We are trying to upgrade hibernate from version 4.3.5 to 5.4.0. With this the jpa version also changes from hibernate-jpa-2.1 to jpa-2.2. After the upgrade we get the following error when using the List<> collection with @OrderColumn
"javax.persistence.PersistenceException: org.hibernate.HibernateException: null index column for collection"
I have forked the hibernate-test-case-templates repo and added a test case for both hibernate 4 and hibernate 5 projects. The test case passes as expected in hibernate 4 while it fails in hibernate 5.
The workaround to use a Set mapping with an OrderBy clause works but we would like to understand the root cause of the error. There are more than 100 such one-to-mappings in our project that are affected due to this failure.
Kindly note that the test case could be found here - https://github.com/shahamit/hibernate-test-case-templates/tree/master/orm
Please refer to the JPAUnitTestCase.readObjectWithList() test case. It is created for both the projects - test-case-template-hibernate-orm4 & test-case-template-hibernate-orm5. The test case passes for the former project while fails for the latter one.
Reproduced with hibernate test template using Hibernate 5.4.0