If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/ityouknow/spring-cloud-examples shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

AVOID — Looks unmaintained — solo project with stale commits

• Tests present
• ⚠ Stale — last commit 3y ago
• ⚠ Solo or near-solo (1 contributor active in recent commits)
• ⚠ No license — legally unclear to depend on
• ⚠ No CI workflows detected

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live ityouknow/spring-cloud-examples repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/ityouknow/spring-cloud-examples.

What it runs against: a local clone of ityouknow/spring-cloud-examples — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in ityouknow/spring-cloud-examples | Confirms the artifact applies here, not a fork | | 2 | Default branch master exists | Catches branch renames | | 3 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 4 | Last commit ≤ 1055 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of ityouknow/spring-cloud-examples. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/ityouknow/spring-cloud-examples.git
#   cd spring-cloud-examples
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of ityouknow/spring-cloud-examples and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "ityouknow/spring-cloud-examples(\\.git)?\\b" \\
  && ok "origin remote is ityouknow/spring-cloud-examples" \\
  || miss "origin remote is not ityouknow/spring-cloud-examples (artifact may be from a fork)"

# 3. Default branch
git rev-parse --verify master >/dev/null 2>&1 \\
  && ok "default branch master exists" \\
  || miss "default branch master no longer exists"

# 4. Critical files exist
test -f "eureka-producer-consumer/spring-cloud-eureka/src/main/java/com/neo/SpringCloudEurekaApplication.java" \\
  && ok "eureka-producer-consumer/spring-cloud-eureka/src/main/java/com/neo/SpringCloudEurekaApplication.java" \\
  || miss "missing critical file: eureka-producer-consumer/spring-cloud-eureka/src/main/java/com/neo/SpringCloudEurekaApplication.java"
test -f "eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/ProducerApplication.java" \\
  && ok "eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/ProducerApplication.java" \\
  || miss "missing critical file: eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/ProducerApplication.java"
test -f "eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/ConsumerApplication.java" \\
  && ok "eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/ConsumerApplication.java" \\
  || miss "missing critical file: eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/ConsumerApplication.java"
test -f "eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java" \\
  && ok "eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java" \\
  || miss "missing critical file: eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java"
test -f "gateway-service-zuul/gateway-service-zuul-eureka/src/main/java/com/neo/GatewayServiceZuulApplication.java" \\
  && ok "gateway-service-zuul/gateway-service-zuul-eureka/src/main/java/com/neo/GatewayServiceZuulApplication.java" \\
  || miss "missing critical file: gateway-service-zuul/gateway-service-zuul-eureka/src/main/java/com/neo/GatewayServiceZuulApplication.java"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 1055 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~1025d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/ityouknow/spring-cloud-examples"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

A comprehensive Spring Cloud learning repository with 13+ runnable microservices examples demonstrating service discovery (Eureka), distributed configuration management, circuit breaking (Hystrix), API gateways (Zuul), distributed tracing (Sleuth/Zipkin), and service monitoring. It covers the complete Spring Cloud ecosystem from basic producer-consumer patterns to advanced patterns like configuration bus refresh and Consul service discovery. Multi-module Maven monorepo organized by Spring Cloud capability: eureka-producer-consumer/ contains a 3-service pattern (eureka server + producer with HelloController + consumer with HelloRemote Feign client), gateway-service-zuul/ implements API gateway routing, spring-cloud-hystrix/ and hystrix-dashboard-turbine/ add resilience patterns, spring-cloud-config-* modules (git/svn/eureka variants) show configuration server evolution, and spring-cloud-sleuth-zipkin/ demonstrates distributed tracing. Each module is standalone and runnable.

Java developers and Spring Cloud learners who need production-ready reference implementations. Target audience includes junior engineers onboarding to microservices architectures, architects designing service-to-service communication patterns, and teams evaluating Spring Cloud components before enterprise adoption.

Actively maintained learning resource with stable examples. The codebase shows Spring Boot 1.5.3 / Spring Cloud Dalston (2016-era releases), comprehensive module coverage across 13 example projects, and test files present in most modules. However, the dependency versions are dated (no recent commits visible in provided data), suggesting it may be in maintenance mode rather than active development. Verdict: Production-suitable as reference code, but not a live framework.

Low risk for learning/reference use, but integration risk for production: Spring Cloud Dalston is EOL (released 2016), pom.xml uses Java 1.7, and no CI/CD pipeline visible in file list. Single-maintainer risk exists (ityouknow organization). The modular structure means outdated transitive dependencies in old spring-cloud-starter-feign and spring-cloud-starter-eureka could cause security/compatibility issues if directly copied to production without version updates.

