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default	Chapter 1: Getting Started and Module Selection	1	MCP Java SDK Tutorial

Chapter 1: Getting Started and Module Selection

Welcome to Chapter 1: Getting Started and Module Selection. In this part of MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring, you will build an intuitive mental model first, then move into concrete implementation details and practical production tradeoffs.

This chapter establishes a clean dependency and runtime baseline for Java MCP projects.

Learning Goals

choose between mcp, mcp-core, and Spring modules
align Java version and build tooling prerequisites
avoid premature coupling to one transport or framework layer
set up reproducible local build/test flows

Module Selection Guide

Module	Use When
`mcp`	you want the convenience bundle for most workloads
`mcp-core`	you need lower-level control and minimal dependencies
`mcp-spring`	you are integrating with Spring WebFlux/WebMVC stacks

First-Run Steps

confirm Java 17+ and Maven wrapper availability
start with mcp unless you have a strict minimal-dependency requirement
run ./mvnw clean install -DskipTests to validate baseline build
move to module-specific integrations only after client/server flows work

Source References

Summary

You now have a stable Java MCP baseline and module decision model.

Next: Chapter 2: SDK Architecture: Reactive Model and JSON Layer

Depth Expansion Playbook

This chapter is expanded to v1-style depth for production-grade learning and implementation quality.

Strategic Context

tutorial: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
tutorial slug: mcp-java-sdk-tutorial
chapter focus: Chapter 1: Getting Started and Module Selection
system context: Mcp Java Sdk Tutorial
objective: move from surface-level usage to repeatable engineering operation

Architecture Decomposition

Define the runtime boundary for Chapter 1: Getting Started and Module Selection.
Separate control-plane decisions from data-plane execution.
Capture input contracts, transformation points, and output contracts.
Trace state transitions across request lifecycle stages.
Identify extension hooks and policy interception points.
Map ownership boundaries for team and automation workflows.
Specify rollback and recovery paths for unsafe changes.
Track observability signals for correctness, latency, and cost.

Operator Decision Matrix

Decision Area	Low-Risk Path	High-Control Path	Tradeoff
Runtime mode	managed defaults	explicit policy config	speed vs control
State handling	local ephemeral	durable persisted state	simplicity vs auditability
Tool integration	direct API use	mediated adapter layer	velocity vs governance
Rollout method	manual change	staged + canary rollout	effort vs safety
Incident response	best effort logs	runbooks + SLO alerts	cost vs reliability

Failure Modes and Countermeasures

Failure Mode	Early Signal	Root Cause Pattern	Countermeasure
stale context	inconsistent outputs	missing refresh window	enforce context TTL and refresh hooks
policy drift	unexpected execution	ad hoc overrides	centralize policy profiles
auth mismatch	401/403 bursts	credential sprawl	rotation schedule + scope minimization
schema breakage	parser/validation errors	unmanaged upstream changes	contract tests per release
retry storms	queue congestion	no backoff controls	jittered backoff + circuit breakers
silent regressions	quality drop without alerts	weak baseline metrics	eval harness with thresholds

Implementation Runbook

Establish a reproducible baseline environment.
Capture chapter-specific success criteria before changes.
Implement minimal viable path with explicit interfaces.
Add observability before expanding feature scope.
Run deterministic tests for happy-path behavior.
Inject failure scenarios for negative-path validation.
Compare output quality against baseline snapshots.
Promote through staged environments with rollback gates.
Record operational lessons in release notes.

Quality Gate Checklist

chapter-level assumptions are explicit and testable
API/tool boundaries are documented with input/output examples
failure handling includes retry, timeout, and fallback policy
security controls include auth scopes and secret rotation plans
observability includes logs, metrics, traces, and alert thresholds
deployment guidance includes canary and rollback paths
docs include links to upstream sources and related tracks
post-release verification confirms expected behavior under load

Source Alignment

Cross-Tutorial Connection Map

Advanced Practice Exercises

Build a minimal end-to-end implementation for Chapter 1: Getting Started and Module Selection.
Add instrumentation and measure baseline latency and error rate.
Introduce one controlled failure and confirm graceful recovery.
Add policy constraints and verify they are enforced consistently.
Run a staged rollout and document rollback decision criteria.

