Dynamically add fields to an object using annotations (Java/Groovy) -

i'm trying use java annotations able add specific fields object.

the need following : have class processes configuration files keys associated values form key=value.

the problem want able let user defining himself required fields which, if not present, throws exception.

the easiest solution pass these fields constructor in string[] but, want user able use these required fields properties of class, he's able write in code :

@requiredfields(     field1,     field2,     field3) myclass myobject = new myclass(string filepath); string value = myobject.field1; 

and field field1 completion proposal ?

i'm developping in groovy, if not possible in standard java, in groovy ?

thanks !

what factory method validation? like:

myclass = myclassfactory.create("arg1", "arg2") 

or, maps on groovy:

def = myclassfactory.create arg1: "foo", arg2: "bar" 

and factory checks properties file.

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if want annotation, maybe type annotations on jdk 8 option.

on groovy, can try local ast, seems overengineered solution me, or gcontracts programming contract.

you combine factory gcontracts @ensure resulting object contains fields according properties file.