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Concurrent Modification Exception in sessiontime out class

 
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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

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

This one might helps you in understand the problem..
 
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