Review Questions

Which execution boundary matters most for this chapter and why?
What signal detects regressions earliest in your environment?
What tradeoff did you make between delivery speed and governance?
How would you recover from the highest-impact failure mode?
What must be automated before scaling to team-wide adoption?

Scenario Playbook 1: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 2: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 3: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 4: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 5: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 6: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 7: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 8: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 9: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 10: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 11: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 12: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 13: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 14: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 15: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 16: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 17: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 18: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 19: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 20: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 21: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 22: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 23: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 24: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 25: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 26: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 27: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 28: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 29: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 30: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 31: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: incoming request volume spikes after release
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: introduce adaptive concurrency limits and queue bounds
verification target: latency p95 and p99 stay within defined SLO windows
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 32: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: tool dependency latency increases under concurrency
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: enable staged retries with jitter and circuit breaker fallback
verification target: error budget burn rate remains below escalation threshold
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 33: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: schema updates introduce incompatible payloads
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: pin schema versions and add compatibility shims
verification target: throughput remains stable under target concurrency
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 34: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: environment parity drifts between staging and production
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: restore environment parity via immutable config promotion
verification target: retry volume stays bounded without feedback loops
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 35: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: access policy changes reduce successful execution rates
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: re-scope credentials and rotate leaked or stale keys
verification target: data integrity checks pass across write/read cycles
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

Scenario Playbook 36: Chapter 1: Getting Started and Module Selection

tutorial context: MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring
trigger condition: background jobs accumulate and exceed processing windows
initial hypothesis: identify the smallest reproducible failure boundary
immediate action: protect user-facing stability before optimization work
engineering control: activate degradation mode to preserve core user paths
verification target: audit logs capture all control-plane mutations
rollback trigger: pre-defined quality gate fails for two consecutive checks
communication step: publish incident status with owner and ETA
learning capture: add postmortem and convert findings into automated tests

What Problem Does This Solve?

Most teams struggle here because the hard part is not writing more code, but deciding clear boundaries for core abstractions in this chapter so behavior stays predictable as complexity grows.

In practical terms, this chapter helps you avoid three common failures:

coupling core logic too tightly to one implementation path
missing the handoff boundaries between setup, execution, and validation
shipping changes without clear rollback or observability strategy

After working through this chapter, you should be able to reason about Chapter 1: Getting Started and Module Selection as an operating subsystem inside MCP Java SDK Tutorial: Building MCP Clients and Servers with Reactor, Servlet, and Spring, with explicit contracts for inputs, state transitions, and outputs.

Use the implementation notes around execution and reliability details as your checklist when adapting these patterns to your own repository.

How it Works Under the Hood

Under the hood, Chapter 1: Getting Started and Module Selection usually follows a repeatable control path:

Context bootstrap: initialize runtime config and prerequisites for core component.
Input normalization: shape incoming data so execution layer receives stable contracts.
Core execution: run the main logic branch and propagate intermediate state through state model.
Policy and safety checks: enforce limits, auth scopes, and failure boundaries.
Output composition: return canonical result payloads for downstream consumers.
Operational telemetry: emit logs/metrics needed for debugging and performance tuning.

When debugging, walk this sequence in order and confirm each stage has explicit success/failure conditions.

Source Walkthrough

Use the following upstream sources to verify implementation details while reading this chapter:

Java SDK README Why it matters: authoritative reference on Java SDK README (github.com).
Core Bundle README Why it matters: authoritative reference on Core Bundle README (github.com).
Spring WebFlux README Why it matters: authoritative reference on Spring WebFlux README (github.com).
Spring WebMVC README Why it matters: authoritative reference on Spring WebMVC README (github.com).
Conformance Client README Why it matters: authoritative reference on Conformance Client README (github.com).
Conformance Server README Why it matters: authoritative reference on Conformance Server README (github.com).
Security Policy Why it matters: authoritative reference on Security Policy (github.com).
Contributing Guide Why it matters: authoritative reference on Contributing Guide (github.com).

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