Subj : Re: e4x Rhino question
To   : Francis Sullivan
From : Igor Bukanov
Date : Thu Sep 23 2004 04:15 pm

[Note: the message is cross-posted to netscape.public.mozilla.jseng 
newsgroup.]

Which version of JVM do you use? For E4X implementation Rhino uses 
http://xmlbeans.apache.org/. Their xmlbean.jar includes for convenience 
javax.xml.namespace.QName which is provided in J2EE 1.4.* as well.

AFAIK some earlier J2EE distributions included a version of 
javax.xml.namespace.QName without getPrefix() so if that class takes 
precedence over the one supplied in xmlbean.jar, then the code obviously 
would not work.

Regards, Igor

Francis Sullivan wrote:
> Hi Igor,
> 
>  
> 
> First, let me say that I’m really impressed with E4X Rhino.  It is such 
> an obviously better way to process XML from javascript.
> 
>  
> 
> I have a question that you might be able to point me in the right 
> direction to track down:
> 
>  
> 
> I have narrowed this down to a very simple script that is trying to 
> iterate through attributes name, value pair:
> 
>  
> 
> var vxml =  <?xml version="1.0" ?>
> 
> <!--some comment -->
> 
> <a aAttr1="a1" aAttr2="a2" aAttr3="a3" aAttr4="a4" aAttr5="a5">
> 
> <b bAttr1="b1" bAttr2="b2" bAttr3="b3" bAttr4="b4" bAttr5="b5" />
> 
> <c cAttr1="c1" cAttr2="c2" cAttr3="c3" cAttr4="c4" cAttr5="c5" />
> 
> </a>;
> 
>  
> 
> var hm = java.util.HashMap();
> 
> for each (var a in vxml.attributes()) {
> 
>             print ("X=" + a);
> 
>             hm.put(a.name(), a);
> 
> }
> 
> print (hm);
> 
>  
> 
>  
> 
> It works just fine when I run it through the javascript shell:
> 
> c:/rhino1_6R1(555)$ java -cp "js.jar;xbean.jar" 
> org.mozilla.javascript.tools.shell.Main  /temp/test.js
> 
> X=a1
> 
> X=a2
> 
> X=a3
> 
> X=a4
> 
> X=a5
> 
> {aAttr4=a4, aAttr3=a3, aAttr2=a2, aAttr1=a1, aAttr5=a5}
> 
>  
> 
>  
> 
> However, we have some code that embeds Rhino, and I get the following 
> exception:
> 
> X=a1
> 
> java.lang.NoSuchMethodError: 
> javax.xml.namespace.QName.getPrefix()Ljava/lang/String;
> 
>             at org.mozilla.javascript.xmlimpl.XML.name(XML.java:2332)
> 
>             at 
> org.mozilla.javascript.xmlimpl.XMLObjectImpl.execIdCall(XMLObjectImpl.java:565)
> 
>             at 
> org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:122)
> 
>             at 
> org.mozilla.javascript.xmlimpl.XMLList.call(XMLList.java:1578)
> 
>             at 
> org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2613)
> 
>             at 
> org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:143)
> 
>             at 
> org.mozilla.javascript.ScriptRuntime.evalSpecial(ScriptRuntime.java:2223)
> 
>             at 
> org.mozilla.javascript.ScriptRuntime.callSpecial(ScriptRuntime.java:2079)
> 
>             at 
> org.mozilla.javascript.optimizer.OptRuntime.callSpecial(OptRuntime.java:201)
> 
>             at 
> org.mozilla.javascript.gen.c2._c1(InstrumentationExecutive.js:63)
> 
>             at 
> org.mozilla.javascript.gen.c2.call(InstrumentationExecutive.js)
> 
>             at 
> org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2771)
> 
>             at 
> org.mozilla.javascript.gen.c2.call(InstrumentationExecutive.js)
> 
>             at 
> org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1518)
> 
>             at 
> org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1497)
> 
>  
> 
>  
> 
> Naturally, I’m assuming that I am not embedding Rhino Properly, but the 
> call to the name() function on an attribute croaks in the embedded 
> version.  Do you have any idea what I might be doing wrong?
> 
>  
> 
> The code that embeds rhino runs a couple of javascript scripts, the 
> second of which evals the above code fragment.
> 
>  
> 
>                                      // Begin JavaScript
> 
>                                     Context cx = Context.enter();
> 
>  
> 
>                                     // Initialize the standard objects 
> (Object, Function, etc.)
> 
>                                     // This must be done before scripts 
> can be executed.
> 
>                                     Scriptable scope = 
> cx.initStandardObjects(null);
> 
>  
> 
>                                     // Now we can evaluate a script. 
> Let's create a new object
> 
>                                     // using the object literal notation.
> 
>                                     Object result = null;
> 
>                                     try
> 
>                                     
> {                                                                                                           
>  
> 
>                                                 String code = 
> getScriptCode(“script1.js”);
> 
>                                                 String code2 = 
> getScriptCode(“script2.js”);
> 
>                                                 result = 
> cx.evaluateString(scope, code2, “script2.js”, 1, null);
> 
>                                                 result = 
> cx.evaluateString(scope, code, “script1.js”, 1, null);
> 
>                                                 Object[] args = new 
> Object[] { “arg1”, “arg2”, null};
> 
>                                                 result = 
> ScriptableObject.callMethod(scope, "myMethod", args);
> 
>                                     }
> 
>                                     catch (JavaScriptException jse)
> 
>                                     {
> 
>                                                 jse.printStackTrace();
> 
>                                     }
> 
>  
> 
>                                     Context.exit();
> 
>  
> 
> Thanks for any help on this, and again, great work!
>

.