public void setSet(boolean set) {
      this.set = set;
    }
Sometimes bean accessors don't have associated fields.
It is somewhat questionable wherever they should be included as attributes or not.
Right now the approach is conservative and getter / setter / field are all required.
Having a test to raise awareness about this usecase.
criteria/common/test/org/immutables/criteria/processor/JavaBeanModelTest.java