torque/src/java/org/apache/fulcrum/security/torque/dynamic/TorqueDynamicModelManagerImpl.java [233:262]:
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			} finally {
				if (con != null) {
					Transaction.safeRollback(con);
				}
			}

			return;
		}

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

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

	/**
	 * Removes a user in a group.
	 *
	 * This method is used when removing 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 user or group is not present.
	 */
	@Override
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torque/src/java/org/apache/fulcrum/security/torque/dynamic/TorqueDynamicModelManagerImpl.java [283:310]:
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			} finally {
				if (con != null) {
					Transaction.safeRollback(con);
				}
			}

			return;
		}

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

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

	/**
	 * Grants a Group a Role
	 *
	 * @param group the Group.
	 * @param role  the Role.
	 * @throws DataBackendException   if there was an error accessing the data
	 *                                backend.
	 * @throws UnknownEntityException if group or role is not present.
	 */
	@Override
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