Here the problem is that the attribute is removed from the underlying Collection in
line 6 ifthe session variable matches sessionVarName. This causes the
ConcurrentModificationException .
Enumeration e = session.getAttributeNames();
while (e.hasMoreElements())
{
String name = (String)e.nextElement();
if(name.equalsIgnoreCase(sessionVarName))
session.removeAttribute(name);
}
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