| Name | Type | Parent | Detail |
| HGException | Class | RuntimeException | Detail |
| HGRemoveRefusedException | Class | HGException | Detail |
| HGAtomRefusedException | Class | HGException | Detail |
| NoHyperGraphTypeException | Class | HGException | Detail |
| TransactionConflictException | Class | RuntimeException | Detail |
| HGUserAbortException | Class | RuntimeException | Detail |
| HGTransactionException | Class | Exception | Detail |
| MaintenanceException | Class | Exception | Detail |
| HGReplaceRefusedException | Class | HGException | Detail |
