siva-sai-udaygiri opened a new pull request, #5135:
URL: https://github.com/apache/fineract/pull/5135
## JIRA
FINERACT-1086
## What
Acquire a DB write lock on `Loan` to serialize concurrent writers and avoid
`JpaOptimisticLockingFailureException`.
## How
- In `LoanAccountDomainServiceJpa#makeRefund(...)`, immediately after
assembling the loan, call:
`entityManager.lock(loan, LockModeType.PESSIMISTIC_WRITE);`
- Leave existing `loanRepositoryWrapper.saveAndFlush(loan)` unchanged.
## Why
Optimistic locking was tripping when two requests updated the same Loan at
once. A `PESSIMISTIC_WRITE` lock ensures only one writer proceeds at a time.
## Notes
- Local Windows build hit Spotless/line-ending issues. I will run `./gradlew
spotlessApply` in Linux (WSL/Codespaces) and push formatting updates shortly.
- Follow-up plan: add an integration test that performs two concurrent
updates on the same Loan and asserts no optimistic-locking failure.
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