Ofbiz: java and mini lang custom messages

ofbiz-custom-message.java

result = ServiceUtil.returnError( message );
result = ServiceUtil.returnError( messageList );
result = ServiceUtil.returnSuccess( message );
result = ServiceUtil.returnSuccess( messageList );

ofbiz-custom-message.xml

<add-error>
    <fail-property resource="WorkEffortUiLabels" property="WorkEffortTimesheetAlreadyExists"/>
</add-error>
<check-errors/>

<add-error error-list-name="errorMessageList">
    <fail-message message="this is a message"/>
</add-error>
<return response-code="error"/>

<string-to-list list="errorMessageList" string="${closurePaymentsProcessedEmpty}"/>
<string-to-list list="successMessageList" string="${detectedPayments} ${closurePaymentsStat}"/>