Liquibase ignores autoIncrement="true" for Oracle DB - oracle

Question

I generated a schema/tables via the DDL that Hibernate generated which was correct:
create table cat_component.organisation (
id number(19,0) generated as identity,
archived number(1,0),
is_in_avaloq_group number(1,0) not null,
mdm_uuid varchar2(255 char),
name varchar2(255 char),
primary key (id)
)
After that, I tried to generate Liquibase changelog which looks like this:
<changeSet author="blabla (generated)" id="1582733383680-5">
<createTable tableName="organisation">
<column autoIncrement="true" name="id" type="NUMBER(19, 0)">
<constraints primaryKey="true" primaryKeyName="organisationPK"/>
</column>
<column name="archived" type="NUMBER(1, 0)"/>
<column name="is_in_avaloq_group" type="NUMBER(1, 0)">
<constraints nullable="false"/>
</column>
<column name="mdm_uuid" type="VARCHAR2(255 CHAR)"/>
<column name="name" type="VARCHAR2(255 CHAR)"/>
</createTable>
</changeSet>
The problem is that if I try to run the liquibase changelog, it translates the XML definition into this:
2020-02-26 16:15:10.779 INFO 8064 --- [main] liquibase.executor.jvm.JdbcExecutor : CREATE TABLE CAT_COMPONENT.organisation (id NUMBER(19, 0) NOT NULL, archived NUMBER(1, 0), is_in_avaloq_group NUMBER(1, 0) NOT NULL, mdm_uuid VARCHAR2(255 CHAR), name VARCHAR2(255 CHAR), CONSTRAINT organisationPK PRIMARY KEY (id))
2020-02-26 16:15:10.787 INFO 8064 --- [main] liquibase.changelog.ChangeSet : Table organisation created
2020-02-26 16:15:10.787 INFO 8064 --- [main] liquibase.changelog.ChangeSet : ChangeSet classpath:/db/changelog/db.changelog-master.xml::1582733383680-5::blabla (generated) ran successfully in 9ms
As you may have noticed, "generated as identity" is missing, which
makes me believe that for whatever reason, the autoIncrement="true"
is ignored.
I use Oracle 12.1.0.2 and org.liquibase:liquibase-core 3.8.2.
The OJDBC driver is version 19.3.0.0.
The gradle properties are:
spring.datasource.url=jdbc:oracle:thin:#//host:1522/SID
spring.datasource.driverClassName=oracle.jdbc.OracleDriver
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver
spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.format_sql=true
spring.datasource.username=user
spring.datasource.password=pass
spring.jpa.database-platform=org.hibernate.dialect.Oracle12cDialect
spring.jpa.show-sql=true
logging.level.org.hibernate.SQL=debug
logging.level.org.hibernate.type=trace
spring.datasource.continue-on-error=true
spring.datasource.platform=oracle
spring.liquibase.url=${spring.datasource.url}
spring.liquibase.user=${spring.datasource.username}
spring.liquibase.password=${spring.datasource.password}
spring.liquibase.url=${spring.datasource.url}
spring.liquibase.user=${spring.datasource.username}
spring.liquibase.password=${spring.datasource.password}
spring.liquibase.change-log=classpath:/db/changelog/db.changelog-master.xml
spring.liquibase.default-schema=${spring.jpa.properties.hibernate.default_schema}
spring.liquibase.liquibase-schema=${spring.jpa.properties.hibernate.default_schema}
I've read the Internet, and I know that my Oracle version is compatible with this column type and I don't need to create extra oracle Sequences.
Any clue what could be the problem?

Answer 1

It seems to be a bug in Liquibase. I just found it here https://liquibase.jira.com/projects/CORE/issues/CORE-3524?filter=allissues&orderby=updated%20DESC&keyword=Oracle
As it states, there is a work-around to add the
generationType="BY DEFAULT"
at each column definition, where autoIncrement="true" has been used.

Answer 2

Correct the autoIncrement="true" is ignored due to the missing support on Oracle side for auto incremented columns as seen in the docs from liquienter link description here:
Is column an auto-increment column. Ignored on databases that do not
support autoincrement/identity functionality.
You will need to create a sequence for generating the IDs and providing the sequence to the id column when inserting the data i.e. with hibernate:
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "XXX_ID_GEN")
#SequenceGenerator(name = "XXX_ID_GEN", sequenceName = "SEQ_XXX")
long id;