http://ofbiz.116.s1.nabble.com/Users-sendMailToRoles-tp138731p138741.html
Which version of OFBiz are you using? If I remember right this was a problem a long time ago but is no longer.
> Charles,
>
>> I'll check the IN/OUT parameters - not really 100% sure how that works anyway.
>
> A quick summary...
>
> OFBiz services take and return a Map of values, input values are
> validated before the service is run and output values are validated
> after the service runs.
>
> The services.xml (called this by convention - not imperative) file is
> used to define the input and output parameters as well as their type, so
> the definition of a parameter looks something like this...
>
> <attribute name="myvalue" type="String" mode="IN" optional="true"/>
>
> "myvalue" is the name you assign to your parameter.
> e.g. when compiling the input map you might do something like
> inputMap.put("myvalue",new String("This is my input value"));
>
> "type" is the java type, any java type is allowed here (e.g.
> java.util.List )
>
> "mode" can be either...
> IN input parameter only
> OUT output parameter only
> INOUT used as both an input and output parameter
>
> "optional" if set to false then service validation will fail if the
> parameter is missing.
>
> I hope that helps.