAIL PROTECTED] wrote:
> 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
Perhaps it is a problem with the javax.script package. When I try the
equivalent with Rhino APIs, it works as expected:
[rhino] cat RunScript.java
import org.mozilla.javascript.*;
public class RunScript {
public static void main(String args[])
{
Context cx = Context.enter();
try {
Scriptable scope = cx.initStandardObjects();
Object result = cx.evaluateString(scope, "var city = null;
city;",
"<cmd>", 1, null);
System.err.println(Context.toString(result));
} finally {
Context.exit();
}
}
}
[rhino] javac -classpath build/rhino1_7R1pre/js.jar RunScript.java
Note: RunScript.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
[rhino] java -classpath build/rhino1_7R1pre/js.jar:. RunScript
null
--N
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