Oracle WebLogic Server 14c: Troubleshooting Workshop — Lesson 4: JVM, Threads, Memory, CPU, Network, Security, and Root-Cause Closure

Learning Objectives

• Explain the purpose and operating context of stuck threads, deadlocks, thread-pool pressure, and request correlation.
• Apply heap, garbage collection, native memory, CPU, and file-descriptor evidence and DNS, firewall, SSL, certificate, authentication, and authorization failures in a controlled environment.
• Validate outcomes and troubleshoot risks involving fix validation, rollback, monitoring, problem record, and troubleshooting runbook.

Detailed Topics

• stuck threads, deadlocks, thread-pool pressure, and request correlation
• heap, garbage collection, native memory, CPU, and file-descriptor evidence
• DNS, firewall, SSL, certificate, authentication, and authorization failures
• fix validation, rollback, monitoring, problem record, and troubleshooting runbook

Instructor Demonstration

Demonstrate stuck threads, deadlocks, thread-pool pressure, and request correlation for a WebLogic domain investigated through four production incidents with overlapping symptoms; 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 Oracle WebLogic Server 14c: Troubleshooting Workshop exercise covering heap, garbage collection, native memory, CPU, and file-descriptor evidence and DNS, firewall, SSL, certificate, authentication, and authorization failures; introduce an exception involving fix validation, rollback, monitoring, problem record, and troubleshooting 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 stuck threads, deadlocks, thread-pool pressure, and request correlation, heap, garbage collection, native memory, CPU, and file-descriptor evidence, DNS, firewall, SSL, certificate, authentication, and authorization failures, fix validation, rollback, monitoring, problem record, and troubleshooting 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 JVM, Threads, Memory, CPU, Network, Security, and Root-Cause Closure in a realistic Oracle WebLogic Server 14c: Troubleshooting Workshop scenario and defend the result with documented evidence.