title: FIlterChain exception Handling
body: <p>I am trying to understand Spring security which involves method security and URL based security . URL based security is completely based on <code>Servlet Filters</code>. There are some scenarios when Spring security deals with exception thrown by filters chain to do its work.</p>
  
  <p>I know how filters are executed by Servlet Container but  I am particularly interested in how <code>filterChain</code> handle exceptions thrown by <code>doFilter</code> method in filter chain.   </p>