Hibernate Delete Error: Batch Update Returned Unexpected Row Count

Question

I wrote this method below that is suppose to delete a member record from the database. But when I use it in my servlet it returns an error.

MemberDao Class

Answer 1

In my case this exception was caused by wrong entity mapping. There were no cascade for relation, and referenced child entity wasn't saved before trying to reference it from parent. Changing it to

    @OneToMany(cascade = CascadeType.ALL)

fixed the issue.

Surely best way to find cause of this exception is setting show_sql and DEBUG level for logs - it will stop just at the sql that caused the problem.