torque/src/java/org/apache/fulcrum/security/torque/dynamic/TorqueDynamicModelManagerImpl.java [132:159]:
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			} finally {
				if (con != null) {
					Transaction.safeRollback(con);
				}
			}

			return;
		}

		if (!roleExists) {
			throw new UnknownEntityException("Unknown role '" + role.getName() + "'");
		}

		if (!permissionExists) {
			throw new UnknownEntityException("Unknown permission '" + permission.getName() + "'");
		}
	}

	/**
	 * Revokes a Permission from a Role.
	 *
	 * @param role       the Role.
	 * @param permission the Permission.
	 * @throws DataBackendException   if there was an error accessing the data
	 *                                backend.
	 * @throws UnknownEntityException if role or permission is not present.
	 */
	@Override
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torque/src/java/org/apache/fulcrum/security/torque/dynamic/TorqueDynamicModelManagerImpl.java [183:212]:
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			} finally {
				if (con != null) {
					Transaction.safeRollback(con);
				}
			}

			return;
		}

		if (!roleExists) {
			throw new UnknownEntityException("Unknown role '" + role.getName() + "'");
		}

		if (!permissionExists) {
			throw new UnknownEntityException("Unknown permission '" + permission.getName() + "'");
		}
	}

	/**
	 * Puts a user in a group.
	 *
	 * This method is used when adding a user to a group
	 *
	 * @param user  the User.
	 * @param group the Group
	 * @throws DataBackendException   if there was an error accessing the data
	 *                                backend.
	 * @throws UnknownEntityException if the account is not present.
	 */
	@Override
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