| Exception | Description | 
|---|---|
| AlreadyInitializedException | 
 An  
AlreadyInitializedException may be thrown when an object has been created and another
 instance cannot conceivably be created again. | 
| MissingKeyException | 
 A  
MissingKeyException may be thrown when a method is invoked with a map argument which
 does not contain an expected or required key. | 
| MissingValueException | 
 A  
MissingValueException may be thrown when a method is invoked with a map argument which
 is missing a value for an expected key. |