Fix: Jest Snapshot Outdated — 1 snapshot obsolete
How to fix Jest snapshot failures — updating outdated snapshots, removing obsolete ones, fixing inline snapshots, preventing brittle snapshot tests, and managing snapshots in CI.
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693 articles — Page 31 of 58
Fix: Linux OOM Killer Killing Processes (Out of Memory)
How to fix Linux OOM killer terminating processes — reading oom_kill logs, adjusting oom_score_adj, adding swap, tuning vm.overcommit, and preventing memory leaks.
Fix: Next.js CORS Error on API Routes
How to fix CORS errors in Next.js API routes — adding Access-Control headers, handling preflight OPTIONS requests, configuring next.config.js headers, and avoiding common proxy mistakes.
Fix: pandas merge() Key Error and Duplicate Columns (_x, _y)
How to fix pandas merge and join errors — KeyError on merge key, duplicate _x/_y columns, unexpected row counts, suffixes, and how to validate merge results.
Fix: PostgreSQL "sorry, too many clients already"
How to fix PostgreSQL 'sorry, too many clients already' error — checking active connections, using connection pooling with PgBouncer, tuning max_connections, fixing ORM pool settings, and finding connection leaks.
Fix: Prisma Unique Constraint Failed on the Fields
How to fix Prisma's 'Unique constraint failed on the fields' error — finding which field caused it, handling upserts, race conditions, and bulk insert deduplication.
Fix: Pydantic ValidationError — Field Required / Value Not Valid
How to fix Pydantic ValidationError in Python — missing required fields, wrong types, custom validators, handling optional fields, v1 vs v2 API differences, and debugging complex nested models.
Fix: React useEffect Runs Twice in Development
Why React useEffect runs twice in development with Strict Mode, how to handle the double invocation correctly, when to add cleanup functions, and when the double-run actually reveals a real bug.
Fix: Spring Boot Failed to Configure a DataSource
How to fix 'Failed to configure a DataSource: url attribute is not specified' in Spring Boot — adding database properties, excluding DataSource auto-configuration, H2 vs production DB setup, and multi-datasource configuration.
Fix: TypeScript Decorators Not Working (experimentalDecorators)
How to fix TypeScript decorators not applying — experimentalDecorators not enabled, emitDecoratorMetadata missing, reflect-metadata not imported, and decorator ordering issues.
Fix: TypeScript Enum Not Working — const enum, isolatedModules, and Runtime Issues
How to fix TypeScript enum problems — const enum with isolatedModules, enums not available at runtime, string vs numeric enums, and migrating to union types or as const objects.
Fix: Vite Environment Variables Not Working
How to fix Vite environment variables showing as undefined — missing VITE_ prefix, wrong .env file for the mode, import.meta.env vs process.env, TypeScript types, and SSR differences.