Production Bugs

Summary The PCF control build failed with error [pcf-1014] [Error] Manifest validation problem: instance requires property “manifest”. This issue arose due to incorrect configuration in the pcfconfig.json file, specifically the missing or misnamed “manifest” property under the control definition. Root Cause Misconfiguration in pcfconfig.json: The “manifest” property was either missing or incorrectly named under the … Read more

Summary Google Play flagged our React Native app for misuse of FOREGROUND_SERVICE permissions, despite functional push notifications. The app received notifications post-termination due to a foreground service, violating Play Store policies. Key issue: improper permission declaration and overuse of foreground services. Root Cause Unnecessary FOREGROUND_SERVICE_DATA_SYNC permission included in AndroidManifest.xml. Foreground service misuse: Used for push … Read more

Summary This postmortem explains why JavaScript treats object as a data type, and why the infamous typeof null === “object” behavior exists. These behaviors often confuse developers coming from class‑based languages like Java, but they stem from historical design decisions and how JavaScript represents values internally. Root Cause The root causes are twofold: JavaScript’s type … Read more

Summary An API was designed to return a list of stock names based on a provided sector name. However, it failed to handle edge cases, such as invalid sector names or sectors with no associated stocks, leading to unexpected 500 Internal Server Errors. Root Cause Lack of input validation: The API did not validate sector … Read more

Summary Deploying a Vite + React app on Plesk resulted in a 404 error on route refresh due to missing history fallback configuration. The issue arose from treating the app as static files without proper client-side routing support. Root Cause Missing History Fallback: React Router’s client-side routing requires a fallback to index.html for non-root routes, … Read more

Summary A long‑running Dagster deployment using DockerRunLauncher began failing with ConnectionRefusedError when attempting to talk to the host Docker daemon through /var/run/docker.sock. The host daemon had been restarted, but the Dagster container continued using a stale bind‑mounted socket inode, causing all Docker API calls to fail until the container itself was restarted. Root Cause The … Read more

Summary In a recent simulation of a distribution center using AnyLogic, a critical issue arose where trucks were only assigned to a single dock, causing inefficiencies in pallet handling. The root cause was the lack of dynamic dock assignment logic, leading to underutilized resources and delayed shipments. Root Cause Fixed Dock Assignment: Trucks were hardcoded … Read more

Summary Making the Logger::Write method const in C++ is debatable but depends on whether the method modifies object state. If it only writes to an external resource (e.g., terminal) without changing internal state, marking it const is correct. However, if it updates internal counters (e.g., message_count), it must use mutable for those fields or avoid … Read more