asmhatre/java-interview-lab
1
0
Fork 0
Code Activity

Add hibernate-jpa module: 40 runnable Hibernate 7 / JPA interview answers on PostgreSQL 16

Browse Source 
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cfo2K4u4rF18QsPXPFnytf
This commit is contained in:
asmhatre
2026-10-24 17:33:29 +00:00
co-authored by Claude Sonnet 5.5
parent a5fbf45971
commit d03962ea9c
87 changed files with 2387 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
hibernate-jpa/output/q31-optimistic-locking.txt
+6
View File
@@ -0,0 +1,6 @@
both sessions read balance=100 version=0
session A commits +50 -> version is now 1
session B commits +25 -> jakarta.persistence.OptimisticLockException: Unexpected row count (expected row count 1 but was 0) [update Account set balance=?,owner=?,version=? where id=? and version=?] for entity [lab.hibernate.model.Account with id '1']
cause: org.hibernate.StaleObjectStateException: Unexpected row count (expected row count 1 but was 0) [update Account set balance=?,owner=?,version=? where id=? and version=?] for entity [lab.hibernate.model.Account with id '1']
SQL> update Account set balance=?,owner=?,version=? where id=? and version=?
final balance: 150 (B's stale write was rejected, A's +50 kept)