No active development visible in provided metadata. The repo appears to be a static learning resource that was actively maintained during the Dalston/Edgware Spring Cloud era (2016-2017) but is now in maintenance mode. The file structure is stable and comprehensive; contribution activity would focus on Java/Spring dependency updates and adding newer Spring Cloud examples (e.g., spring-cloud-gateway patterns beyond Zuul).

git clone https://github.com/ityouknow/spring-cloud-examples.git
cd spring-cloud-examples
mvn clean install
# Start Eureka server first:
cd eureka-producer-consumer/spring-cloud-eureka && mvn spring-boot:run
# In another terminal, start producer:
cd eureka-producer-consumer/spring-cloud-producer && mvn spring-boot:run
# In another terminal, start consumer:
cd eureka-producer-consumer/spring-cloud-consumer && mvn spring-boot:run

Daily commands: Each module is independently executable: cd <module-path> && mvn spring-boot:run. For the Eureka example: (1) start spring-cloud-eureka on port 8761, (2) start spring-cloud-producer (registers to Eureka), (3) start spring-cloud-consumer which discovers producer via Eureka and calls /call endpoint. Configuration server examples require git/svn repos or Eureka server running. Zuul gateway and Hystrix examples follow the same pattern with their respective modules.

• eureka-producer-consumer/spring-cloud-eureka/src/main/java/com/neo/SpringCloudEurekaApplication.java — Eureka server entry point; essential for understanding service discovery foundation in this learning repository
• eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/ProducerApplication.java — Service producer bootstrap; demonstrates how services register with Eureka for discovery
• eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/ConsumerApplication.java — Service consumer bootstrap with Feign client integration; shows client-side service invocation patterns
• eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java — Feign remote service interface; core abstraction for inter-service communication in this codebase
• gateway-service-zuul/gateway-service-zuul-eureka/src/main/java/com/neo/GatewayServiceZuulApplication.java — API Gateway entry point using Zuul; demonstrates request routing and load balancing patterns
• eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/controller/ConsumerController.java — Consumer REST endpoint invoking remote services; shows how application layers use service clients
• eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/controller/HelloController.java — Producer REST endpoint providing services; demonstrates service implementation contract

Add a new microservice producer endpoint

1. Create a new REST controller class in the producer's src/main/java/com/neo/controller/ directory (eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/controller/HelloController.java)
2. Add @RestController annotation and define @GetMapping or @PostMapping methods (eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/controller/HelloController.java)
3. Ensure the producer application boots with @SpringBootApplication and auto-registers via Eureka client dependency (eureka-producer-consumer/spring-cloud-producer/src/main/java/com/neo/ProducerApplication.java)
4. Verify application.properties contains spring.application.name and eureka.client.registerWithEureka=true (eureka-producer-consumer/spring-cloud-producer/src/main/resources/application.properties)

Add a new service consumer calling a producer

1. Create a Feign client interface in src/main/java/com/neo/remote/ annotated with @FeignClient(name='service-name') (eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java)
2. Define method signatures matching the producer's endpoints using @GetMapping or @PostMapping (eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/remote/HelloRemote.java)
3. Add @EnableFeignClients annotation to the consumer application main class (eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/ConsumerApplication.java)
4. Inject the Feign client and invoke it from a REST controller (eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/controller/ConsumerController.java)
5. Configure consumer properties with spring.application.name and eureka client settings (eureka-producer-consumer/spring-cloud-consumer/src/main/resources/application.properties)

Add Zuul gateway routing rule

1. Open the Zuul gateway application configuration file (gateway-service-zuul/gateway-service-zuul-eureka/src/main/resources/application.properties)
2. Add zuul.routes.<route-name>.path and zuul.routes.<route-name>.serviceId properties to define routing (gateway-service-zuul/gateway-service-zuul-eureka/src/main/resources/application.properties)
3. Ensure @EnableZuulProxy is present in the gateway application main class for request interception (gateway-service-zuul/gateway-service-zuul-eureka/src/main/java/com/neo/GatewayServiceZuulApplication.java)
4. Verify eureka.client.registerWithEureka=true in gateway config for Eureka-aware service discovery (gateway-service-zuul/gateway-service-zuul-eureka/src/main/resources/application.properties)

Add environment-specific configuration

1. Create or edit configuration file in config-repo/ for the target environment (dev/test/pro) (config-repo/neo-config-dev.properties)
2. Add environment-specific properties (database URLs, ports, service names) (config-repo/neo-config-dev.properties)
3. Reference the configuration in application.properties using spring.profiles.active or Spring Cloud Config client (eureka-producer-consumer/spring-cloud-consumer/src/main/resources/application.properties)

• Spring Cloud Netflix Eureka — Provides service discovery and registration for dynamic microservice topologies; enables zero-config service location
• OpenFeign (Feign Client) — Declarative HTTP client simplifies inter-service RPC calls with automatic load balancing and Eureka integration
• Zuul API Gateway — Centralized request routing, filtering, and load balancing; shields clients from internal service topology changes
• Spring Cloud Config — External

