Cause of Death: Hibernate
summary
Shows concrete bugs and fixes: using fetch type eager causes an N+1 of one query per author, while one left join fetch eliminates it; modeling many-to-many with List triggers full-delete-and-reinsert, switching to Set issues a single delete; bidirectional links require updating both sides or deletes never run; enabling cascade remove on many-to-many deletes related books and authors across the graph; includes a small perf tester tool that collects runtime JDBC stats to find these problems during tests.
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