Default the "Setter Method" field value to the Javabean setter method name translation of the associated bean property e.g. if the property is "name", the default value shown in this field should be "setName".

Only map this value to the config source if the user modifies it from the default. Mapping it otherwise would not break anything, but would be making the config more verbose than it needs to be.

I think showing this default value is a good idea for usability reasons i.e. the field could be left blank, as is is now. I think that the user being able to see the default value should give them a clearer idea of what it's about and if it needs to be modified based on their model.