problem calling custom java class from ecmascript

[Jeffrey Hau]

Hi all,
I am just starting with batik and try to run a very simple script  
within a SVG document. The script is just the function below,

function callJava() {
     var cx = Packages.org.mozilla.javascript.Context.enter();
     alert(cx);
}
but when i run this within the squiggle browser, i get the following  
error

TypeError: [JavaPackage org.mozilla.javascript.Context.enter] is not a  
function. (Inline <script> file:/Projects/svg/lines.svg:6; line 3)
	at  
org.mozilla.javascript.NativeGlobal.constructError(NativeGlobal.java: 
597)
	at  
org.mozilla.javascript.NativeGlobal.constructError(NativeGlobal.java: 
557)
	at  
org.mozilla.javascript.NativeGlobal.typeError1(NativeGlobal.java:567)
	at org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1182)

(rest of the trace omitted)
the code execute ok within the standalone rhino shell, so i think this  
is probably a classpath setting problem.
i try runnning the browser in the batik installation directory by

java -jar batik-squiggle.jar
and also (as a user suggested in an earlier post),
java -cp batik-squiggle.jar:lib/js.jar  
org.apache.batik.apps.svgbrowser.Main

but neither works, can anyone help?
thanks very much
Jeff
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