The race condition a stress test found in my double-entry ledger — and how I fixed it
A developer encountered a race condition in their double-entry ledger system during stress testing. The issue arose when multiple transactions attempted to read and write the same account balance simultaneously, leading to incorrect balance updates. The developer implemented optimistic locking to resolve the issue and ensure accurate accounting.
- ▪The developer built a double-entry e-wallet ledger using Java, Spring Boot, and PostgreSQL.
- ▪A stress test revealed a race condition where concurrent transactions could lead to lost updates in account balances.
- ▪The solution involved using optimistic locking to prevent incorrect balance calculations during simultaneous transactions.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/xidoke/the-race-condition-a-stress-test-found-in-my-double-entry-ledger-and-how-i-fixed-it-b5o |
| Publication time | Sun, 24 May 2026 13:56:53 +0000 |
| Retrieval time | 2026-05-24T14:07:32.717Z |
| Last seen | 2026-05-24T14:07:32.717Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | sZ8j7YYvR4XP |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 1027650) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Do Pham Dinh Posted on May 24 • Originally published at github.com The race condition a stress test found in my double-entry ledger — and how I fixed it #java #springboot #postgres #concurrency I'm building ledger-service, a double-entry e-wallet ledger in Java 21 / Spring Boot 3.5 / PostgreSQL. It's live on Render. Early on I wrote a stress test that fires 50 transfers at the same account at once and asserts the books are never corrupted.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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