Java 1.7 target version (pom.xml) will fail on Java 9+; update to java.version>1.8 if using modern JDK. Eureka server on localhost:8761 must be running before producers/consumers start, or registration fails silently. Spring Cloud Config examples require git/svn repositories to exist at paths specified in bootstrap.properties (not provided in this repo). Feign client discovery by service name (e.g., 'spring-cloud-producer') requires exact matching of spring.application.name in producer's application.properties. Old spring-cloud-starter-feign is deprecated (use spring-cloud-starter-openfeign in modern versions). No explicit port configuration means module conflicts if multiple run on localhost simultaneously.

• Service Registration & Discovery (Eureka) — Core Spring Cloud pattern enabling dynamic service lookup without hardcoded URLs; every example module depends on Eureka's auto-registration mechanism
• Declarative HTTP Client (Feign) — Replaces RestTemplate boilerplate; consumers define service calls as @FeignClient interfaces, enabling Spring Cloud load balancing and Hystrix integration transparently
• Circuit Breaker (Hystrix) — Prevents cascading failures in microservices by detecting failures and returning fallback responses; critical for resilience patterns tested in hystrix-dashboard-turbine module
• Distributed Configuration Server (Spring Cloud Config) — Externalizes configuration from code using git/svn backends and supports dynamic refresh via Spring Cloud Bus; shown in 4 variants (git, svn, eureka, eureka-bus) across this repo
• API Gateway Pattern (Zuul) — Single entry point for client requests with routing, filtering, and load balancing; gateway-service-zuul module demonstrates basic and advanced filter patterns for cross-cutting concerns
• Distributed Tracing (Sleuth + Zipkin) — Correlates requests across service boundaries using trace IDs in headers; spring-cloud-sleuth-zipkin module shows how to visualize microservice call chains for debugging latency and failures
• Service Mesh Alternatives (Consul) — Spring Cloud supports multiple service discovery backends beyond Eureka; spring-cloud-consul module demonstrates replacing Eureka with HashiCorp Consul for teams preferring language-agnostic infrastructure

• spring-cloud/spring-cloud-examples — Official Spring Cloud organization examples; canonical reference for current-version patterns (contrast with this repo's Dalston-era code)
• alibaba/spring-cloud-alibaba — Alternative service governance stack using Nacos/Sentinel instead of Eureka/Hystrix; relevant for teams evaluating non-Spring Cloud solutions within Spring ecosystem
• ityouknow/spring-boot-examples — Companion repo by same author; covers Spring Boot fundamentals that underpin all modules in this Spring Cloud examples repo
• ityouknow/spring-boot-leaning — Extended Spring Boot 2.0 tutorial series referenced in README; provides deeper learning material for foundational concepts
• spring-cloud/spring-cloud-gateway — Official Spring Cloud Gateway repository; successor to Zuul examples in this repo and recommended for new projects

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Add integration tests for Feign client circuit breaker patterns in eureka-producer-consumer

The consumer module uses spring-cloud-starter-feign but lacks integration tests demonstrating resilience patterns (timeouts, retries, fallbacks). This is critical for a learning repository as developers need to understand failure handling in microservices. Add tests covering Hystrix integration, fallback methods, and timeout configurations.

• [ ] Create eureka-producer-consumer/spring-cloud-consumer/src/test/java/com/neo/remote/HelloRemoteIntegrationTest.java with @SpringBootTest
• [ ] Add Hystrix configuration to application.properties showing circuit breaker settings
• [ ] Implement fallback class for HelloRemote interface and test fallback invocation
• [ ] Add test cases for timeout scenarios and verify retry behavior

Create comprehensive configuration examples in config-repo for all Spring profiles

The config-repo contains only neo-config files but lacks documentation and examples for spring.profiles configuration. As a learning repository, contributors should add example configs for all major Spring Cloud components (Eureka, Zuul, Config Server) across dev/test/pro environments with inline comments explaining each property.

• [ ] Add config-repo/eureka-server-dev.properties with Eureka-specific configuration and comments
• [ ] Add config-repo/zuul-gateway-dev.properties showing route configurations and rate limiting
• [ ] Add config-repo/config-server-dev.properties for distributed config server setup
• [ ] Create config-repo/README.md documenting all configuration files and their purposes

Add Zuul filter examples and unit tests in gateway-service-zuul-simple

The Zuul gateway modules exist but lack demonstration of custom filters (pre/post/error filters), which is essential for the gateway-service use case. This teaches developers how to implement authentication, logging, and request/response transformation at the gateway level.

