[hibernate-issues] [JIRA] (HHH-17064) Fetch mode select causes StackOverflowError

Ruslan Gryn ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNGVjNjcyZjMz... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-17064?atlOrigin=eyJpIjoiNGVjNj... ) HHH-17064 ( https://hibernate.atlassian.net/browse/HHH-17064?atlOrigin=eyJpIjoiNGVjNj... ) Fetch mode select causes StackOverflowError ( https://hibernate.atlassian.net/browse/HHH-17064?atlOrigin=eyJpIjoiNGVjNj... ) Issue Type: Bug Affects Versions: 6.2.7 Assignee: Unassigned Attachments: orm.zip Components: hibernate-core Created: 09/Aug/2023 13:15 PM Environment: PostgreSQL h2 Priority: Major Reporter: Ruslan Gryn ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) I discovered this issue during migration to Spring Boot 3 and Hibernate 6.2 So if we have the following entity @Entity public class Main { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @ManyToOne private Connector connector; @ManyToOne(fetch = FetchType.LAZY) private Sub sub; } This entity has a reference to Sub entity which is lazy Connector entity has a reference on Sub as well and FetchMode is a SELECT @Entity public class Connector { @Id private Long id; @ManyToOne @Fetch(FetchMode.SELECT) private Sub sub; } when executing the following query select m from Main m where m.connector.id = 1 you will get the following exception ava.lang.StackOverflowError at org.hibernate.sql.results.graph.entity.EntityInitializer.findFirstEntityInitializer(EntityInitializer.java:34) at org.hibernate.sql.results.graph.entity.internal.EntitySelectFetchInitializerBuilder.createInitializer(EntitySelectFetchInitializerBuilder.java:45) at org.hibernate.sql.results.graph.entity.internal.EntityFetchSelectImpl.buildEntitySelectFetchInitializer(EntityFetchSelectImpl.java:92) at org.hibernate.sql.results.graph.entity.internal.EntityFetchSelectImpl.lambda$createAssembler$0(EntityFetchSelectImpl.java:70) at org.hibernate.sql.results.internal.ResultsHelper$1.resolveInitializer(ResultsHelper.java:117) at org.hibernate.sql.results.graph.entity.internal.EntityFetchSelectImpl.createAssembler(EntityFetchSelectImpl.java:67) at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.<init>(AbstractEntityInitializer.java:172) at org.hibernate.sql.results.graph.entity.internal.EntityJoinedFetchInitializer.<init>(EntityJoinedFetchInitializer.java:48) at org.hibernate.sql.results.graph.entity.internal.EntityFetchJoinedImpl.buildEntityJoinedFetchInitializer(EntityFetchJoinedImpl.java:127) at org.hibernate.sql.results.graph.entity.internal.EntityFetchJoinedImpl.lambda$getEntityInitializer$0(EntityFetchJoinedImpl.java:100) at org.hibernate.sql.results.internal.ResultsHelper$1.resolveInitializer(ResultsHelper.java:117) at org.hibernate.sql.results.graph.entity.internal.EntityFetchJoinedImpl.getEntityInitializer(EntityFetchJoinedImpl.java:97) at org.hibernate.sql.results.graph.entity.AbstractNonLazyEntityFetch.createAssembler(AbstractNonLazyEntityFetch.java:68) at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.<init>(AbstractEntityInitializer.java:172) at org.hibernate.sql.results.graph.entity.internal.EntityResultInitializer.<init>(EntityResultInitializer.java:35) at org.hibernate.sql.results.graph.entity.internal.EntityResultImpl.lambda$createResultAssembler$0(EntityResultImpl.java:91) at org.hibernate.sql.results.internal.ResultsHelper$1.resolveInitializer(ResultsHelper.java:117) at org.hibernate.sql.results.graph.entity.internal.EntityResultImpl.createResultAssembler(EntityResultImpl.java:82) at org.hibernate.sql.results.jdbc.internal.StandardJdbcValuesMapping.resolveAssemblers(StandardJdbcValuesMapping.java:53) I’ve attached the reproducer. Run ORMStandaloneTestCase class to reproduce this issue Also, it works fine on Hibernate 5 ( https://hibernate.atlassian.net/browse/HHH-17064#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-17064#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#100234- sha1:90f5128 )