Worked on enhancing error handling for streaming workflows in the langchain4j/langchain4j repository by addressing Ollama API error propagation. Focused on backend development using Java, the work introduced structured error handling across both server and client layers, including the creation of a dedicated exception type to align with existing streaming error patterns. Expanded unit testing with MockWebServer to validate error-only and partial-content scenarios, ensuring all tests passed and preventing future regressions. Code formatting was maintained with Maven Spotless, and comprehensive documentation and test plans were included in pull requests to support maintainability and clarity for future contributors.