jHipster jakarta.validation.ConstraintViolationException during integration tests

I am trying to get the integration tests of my app running (the app itself seems to be working). The issue seems to be related to how the ID column of a table is defined (I suspect that auto_increment is ignored).

The test fails with the following stacktrace:

jakarta.validation.ConstraintViolationException: Validation failed for classes [org.app.domain.Category] during persist time for groups [jakarta.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='must not be null', propertyPath=id, rootBeanClass=class org.app.domain.Category, messageTemplate='{jakarta.validation.constraints.NotNull.message}'}
]
    at app//org.hibernate.boot.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:161)
    at app//org.hibernate.boot.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:84)
    at app//org.hibernate.action.internal.EntityIdentityInsertAction.preInsert(EntityIdentityInsertAction.java:201)
    at app//org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:79)
    at app//org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:682)
    at app//org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:293)
    at app//org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:274)
    at app//org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:324)
    at app//org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:393)
    at app//org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:307)
    at app//org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:223)
    at app//org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:136)
    at app//org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:177)
    at app//org.hibernate.event.internal.DefaultPersistEventListener.persist(DefaultPersistEventListener.java:95)
    at app//org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79)
    at app//org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55)
    at app//org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:127)
    at app//org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:761)
    at app//org.hibernate.internal.SessionImpl.persist(SessionImpl.java:745)
    at [email protected]/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at [email protected]/java.lang.reflect.Method.invoke(Method.java:580)
    at app//org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:320)
    at app/jdk.proxy3/jdk.proxy3.$Proxy278.persist(Unknown Source)
    at app//org.app.web.rest.CompetitionResourceIT.createEntity(CompetitionResourceIT.java:108)
    at app//org.app.web.rest.CompetitionResourceIT.initTest(CompetitionResourceIT.java:146)
    at [email protected]/java.lang.reflect.Method.invoke(Method.java:580)
    at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1596)
    at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1596)

The code causing it:

    Category category;
    if (TestUtil.findAll(em, Category.class).isEmpty()) {
      category = CategoryResourceIT.createEntity();
      em.persist(category);
      em.flush();
    } else {
      category = TestUtil.findAll(em, Category.class).get(0);
    }

This is how the table is defined in liquibase:

122     <createTable tableName="category">
123       <column autoIncrement="true" name="ID" type="INT">
124         <constraints nullable="false" primaryKey="true"/>
125       </column>
126       <column name="sex" type="VARCHAR(1)">
127         <constraints nullable="false"
128                      checkConstraint="CHECK (sex IN ('m', 'f'))"/>
129       </column>
130       <column name="nat" type="CHAR(3)">
131         <constraints nullable="false"/>
132       </column>
133       <column name="cat" type="VARCHAR(10)">
134          <constraints checkConstraint="CHECK (cat IN ('veterans', 'senior', 'junior', 'cadets')))"/>
135       </column>
136       <column name="arme" type="VARCHAR(10)">
137         <constraints nullable="false"
138                      checkConstraint="CHECK (arme IN ('foil', 'epee', 'sabre'))"/>
139       </column>
140       <column name="descr" type="VARCHAR(50)"/>
141       <column name="team" type="BOOLEAN"/>
142     </createTable>

And this is the Bean:

@Table(name = "category")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
@org.springframework.data.elasticsearch.annotations.Document(indexName = "category")
@SuppressWarnings("common-java:DuplicatedBlocks")
public class Category implements Serializable {

  private static final long serialVersionUID = 1L;

  @NotNull
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  @Column(name = "id", nullable = false)
  private Integer id;

  @NotNull
  @Column(name = "sex", nullable = false)
  @Convert(converter = SexConverter.class)
  @org.springframework.data.elasticsearch.annotations.Field(type = org.springframework.data.elasticsearch.annotations.FieldType.Keyword)
  private Sex sex;

If I have omitted important code / information, please let me know.