title: Foreseeing issues when upgrading from Spring 4.2 to Spring 5.0.5
body: <p>On my current project we are using Spring 4.2 (core, aop, beans, web , webmvc, etc).</p>
  
  <p>What are the major problems we could encounter when upgrading from Spring 4.2 to Spring 5.0.5? How backward compatible would Spring Security 4.2 be with Spring 5.0.5?</p>
  
  <p>Thank you for your time.</p>