Subj : Re: org.mozilla.javascript.EvaluatorException: Can't convert to type
To   : mesuti@aciworldwide.com
From : Igor Bukanov <igor@fastmail.fm>
Date : Wed Feb 25 2004 04:54 pm


This should be fixed in the forthcoming Rhino 1.5 Release 5, you may try 
release candidate 1 to see if it works for you indeed, 
http://www.mozilla.org/rhino/download.html .

As a workaround for the previous releases you will need to change the 
argument type in jsFunction_concat to Scriptable and do manual casting.

Regards, Igor

mesuti@aciworldwide.com wrote:
> 
> 
> 
> Hi,
> 
> I want to use Rhino interpreter in a Smart Card Management system as ECMA
> script interpreter. Rhino throws an exception when I call concat() method
> of a Host Object that I implemented (ByteString). A part of the source code
> can be seen below:
> 
> 
> 
> public class ByteString extends ScriptableObject {
> 
>     /** Creates a new instance of ByteString */
>     public ByteString() {
>     }
> 
>     public void jsConstructor(String s, Integer enc) {
>        ...
>     }
> 
>     public int jsGet_length() {
>        ...
>     }
> 
>     public ByteString jsFunction_concat(ByteString bs) throws IOException {
>         ByteString bs1 = new ByteString();
>         ...
> 
>         return bs1;
>     }
> 
>     public String getClassName() {
>         return "ByteString";
>     }
> }
> 
> 
> Sample JavaScript  calling the concat method is also given below:
> 
> var tmpA  = new ByteString("Text1 ", ASCII);
> var tmpB  = new ByteString("Text2", ASCII);
> var tmpC  = tmpA.concat(tmpB); // this is the problem line
> 
> 
> When Rhino evaluates the script it throws the following exception:
> 
> Evaluating JavScript D:\Data\Archive\Rhino-15R41\experiments\sample.js...
> org.mozilla.javascript.EvaluatorException: Can't convert to type
> "com.bla1.bla2.bla3.hostobjects.ByteString".
> (D:\Data\Archive\Rhino-15R41\experiments\sample.js; line 3)
>         at
> org.mozilla.javascript.DefaultErrorReporter.runtimeError(DefaultErrorReporter.java:76)
>         at
> org.mozilla.javascript.Context.reportRuntimeError(Context.java:591)
>         at
> org.mozilla.javascript.Context.reportRuntimeError(Context.java:630)
>         at
> org.mozilla.javascript.Context.reportRuntimeError1(Context.java:606)
>         at
> org.mozilla.javascript.FunctionObject.convertArg(FunctionObject.java:359)
>         at
> org.mozilla.javascript.FunctionObject.call(FunctionObject.java:408)
>         at
> org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1191)
>         at
> org.mozilla.javascript.gen.c1.call(D:\Data\Archive\Rhino-15R41\experiments\sample.js:3)
>         at
> org.mozilla.javascript.gen.c1.exec(D:\Data\Archive\Rhino-15R41\experiments\sample.js)
>         at org.mozilla.javascript.Context.evaluateReader(Context.java:820)
>         at
> com.aciworldwide.scm.gp.JSInterpreter.<init>(JSInterpreter.java:64)
>         at
> com.aciworldwide.scm.gp.JSInterpreter.main(JSInterpreter.java:117)
> 
> 
> It seems all methods with a "ByteString" argument causes the same problem.
> 
> Thanks
> 
> Ishak
>

.