public class IdAlreadyInUseException
extends java.lang.RuntimeException
This exception can be raised when a class instance should be unique in one context, but was instantiated several times. This can be used in a "singleton" pattern, but also in set classes (containers) when the same element has been inserted multiple times but should not.
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IdAlreadyInUseException()
Throws the message "singleton exception". 
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IdAlreadyInUseException(java.lang.String message)
Throws a given message. 
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