Unity Material coming up as null from UIToolkit, and it won’t set custom attributes

Summary A developer is attempting to animate a custom shader parameter (_RevealAmount) on a VisualElement in Unity’s UI Toolkit. The unityMaterial property appears as null at runtime, and setting attributes on it fails to update the screen. The root cause is that UI Toolkit materials are immutable copies used for inline styles. Attempting to mutate … Read more

Configuring connection pool setting – maxRequestsPerHost in openai-ai java

Summary A production Java service using the openai-java SDK experienced intermittent timeout errors and elevated latency when calling OpenAI APIs under load. The root cause was an unconfigured OkHttp connection pool, specifically the maxRequestsPerHost limit. The default OkHttp client settings (5 requests per host) bottlenecked concurrent API calls, causing requests to queue and eventually time … Read more

Build compiler-rt for llvm riscv

Summary During a cross-compile of compiler-rt for RISC-V, assembly files failed due to missing -march=rv64gc in compiler flags. The CMake configuration explicitly set CMAKE_C_FLAGS and CMAKE_CXX Desarrollo_FLAGS but didn’t propagate to .S assembly files, causing FPU instruction failures. Root Cause CMake’s language-specific flag handling: CMAKE_C_FLAGS/CMAKE_CXX_FLAGS apply to C/C++ sources only, not assembly (.S files). Assembly … Read more

Sometimes LiveKit SwiftUI SDK not showing partner’s video

## Summary A critical issue caused sporadic failures in displaying video streams of partners using the LiveKit SwiftUI SDK across iOS and visionOS platforms. **The root cause was premature signaling of “connected” status before confirming local video track publication completion**, causing peers to misinterpret connection readiness. — ## Root Cause The failure stemmed from **race … Read more

What does PoissonRegression.predict() actually return in sklearn?

Summary The PoissonRegression.predict() function in scikit-learn returns the predicted value of the target variable, which is the expected count of events occurring in a fixed interval of time or space. This value is based on the Poisson distribution, a discrete probability distribution that models the number of events occurring in a fixed interval. Root Cause … Read more

instanceof behavior when comparing a variable

Summary An instanceof Uuid check always returned false despite explicit type annotation (const warehouse_id: Uuid). The root cause was type annotation erasure in TypeScript combined with primitive assignment. Runtime values weren’t instances of the Uuid class since warehouse.id was a primitive (likely a string). Root Cause TypeScript types are purely compile-time constructs. The Uuid type … Read more

Swing spinner widget

Postmortem: UI Freeze Due to Custom Spinner Implementation in Swing Summary After implementing a custom animated spinner widget for a Swing-based application, users reported full UI freezes during operations exceeding 2 seconds. Tracing the issue revealed a critical threading error in the spinner animation logic. Root Cause The UI froze because the spinner implementation violated … Read more