Hello!

Hibernate raises an AnnotationException when you try to bind a converter to a Lob:

@Entity
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @Convert(converter = MyConverter.class)
    @Lob
    private String status;

    @Converter
    public static class MyConverter implements AttributeConverter<String, Integer> {

        @Override
        public Integer convertToDatabaseColumn(String attribute) {
            return attribute.length();
        }

        @Override
        public String convertToEntityAttribute(Integer dbData) {
            return "";
        }
    }

// getters and setters...

}

-->

Caused by: org.hibernate.AnnotationException: AttributeConverter and explicit Type cannot be applied to same attribute [io.blep.MyEntity.status];remove @Type or specify @Convert(disableConversion = true)

After reviewing the JSR-338, I did not see any reason that avoids using converters with lobs. It says it is ok for basic attributes and not for Id, Version, relationships and Enumerated or Temporal.

Having a look to the source code, it seems that Lob attributes are considered as "explicit types" (https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/cfg/annotations/SimpleValueBinder.java#L206) which implies they are rejected later in https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/cfg/annotations/SimpleValueBinder.java#L425

The test case is in attachment.

Thanks!