Returns the object for the specified <code>key</code> that is bound to
the current thread.
@param key the key that identifies the value to return
@return the object keyed by <code>key</code> or <code>null</code> if
no value exists for the specified <code>key</code>
Returns the object for the specified <code>key</code> that is bound to the current thread.
@param key the key that identifies the value to return @return the object keyed by <code>key</code> or <code>null</code> if no value exists for the specified <code>key</code>