Concurrent Modification Exception in sessiontime out class

[shashi wagh]

Hi
I want to remove some attribute from the ServletContext when session time out
I am getting java.util.ConcurrentModificationException Exception for the following code

    
public class SessionTimeOutListener implements HttpSessionListener
{
 
public void sessionCreated( HttpSessionEvent httpSessionEvent ){}
public synchronized void sessionDestroyed( HttpSessionEvent httpSessionEvent ){

HttpSession httpSession = httpSessionEvent.getSession();
ServletContext context = httpSession.getServletContext();
 
UserProfileVO userProfileVO = (UserProfileVO)httpSession.getAttribute( CrmwConstant.USER_PROFILE );
 
Map< String, String > mapBookingLock = (Map< String, String> :wink: context
.getAttribute(CrmwConstant.BOOKING_LOCK_MAP );
 
if ( mapBookingLock != null )
{
Set setBooking = mapBookingLock.entrySet();
for ( Iterator iterator = setBooking.iterator();iterator.hasNext(); )
{
 Map.Entry pairs = (Map.Entry)iterator.next(); // Exception on this line
 
 String key = (String)pairs.getKey();
 String value = (String)pairs.getValue();
 
 if ( value.equals( ( CRMWUtility.getFullName( userProfileVO.getPrfx(), userProfileVO.getFirstName(),
userProfileVO.getMiddleName(), userProfileVO.getLastName() ) ) ) )
{
 mapBookingLock.remove( key );
}
 
}
context.setAttribute( CrmwConstant.BOOKING_LOCK_MAP, mapBookingLock );
 
}
 
}
 
}
 

[David Newton]

Shouldn't this be in the servlets forum?

It's also helpful to provide information like which specific line is throwing the exception and so on.

[Sagar Rohankar]

When I googled this exception , I found many links which discuss this particular problem..

This one might helps you in understand the problem..