tiles tags exception handling

[Nathan Coast]

Hi,

I've been having trouble getting exceptions handled usefully when they 
occur within jsps called via tiles:insert tags.

I've tracked the code down to:

org.apache.struts.taglib.tiles.InsertTag

where this exception handling code is called:

protected void processException(Throwable ex, String msg) throws 
JspException {
  try {
    if (msg == null)
      msg = ex.getMessage();
    if (log.isDebugEnabled()) { // show full trace
      log.debug(msg, ex);
      pageContext.getOut().println(msg);
      ex.printStackTrace(new PrintWriter(pageContext.getOut(), true));
    } else { // show only message
      pageContext.getOut().println(msg);
    } // end if
  } catch (IOException ioex) { // problems. Propagate original exception
    pageContext.setAttribute(
      ComponentConstants.EXCEPTION_KEY,
      ex,
      PageContext.REQUEST_SCOPE);
    throw new JspException(msg);
  }
}

my understanding of this code is that no exception will be passed to the 
enclosing jsp page.  If an excption occurs, a simple error message will 
appear in the enclosing page.  If debug is enabled for the Logger 
"org.apache.struts.taglib.tiles.InsertTag" then the stack is filled in 
too.  Am I right?

If so, would it be better to enable excptions to be cascaded up, 
enabling exception management in a more application specific manner? 
e.g. making use of the error-page elements in the web.xml

I'd like to be able to log the error centrally and display to the user a 
meaningful error page.

thanks
Nathan
p.s.  thanks to all the development team.  Struts seriously reduces 
devlopment time and increases the quality of applications built with it.

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