Chapter 4: Exception Handling, Logging & Production Support

Operating reliable enterprise services demands predictable error contracts, structured traceability across concurrent threads, proactive health monitoring, and deep telemetry metrics.

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🧭 Subtopics & Curriculum

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Centralized Interceptors4.1

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4.1 Global Exception Handling

• What is Exception Handling?
• Types of Exceptions in Java
• try-catch
• @ExceptionHandler
• @ControllerAdvice
• @RestControllerAdvice
• 1. RFC 7807 ProblemDetail in Spring Boot 3
• 2. Implementing @RestControllerAdvice
• 3. Security Considerations

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Business Modeling4.2

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4.2 Custom Domain Exceptions

• What is Custom Exception
• Why Create Custom Exceptions?
• Clean Domain Exception Hierarchy
• Common HTTP Status Codes
• Designing the Base Exception Class
  • Specialized Concrete Exceptions
• Best Practices & Anti-Patterns

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Traceability4.3

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4.3 Logging with SLF4J & Logback

• Logging
• Logging Levels
• 1. Logging Levels & Thresholds
  • Configuring Levels in application.yml:
• 2. Structured Logging with MDC (Mapped Diagnostic Context)
• 3. Logback Configuration (logback-spring.xml)
• SLF4J
• Why Use SLF4J?

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Health & Ops4.4

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4.4 Spring Boot Actuator

• What is Spring Boot Actuator?
• 1. Key Actuator Endpoints
• 2. Exposing & Securing Actuator in application.yml
• 3. Custom Health Indicators

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Telemetry & APM4.5

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4.5 Metrics & Observability

• 1. Micrometer Core Meter Types
• 2. Programmatic Metrics with MeterRegistry
• 3. Prometheus & Distributed Tracing Integration
  • Prometheus Scraping
  • Distributed Tracing in Spring Boot 3

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