[Actionframework-users] patch to AFWException.java

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A useful addition to AFWException.java is:

   /**
    * Like printStackTrace(), but return into a string instead of writing to a stream.
    */
   public String getStackTrace() {
      java.io.StringWriter w = new java.io.StringWriter();
      this.printStackTrace(new java.io.PrintWriter(w, true));
      return w.toString();
   }

This is useful because then error.vm can be:

<html>
<head>
</head>
<body bgcolor="white">
<h1><font color="red">Ack!</font></h1>

#if ($error.StackTrace)
<pre>
$error.StackTrace
</pre>
#else
<TT>$error</TT>
#end
</body>
</html>

this way, stack traces can be seen if the error variable is an exception object
that has a getStackTrace method.

Of course, that means overriding onException (unless Petr changes ActionServlet)
so that "error" is an exception object in the context, and not a string:

    protected Template onException(Context context,
                                   String form,
                                   String action,
                                   org.actionframework.ActionException e) {
       // return error(context, org.actionframework.util.Util.filterSpecialHTMLChars(e.toString()));
       context.put("error", e);
       return getTemplate("error.vm");
    }

There still seem to be a whole bunch of different exceptions that are not caught by
onException, which is a different problem....

-mda