Join table of lazy loading many-to-many relation not saved when lazy initialization bytecode enhancement is active

Description

Adding items to a lazy loading many-to-many Set (and saving the entity) doesn't trigger the appropriate INSERT SQL query, so the new relations are not saved, when the parent entity has an @ElementCollection field too.

A self-contained demo is available in

, it's runnable with mvn clean test.

I've experienced this issue both with Hibernate ORM 5.1.0 and 5.2.0; but 5.0.9 seems to be working fine.

I've found that any of the following changes make it work again (see the demo app):

Uncomment the parent.getNames(); command at Main.java:75.
Remove the names field, and the getNames() and setNames(Set<String>) methods of the Parent entity.
Change the fetch attribute of the @ManyToMany annotation to FetchType.EAGER.
Set enableLazyInitialization to false in pom.xml.
Change Hibernate's version to 5.0.9 in pom.xml (there are two instances).

Performing any of these changes makes the insert into parents_children (parent, child) values (?, ?) SQL command appear in the standard output.

Attachments

Linked issues

caused by

HHH-10551

NonIdentifierAttribute.isLazy() returns false when @Basic(fetch=FetchType.LAZY)

is duplicated by

HHH-10866

Lazy properties are not updated if not all lazy properties are initialized

Activity

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Former user June 30, 2016 at 2:42 AM

Fixed in master, 5.1, and 5.0 branches.

Luis Barreiro June 29, 2016 at 6:27 AM

I was finally able to use the sample you provided to create a proper test case that reproduces the issue. With the test case and with the awesome analysis you did, I came up with a fix not much different than what you suggested. PR: https://github.com/hibernate/hibernate-orm/pull/1461

Gábor Varga June 28, 2016 at 1:35 PM

, I have changed my demo project to use the 5.2.1-SNAPSHOT versions by applying

At the time of writing, the snapshot versions were hibernate-core-5.2.1-20160628.131959-62 and hibernate-enhance-maven-plugin-5.2.1-20160628.132014-61.

Unfortunately, the issue is still present: mvn clean test still prints

Hibernate: delete from parents_children where parent=?

and

java.lang.RuntimeException: Child count is 0. Child hasn't been added to parent?!

Luis Barreiro June 28, 2016 at 12:54 PM

Hibernate does have a Maven repository with the latest sources at http://snapshots.jboss.org/maven2/. For latest hibernate-core see http://snapshots.jboss.org/maven2/org/hibernate/hibernate-core/5.2.1-SNAPSHOT/

Gábor Varga June 28, 2016 at 8:07 AM

The Fix Versions of include 5.2.0. This issue, however, does affect 5.2.0.
Is there a Maven repository available with builds from the latest sources that you've mentioned, by any chance?