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Languages & runtimes · #java
Attach the OpenTelemetry Java agent at JVM startup to get traces with zero code changes — here's the exact configuration, how to verify spans arrive, and the silent-failure mistakes to avoid.
A technical diagnostic guide for fixing NetBeans build errors, missing libraries, JDK mismatches, and performance issues.
An architecture note on auto-instrumenting Spring Boot with the Datadog Java APM agent: minimal design, PII and agent-conflict boundaries, verification checks, and when to switch to manual spans.
Learn how to use Java Records as minimal, immutable DTOs for cross-service communication, including strategies for validation, defensive copying, and avoiding binary compatibility issues.
Java records (finalized in JDK 16) eliminate the constructor/getter/equals/hashCode/toString ceremony for data carriers. A worked Point2D example, bytecode inspection, and honest limitations.
Stop guessing if a method is unused. Learn how to use IntelliJ IDEA's Safe Delete to perform whole-project usage analysis and prune dead code without breaking your build.
Learn how to use JUnit 5's assertThrows to verify exceptions, see a concrete code example, and avoid common pitfalls.
Dropwizard's built-in HealthCheck system gives services a standard /healthcheck view of dependency readiness without custom endpoints, plus the trade-offs to plan for.
Maven picks dependency versions by nearest-wins, not highest-wins — so your declared upgrade can silently lose. Diagnose with dependency:tree and fix with pins, exclusions, or Enforcer.
opentelemetry
datadog
jetbrains
junit
dropwizard
maven