@MappedSuperclass
abstract class Base<TID, T> {
  TID id;
  T data;

  @Transient
  abstract getId();

  @Transient
  abstract getData;
}

@Entity()
@Table(...)
@Inheritance(strategy = SIMPLE_TABLE)
@SequenceGenerator(...)
@DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.INTEGER)
abstract class Value<T> extends Base<Long, T> {
 
  @Id()
  @GeneratedValue(...)
  ....

   public interface Type{
     int VARCHAR = 1;
     int NUMERIC = 2;
   }

   String propertyName;

   @ManyToOne
   @JoinColumn(name = "componentId")
   public Component getComponent() {
     return component;
   }

  @Entity()
  @DiscriminatorValue(Type.VARCHAR)
  public static class Varchar extends Value<String> {
       @Override
       @Column(name="dataString")
       String getData() {
           return data;
       }
  }

  @Entity()
  @DiscriminatorValue(Type.NUMERIC)
  public static class Numeric extends FValue<Long> {
    
   @Override
   @Column(name="dataLong")
   public Long getData() {
      return data;
   }
   }

}

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
class Component{
  protected Long id;
  private Map<String, FValue<?>> values = new HashMap<String, FValue<?>>();

@OneToMany(mappedBy = "component")
@MapKeyColumn(name = "propertyName")
public Map<String, FValue<?>> getValues() {
   return values;
}
}

select comp, v from Component comp inner join comp.values v where v.propertyName = 'exampleName' and v.data = 'example';

select comp, fv from Component as comp inner join comp.values as fv where comp.values['dpLongDesc'] in (select a.id from FValue$Numeric where a.data = :str)