question about error messages in service implementations

[Anders Hessellund-2]

Hi,

in the AgreementServices-class, there is a getCommissionForProduct(..)
method which implements a similarly named service. In lines 89-95 the code
handles an error

        // either ACCOUNTING_COMM_VIEW or ACCOUNTING_MANAGER should be

> allowed to see commission amounts
>         if (!security.hasEntityPermission("ACCOUNTING", "_COMM_VIEW",
> userLogin)) {
>             result.put(ModelService.RESPONSE_MESSAGE,
> ModelService.RESPOND_ERROR);
>             errMsg = UtilProperties.getMessage(ServiceUtil.resource, "
> serviceUtil.no_permission_to_operation", locale) + ".";
>             result.put(ModelService.ERROR_MESSAGE, errMsg);
>             return result;
>         }

instead of returning the requirede out-keys, it returns to error-related
keys (constants from the ModelService-class). Is there any written
documentation or tips on this kind of exit strategy for failed service
executions? I am interested in what the recommended use of such constant is.

-- Anders

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