Re: Better handling of template exceptions in web applications.

Correction:  The handleServletException issue has resolved itself.  I think
I must have been not getting the updated classes published to the web server
as they were being changed.  The issue of how best to change the
HTTPServletResponse writer so that it buffers still stands.

Apologies

Geoff S

On 29 July 2011 11:24, Geoff Shuetrim <[email protected]> wrote:

> I am using Apache Tomcat 6 with Stripes 1.5.6 and Freemarker 2.3.18.  I
> have been trying to follow FAQ guidance 24 on tidy handling of template
> exceptions.
>
> First up, I have tried to change the Freemarker configuration by
> subclassing the FreemarkerServlet and including:
>
>     @Override
>     protected Configuration createConfiguration() {
>         Configuration cfg = super.createConfiguration();
>
> cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
>         return cfg;
>     }
>
> I have also included:
>
>     private void handleServletException(ServletException se,
> HttpServletResponse response) throws IOException {
>         if (response.isCommitted()) {
>             Writer writer = response.getWriter();
>             writer.append("<!-- FREEMARKER ERROR MESSAGE STARTS HERE -->"
>                + "<script language=javascript>//\"></script>"
>                + "<script language=javascript>//\'></script>"
>                + "<script language=javascript>//\"></script>"
>                + "<script language=javascript>//\'></script>"
>                + "</title></xmp></script></noscript></style></object>"
>                + "</head></pre></table>"
>                + "</form></table></table></table></a></u></i></b>"
>                + "<div align=left "
>                + "style='background-color:white; color:black; "
>                + "display:block; border-top:double; padding:2pt; "
>                + "font-size:medium; font-family:Arial,sans-serif; "
>                + "font-style: normal; font-variant: normal; "
>                + "font-weight: normal; text-decoration: none; "
>                + "text-transform: none'>"
>                + "<b style='font-size:medium'>FreeMarker template
> error!!!</b>"
>                + "<pre><xmp>");
>                 writer.append("</xmp></pre></div></html>");
>                 writer.flush();
>         } else {
>             logger.info("Response is NOT committed so sending user to a
> nice error page.");
>             response.reset();
>             response.sendRedirect((new
> CustomActionResolver()).getUrlBinding(ErrorActionBean.class));
>         }
>     }
>
> When a template exception occurs, after making those changes, the response
> has been committed.  The content I specify to be written to the response
> does get written but it is at the end of a yellow stack trace, which is what
> I have been trying to hide from users.
>
> Even if I can get that to work, my preference would be to use full page
> buffering but it is not at all clear to me how I should provide the Writerinstance for the
> Template.process(*...*) method when working in a servlet context.  The
> writer being used by the HTTPServletResponse is accessible from the the
> HTTPServletResponse but there is no setter for the writer in the response.
>
> Thoughts on how to solve the problem either way are appreciated.
>
> Regards
>
> Geoff Shuetrim
>
>
>

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