Refresh Spring Boot and Couchbase dependencies

[dex-the-ai]

Summary

• bump Spring Boot parent from 4.0.1 to 4.0.3
• bump Couchbase Java client from 3.10.0 to 3.11.1, dotenv-java to 3.2.0, maven-compiler-plugin to 3.15.0, and surefire/failsafe to 3.5.5
• fix .env.example comment drift so it references the current Spring Boot 4.0+ Couchbase property surface

Verification

• JAVA_HOME=/usr/lib/jvm/java-21-openjdk-arm64 ./mvnw clean test -B
• JAVA_HOME=/usr/lib/jvm/java-17-openjdk-arm64 ./mvnw clean test -B
• JAVA_HOME=/usr/lib/jvm/java-17-openjdk-arm64 ./mvnw spring-boot:run -Dspring-boot.run.arguments=--server.port=18080
• curl -I http://127.0.0.1:18080/
• curl -s http://127.0.0.1:18080/swagger-ui/index.html
• curl -s http://127.0.0.1:18080/v3/api-docs
• curl -s http://127.0.0.1:18080/api/v1/airport/airport_1255
• curl -s "http://127.0.0.1:18080/api/v1/airline/list?country=France&limit=2&offset=0"

Evidence

• Baseline main passed locally on JDK 21: 18 tests, 0 failures, 0 errors
• Updated branch passed locally on JDK 17: 18 tests, 0 failures, 0 errors
• Live walkthrough on the updated branch succeeded against local Couchbase / travel-sample
• / redirected to Swagger UI, /v3/api-docs reported Quickstart in Couchbase with Spring Boot with 8 paths, and the airport / airline endpoints returned expected live data
• First spring-boot:run attempt on the default port hit a local 8080 port conflict, so the walkthrough was re-run successfully on 18080
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/verification.md
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/commands.txt
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/baseline-test.log
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/updated-test-jdk17.log
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/app-run-18080.log
• tutorial-maintenance/runs/java-springboot-quickstart/2026-05-05T0145Z-subagent/walkthrough-requests-3.txt

Notes

• No active Dex-owned PR existed for this repo when this pass started.
• I did not attach a Swagger screenshot because browser/screenshot tooling was not available in this subagent runtime; request/response proof and startup logs are included instead.

[dex-the-ai]

Owner ping for this maintenance PR: @teetangh @jdmuntacb

Requesting review from the manifest-listed owner(s) where GitHub does not already show a pending review request.

[gemini-code-assist]

Code Review

This pull request updates several dependency and plugin versions in the pom.xml and modifies the Spring Boot version reference in .env.example. However, the review identifies that most of the proposed versions—including those for Spring Boot, the Couchbase SDK, and various Maven plugins—do not exist in Maven Central and will cause build failures. Additionally, the documentation update refers to a non-existent Spring Boot 4.0 release and should be corrected to a valid version.