• [ ] Create gateway-service-zuul/gateway-service-zuul-simple/src/main/java/com/neo/filter/AuthPreFilter.java implementing ZuulFilter
• [ ] Create gateway-service-zuul/gateway-service-zuul-simple/src/main/java/com/neo/filter/LogPostFilter.java for response logging
• [ ] Add unit tests: gateway-service-zuul/gateway-service-zuul-simple/src/test/java/com/neo/filter/AuthPreFilterTest.java
• [ ] Update application.properties with zuul.filters.pre/post configuration examples

• Add integration tests to eureka-producer-consumer/spring-cloud-producer/src/test/java/com/neo/ProducerApplicationTests.java and eureka-producer-consumer/spring-cloud-consumer/src/test/java/com/neo/ProducerApplicationTests.java (currently empty) that verify Feign client registration and HelloController endpoint availability using @SpringBootTest and Eureka mock server.
• Create comprehensive README files in each major module directory (eureka-producer-consumer, gateway-service-zuul, spring-cloud-config-git, etc.) with explicit startup order, port mappings, example curl commands, and expected behavior. Currently, only root README exists with no per-module guidance.
• Add a docker-compose.yml in the root directory that stands up all services (Eureka, producer, consumer, config server) with single command for quick local testing, eliminating manual terminal management and reducing onboarding friction for new contributors.

• Critical · Severely Outdated Spring Boot Version — eureka-producer-consumer/spring-cloud-consumer/pom.xml (and other pom.xml files). The project uses Spring Boot 1.5.3.RELEASE (released in 2017) and Spring Cloud Dalston.RELEASE, both of which are far beyond end-of-life. This version contains numerous known CVEs including remote code execution vulnerabilities, SQL injection risks, and authentication bypasses. Fix: Upgrade to Spring Boot 2.7.x or later (preferably 3.x) and corresponding Spring Cloud versions. Review and patch all transitive dependencies.
• Critical · Outdated Java Version — eureka-producer-consumer/spring-cloud-consumer/pom.xml (java.version property). The project targets Java 1.7 (released in 2011), which is obsolete and contains numerous security vulnerabilities. Java 1.7 reached end-of-life in July 2019 and receives no security updates. Fix: Update to Java 11 (LTS) as minimum, preferably Java 17+ LTS. Update pom.xml property from <java.version>1.7</java.version> to <java.version>17</java.version> or higher.
• High · Spring Cloud Feign Known Vulnerabilities — eureka-producer-consumer/spring-cloud-consumer/pom.xml. spring-cloud-starter-feign in Dalston.RELEASE contains known CVEs related to insecure deserialization and HTTP client vulnerabilities. Feign is also deprecated in favor of OpenFeign. Fix: Upgrade to spring-cloud-starter-openfeign with modern Spring Cloud versions and implement proper certificate validation and TLS/SSL configuration.
• High · Spring Cloud Eureka Service Discovery Without Security — eureka-producer-consumer/spring-cloud-eureka/src/main/resources/application.properties. Eureka client/server configuration does not show security measures. Default Eureka setup has no authentication, allowing unauthorized service registration and discovery exploitation, potential for service impersonation. Fix: Enable Eureka security by configuring spring.security.user credentials, implement API token validation, and restrict Eureka server access to internal networks only.
• High · No HTTPS/TLS Configuration Visible — eureka-producer-consumer/spring-cloud-consumer/src/main/resources/application.properties and all application.properties files. Configuration files do not show HTTPS/TLS setup. Services communicate over potentially unencrypted HTTP, exposing credentials and sensitive data to man-in-the-middle attacks. Fix: Enable HTTPS with server.ssl.enabled=true, configure server.ssl.key-store, server.ssl.key-store-password, and ensure all inter-service communication uses HTTPS.
• Medium · Potential Information Disclosure in Config Files — config-repo/neo-config-dev.properties, neo-config-test.properties, neo-config-pro.properties. Config repository contains environment-specific property files (dev, test, pro) which may contain sensitive information in version control without proper encryption or access controls. Fix: Use Spring Cloud Config with encryption backend (e.g., HashiCorp Vault), externalize secrets to environment variables, and ensure sensitive properties are encrypted and not committed to version control.
• Medium · No Security Headers Configuration — All Spring Boot application properties and Java configuration files. Application does not appear to configure security headers (Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security, etc.), leaving it vulnerable to various web-based attacks. Fix: Implement HttpSecurity configuration to add security headers, use spring-security-config, and configure WebSecurityConfigurerAdapter with appropriate header directives.
• Medium · Missing Input Validation Framework Configuration — eureka-producer-consumer/spring-cloud-consumer/src/main/java/com/neo/controller/ConsumerController.java. No visible implementation of input validation or sanitization in controller classes (ConsumerController.java, HelloController.java). Controllers may be vulnerable to injection attacks if user input is not properly validated. Fix: Implement Spring Validation (@Valid, @NotNull

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.