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This class intercepts the org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping, configured
 in pages-servlet.
 
 The purpose of this class is to clear the state information persisted for various flows.
 1.  Clears the Study/Subject/Course details (captured for manage/report adverse event flow)
     when the user moves out of AE flow. 
 2. Need to maintain the section (second level nav) highlighting , when the user is on Submit flow.
    (so some properties for that will be set here).
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