Re: InvokeBSF with ActiveScriptEngine...bug workaround/fix?

[Tom Myers <to...@dreamscape.com>]

As I said at 07:13 PM 4/25/2001 -0400,

>The org.apache.soap.server.InvokeBSF.service(..) method uses
> >       BSFManager mgr = (BSFManager) target;
> >       BSFEngine eng = mgr.loadScriptingEngine (dd.getScriptLanguage ());
> >       Object result = eng.call (null, methodName, args);
>
>which works just fine on Rhino javascript, e.g. the Calculator example; but
it blows up with the ActiveScript languages (vbscript or jscript) because 

>    ActiveScriptEngine.call(Object object, String method, Object[] args)
>
>starts with object.toString()...

I now have it working, more or less (with SOAP 2.1). I replace the problem line

        Object result = eng.call (null, methodName, args);

with a hack... if we're about to fail, build an expr and eval it instead:
-----
       Object result;
       if(!(eng instanceof com.ibm.bsf.engines.activescript.ActiveScriptEngine))
         result=eng.call (null, methodName, args);
       else { 
         StringBuffer sb = new StringBuffer(300);
         sb.append(methodName).append("(");
         if (args != null && args.length > 0) {
         sb.append(args[0].toString());
         for(int i=1; i<args.length;i++)
           sb.append(",").append(args[i].toString());
         }
         sb.append (")");
         result=eng.eval("",0,0,sb.toString());
----
This works fine, at least on the samples/calculator example. Within the 
deployment descriptor I change script language to language="vbscript"
and the javascript code to, e.g.,
----
       Public Function plus(x,y)
         plus = x + y
       End Function
----
and similarly for the other functions. No further problem. Of course
further changes may be needed if we try to call vbscript or jscript
with more complex arguments, but I would think it's better to have
a simple working example than none.

Tom Myers http://www.n-topus.com


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