title: UnsatisfiedDependencyException/circular reference error when starting Tomcat context
body: <p>I get the following error when starting Tomcat context:</p>
  <pre><code>Error starting Tomcat context. Exception: org.springframework.beans.factory.UnsatisfiedDependencyException. Message: Error creating bean with name 'securityConfig': Unsatisfied dependency expressed through field 'adminService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'adminServiceImpl': Unsatisfied dependency expressed through field 'userDetailsService'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'securityConfig': Requested bean is currently in creation: Is there an unresolvable circular reference?
  </code></pre>