[Opensymphony-oscache] flushEntry method not working

The flushEntry method is not flushing. I am not sure if I am missing something. I am using the following code in my struts action class: 

ActionServlet actionServlet = getServlet(); 
ServletContext servletctx= actionServlet.getServletContext(); 
ServletCacheAdministrator admin = (ServletCacheAdministrator) servletctx.getAttribute("__oscache_admin"); 
Cache cache = admin.getAppScopeCache(servletctx); 
cache.flushEntry("mykey"); 

If I use flushAll() of ServletCacheAdministrator class, it is producing the expected results. 

Any help is appreciated. 

Thanks.

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http://forums.opensymphony.com/thread.jspa?threadID=2757&messageID=7552#7552