after handcrafting the comparison in the beans we are delegating to

DelegationBean.groovy

package delegation

import groovy.transform.Sortable

class DelegationBean {
    @Delegate
    BeanOne person

    @Delegate
    BeanTwo dateOfBirth



    static void main(String... args) {
        DelegationBean one = new DelegationBean(person: new BeanOne("Liviu", "Tudor"), dateOfBirth: new BeanTwo(yob: 1975))
        DelegationBean two = new DelegationBean(person: new BeanOne("William", "Shakespeare"), dateOfBirth: new BeanTwo(yob: 1564))

        assert one instanceof Comparable
        println one.fullName
        println two.fullName
        println(one < two)
    }
}