신동훈 ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=63fc1ff... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZTkzNzI3OTBm... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16862?atlOrigin=eyJpIjoiZTkzNz... ) HHH-16862 ( https://hibernate.atlassian.net/browse/HHH-16862?atlOrigin=eyJpIjoiZTkzNz... ) Bad logs that occur when query collections when batchsize is applied ( https://hibernate.atlassian.net/browse/HHH-16862?atlOrigin=eyJpIjoiZTkzNz... ) Change By: 신동훈 ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=63fc1ff... ) The remaining elements of the array are returned as null when querying the collection after applying the batch size. For example, if the batch size is 100 and only 1 id is entered, 99 nulls are bound.Below is the example code {code:java}@Entity public class Member { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") private Long id; @ManyToOne @JoinColumn(name = "team_id") private Team team; protected Member() { } public void setTeam(Team team) { this.team = team; } } {code} {code:java}@Entity public class Team { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id") private Long id; @OneToMany(mappedBy = "team") private List<Member> members = new ArrayList<>(); public List<Member> members() { return members; } } {code} {code:java}@Transactional @SpringBootTest class MemberTest { @Autowired private EntityManager em; @Test void error() { Team team = new Team(); em.persist(team); em.flush(); Member member = new Member(); member.setTeam(team); em.persist(member); em.flush(); em.clear(); Team team1 = em.find(Team.class, 1L); System.out.println(team1.members().size()); } } {code} h3. application.yml {code:yaml} logging: level: root: info org.hiberante.SQL: debug org.hibernate.orm.jdbc.bind: trace org.apache.coyote.http11: debug #Http ???? ?? ??? spring: datasource: driver-class-name: org.h2.Driver url: jdbc:h2:mem:testdb username: sa password: h2: console: enabled: true path: /h2-console jpa: show-sql: true open-in-view: false database-platform: org.hibernate.dialect.H2Dialect properties: hibernate: format_sql: true use_sql_comments: true highlight_sql: true default_batch_fetch_size: 100 hibernate: ddl-auto: create {code} and below is error log image. !스크린샷 2023-06-28 오후 7.00.04.png|width=1388,height=979! This is likely because the CollectionBatchLoaderArrayParam class, the return value of the StandardBatchLoaderFactory.createCollectionBatchLoader() method, is assigned to a reusablecollectionLoader inside the AbstractCollectionPersister.createCollectionLoader() method and then reused. In order to use the CollectionBatchLoaderArrayParam in any case inside StandardBatchLoaderFactory.createCollectionBatchLoader(), it seems that we need to do something about the logs. ( https://hibernate.atlassian.net/browse/HHH-16862#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16862#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100227- sha1:534ec1c )