hibernate validation fails on postgres type / java enum

Overview

I try to use postgres custom enums with Hibernate running on WildFly10 (also tested with WildFly9 with same result). While searching I found the solution which was mentioned at several points, e.g.

• http://octagen.at/2014/10/postgresql-custom-data-types-enum-in-hibernate/
• Hibernate Enumeration Mapping
• java.lang.verifyError on hibernate specific usertype

So basically I added a custom UserType and added a @Type annotation pointing to the specific java type / converter. It works, I can use it in a JEE app and also in a JSE app without any problem.

Problem / Question

If I enable validation

<property name="hibernate.hbm2ddl.auto" value="validate"/> 

I get the following error

Schema-validation: wrong column type encountered
in column [gender] in table [test]; 
found [gender_type (Types#VARCHAR)], but expecting [uuid (Types#OTHER)]

Why expecting UUID when gender_type is correct?

Details

The PostgreSQL type:

CREATE TYPE gender_type as ENUM ('MALE','FEMALE');

The PostgreSQL table

create table test (
  name varchar(200) NOT NULL PRIMARY KEY,
  gender gender_type NOT NULL
);

The Java enum

public enum GenderEnum {

  MALE ("MALE"),
  FEMAIL ("FEMALE");

  private String value;

  private GenderEnum(String value) {
    this.value = value;
  }

  public String getValue() {
    return value;
  }        
}

The Java EnumType

public class GenderEnumType extends GenericEnumType<String, GenderEnum> {

  public GenderEnumType() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    super(GenderEnum.class, GenderEnum.values(), "getValue", Types.OTHER);
  }


  @Override
  public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner) throws HibernateException, SQLException {
    return nullSafeGet(rs, names, owner);
  }

  @Override
  public void nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session) throws HibernateException, SQLException {
      nullSafeSet(st, value, index);
    }        
  }

The GenericEnumType is basically the one from http://octagen.at/2014/10/postgresql-custom-data-types-enum-in-hibernate/.

Test entity: neither

@Basic(optional = false)            
@Enumerated (EnumType.STRING)
@Type (type = "full.path.to.GenderEnumType")
@Column(name = "gender")
private GenderEnum gender;

nor

@Basic(optional = false)               
@Type (type = "full.path.to.GenderEnumType")
@Column(name = "gender")
private GenderEnum gender;

works.