Are there any struts generated error messages?

When I make an error in my struts logic, the HTML page generation stops at that point and I see truncated HTML pages. However, I cannot find an error message anywhere. For example, I recently didn't define a setter/getter in an ActionForm for an html:hidden field I added to a JSP page, and so struts failed to complete generating the web page.
Is there anyway to get error messages from the struts code on why it fails?
I'm asking because right now I am having to back out changes until I find the offending piece of code which is a slow process, and so I'm looking for a more productive way to find my struts errors.

When I make an error in my struts logic, the HTML page generation stops at
that point and I see truncated HTML pages.This is because the page has already been committed, and Tomcat can't redirect to the standard error page.
There will probably be an error message in the log / console. Check the [TOMCAT]/logs directory.
On stopping it: There are two causes
1 - your generated html overflows the buffer and it flushes (commits). Workaround solution - make the buffer bigger for debugging purposes: <%@ page buffer="32kb" %>
2 - you are using tiles, and it flushes after each tile. No workaround I am aware of, but I don't really use tiles much.

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