asked on

Please solve my error in ehcache

Aug 24, 2012 11:02:03 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: net.sf.ehcache.Element cannot be cast to javax.servlet.http.HttpSession
      at com.sm.GlobalCacheDataStore2.getChildSessionObj(GlobalCacheDataStore2.java:84)
      at org.apache.jsp.moreCourseInfo2_jsp._jspService(moreCourseInfo2_jsp.java:105)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
      at java.lang.Thread.run(Thread.java:662)

this is my code

       public static HttpSession getChildSessionObj(String sessID)
       {
             widgetCache = cacheManager.getEhcache( "widgets" );
             Element element = widgetCache.get( sessID );
       if( element != null )
       {

       // Get the value out of the element and cast it to a Widget
       return (HttpSession) element.getValue();
       }
       return null;
       }

i am calling here

HttpSession curSess;
       if(curSessId!=null)
       {
              GlobalCacheDataStore2.setChildSessionIdForParentSessionId(parentSessionId, curSessId);
              curSess = GlobalCacheDataStore2.getChildSessionObj(curSessId);
              curSess.setMaxInactiveInterval(val);

that time it provides class cast exception for httpsession in ehcache

please help me

CEHJ

  // Get the value out of the element and cast it to a Widget
                  return (HttpSession) element.getValue();

Open in new window

... but you're not doing that. You're casting it to an HttpSession. Why?

Manikandan Thiagarajan

ASKER

that is example program so it contains that statement.

my program only returns httpsession at that time it would provide class cast exception

CEHJ

Sorry - i don't understand that. A ClassCastException is pretty simple really - you're trying to cast the object to a type that is foreign to it, so it will fail.

ASKER CERTIFIED SOLUTION

cmalakar

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CEHJ