To check duplications and other validations, have your class implementing Validatable interface like below:

import com.pmease.quickbuild.validation.Validatable;

@Editable
MyBean implements Validatable {

  private List<Property> properties;

  public List<Property> getProperties() {
    return properties;
  }

  public void setProperties(List<Property> properties) {
    this.properties = properties;
  }

  @Override
  public void validate(Set<String> properties, ErrorContext errorContext) {
    Set<String> keys = new HashSet<>();
    for (Property property: getProperties()) {
      if (!keys.add(property.getName()) {
        errorContext.setError("properties", "duplicate key found: " + property.getName());
      }
    }
  }
}