| Interface | Description | 
|---|---|
| XException.ERROR | Interface to define error codes. | 
| Class | Description | 
|---|---|
| RunnableCallable | Adapter class that allows  Runnables andCallables to
 be treated as the other. | 
| Exception | Description | 
|---|---|
| XException | Generic exception that requires error codes and uses the a message
 template from the error code. | 
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