Java Programming

I apologize if this would be better suited for another forum on this board, but I cannot find one for non-core API's.

My problem is with the JACOB (Java-COM Bridge) API. If anyone has experience with this, your input would be greatly appreciated.

Here is my code:

377        ActiveXComponent wordComponent = new ActiveXComponent (
378                "Word.Application");
379        Dispatch wordObject = wordComponent.getObject();
380        wordComponent.setProperty("Visible", new Variant (true));
381        Dispatch documents = Dispatch.get(wordObject, 
382                "Documents").toDispatch();
383        Dispatch document = Dispatch.call(documents, 
384                "add", envelopeFile).toDispatch();
385        Dispatch.call(document, "Activate");
386        Dispatch activeDocument = Dispatch.get(wordObject, 
387                "ActiveDocument").toDispatch();

On line 384 I get the error:

com.jacob.com.ComFailException: VariantChangeType failed

When I try to break the line into multiple, independent commands, I get the same error on the last line of the following:

        Variant document1 = Dispatch.call(documents, 
                "add", envelopeFile);
        Dispatch document = document1.toDispatch();

For some reason, it can't change the type from Variant to Dispatch. This all works perfectly fine for me using the Eclipse IDE, but when I export it to a JAR, sign it, and use it in an HTML page, I get this error. Any advice? Thanks!