Java on OCI: Develop a REST-Based Microservice — Lesson 4: Observability, Resilience, Security, CI/CD Awareness, and Handoff

Learning Objectives

• Explain the purpose and operating context of structured logs, metrics, tracing, correlation IDs, alarms, and dashboards.
• Apply timeouts, retries, circuit breakers, bulkheads, and graceful degradation and TLS, headers, input safety, token validation, and dependency security in a controlled environment.
• Validate outcomes and troubleshoot risks involving automated tests, release checks, rollback, cost review, and microservice runbook.

Detailed Topics

• structured logs, metrics, tracing, correlation IDs, alarms, and dashboards
• timeouts, retries, circuit breakers, bulkheads, and graceful degradation
• TLS, headers, input safety, token validation, and dependency security
• automated tests, release checks, rollback, cost review, and microservice runbook

Instructor Demonstration

Demonstrate structured logs, metrics, tracing, correlation IDs, alarms, and dashboards for a small inventory microservice packaged, deployed, secured, and monitored on OCI; capture the exact configuration, code, command, transaction, query, dashboard, model, schedule, or report evidence that proves the expected result.

Hands-On Exercise

Complete a controlled Java on OCI: Develop a REST-Based Microservice exercise covering timeouts, retries, circuit breakers, bulkheads, and graceful degradation and TLS, headers, input safety, token validation, and dependency security; introduce an exception involving automated tests, release checks, rollback, cost review, and microservice runbook, diagnose it from evidence, apply the smallest reversible correction, and rerun acceptance checks.

1. Confirm scope, prerequisites, identities, dependencies, data, risks, and expected outcome.
2. Perform the course-specific configuration, development, administration, analysis, or business-process workflow.
3. Capture commands, settings, records, logs, screenshots, reports, metrics, or test results.
4. Compare the observed result with acceptance criteria and document corrective or preventive action.

Scenario Analysis

• Identify the technical or business decision and the stakeholders affected by it.
• Compare security, performance, reliability, compliance, cost, usability, and support trade-offs.
• Define rollback, recovery, communication, evidence, ownership, and escalation requirements.

Troubleshooting Guidance

Diagnose issues involving structured logs, metrics, tracing, correlation IDs, alarms, and dashboards, timeouts, retries, circuit breakers, bulkheads, and graceful degradation, TLS, headers, input safety, token validation, and dependency security, automated tests, release checks, rollback, cost review, and microservice runbook without making an unverified production change. Separate symptoms from causes, gather time-correlated evidence, test a reversible hypothesis, validate the correction, and record recurrence controls.

Validation Checklist

• The requirement, environment, inputs, dependencies, and expected result are documented.
• The result is reproducible and supported by product-specific evidence.
• Normal, boundary, failure, security, performance, and operational conditions are reviewed.
• Exceptions, rollback, ownership, support actions, and the next improvement priority are recorded.

Lesson Outcome

Learners can apply Observability, Resilience, Security, CI/CD Awareness, and Handoff in a realistic Java on OCI: Develop a REST-Based Microservice scenario and defend the result with documented evidence.