Autoincrement does not work PostgreSQL - Java EE APP

Question

I have application in which I have autoincrement for PK Id. I had to add other autoincremented column and I used liquibase to make it work - liquibase created sequence for auto increment. When I make insert from query tool or when i do not map this field in entity and make persist autoincrement works. But when I add :

@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "next_value", nullable=false, unique=true)
private Long nextValue;

I get an ugly error:

Caused by: org.postgresql.util.PSQLException: ERROR: empty value in the "next_value" column violates the limit of the required value

What is wrong here?

EDIT:

My liquibase changeset to add this column and make it autoincrement:

<addColumn tableName="table">
      <column name="next_value" type="number"/>
    </addColumn>
<addAutoIncrement
        columnDataType="number"
        columnName="next_value"
        incrementBy="1"
        startWith="1"
        tableName="table"/>
<sql>select setval('table_next_value_seq', (select cast(current_value+1 as bigint) from gapless_sequence), false)</sql>

setval was used to start it not from 1

Answer 1

i guess it should change table in db

ALTER TABLE tblName(
nextValue LONG NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),

....

Answer 2

You have to disable insertable and updatable false

@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "next_value", unique = true, nullable = false, insertable = false,updatable = false)