feat(samples/cloudwatch-applicationsignals-mcp): add docker java springboot app

[yiyuan-he]

Fixes

Summary

Adding Docker Java Spring Boot app to our enablement tool testing infra.

Changes

This PR adds a new Java Spring Boot baseline application for testing AWS Application Signals enablement via the get_enablement_guide MCP tool. The application is designed to run as a Docker container on EC2.

New files added:

• docker-apps/java/spring-boot/ - Complete Spring Boot application with:
  • Multi-stage Dockerfile using Maven 3.9 and Amazon Corretto 17
  • REST API with three endpoints: /, /health, and /api/buckets
  • AWS SDK S3 integration to list S3 buckets
  • Traffic generation script for continuous testing
  • Maven POM with Spring Boot 3.2.0 and AWS SDK dependencies
  • infrastructure/ec2/cdk/config/java-springboot.json - CDK configuration for deployment

Documentation updates:

• Updated README.md with Java Spring Boot app build/deploy instructions
• Added java-springboot to ECR repository table
• Added JavaSpringBootCdkStack to CDK stack deployment table

User experience

N/A

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N) N

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.26%. Comparing base (9fbbd27) to head (951d2f5).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1717   +/-   ##
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  Coverage   90.26%   90.26%           
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  Files         781      781           
  Lines       59912    59912           
  Branches     9718     9718           
=======================================
  Hits        54077    54077           
  Misses       3646     3646           
  Partials     2189     2189           

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[Copilot]

Pull Request Overview

This PR adds a new Java Spring Boot baseline application to support AWS Application Signals enablement testing via the get_enablement_guide MCP tool. The application is containerized and designed to run on EC2.

• Complete Java Spring Boot application with REST API endpoints and AWS S3 integration
• Multi-stage Docker build using Maven 3.9 and Amazon Corretto 17
• Traffic generation script for continuous testing

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
Controller.java	Implements REST API with three endpoints (/, /health, /api/buckets) and S3 integration
Application.java	Standard Spring Boot application entry point
application.properties	Configures server port and logging levels
pom.xml	Maven project configuration with Spring Boot 3.2.0 and AWS SDK dependencies
Dockerfile	Multi-stage build with security features (non-root user, health checks)
generate-traffic.sh	Bash script for continuous traffic generation to test endpoints
README.md	Updated documentation with Java Spring Boot build and deployment instructions

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[yiyuan-he]

Failing trivy and precommit checks should be resolved once the following are merged:

• fix: deeper image name for samples #1719
• fix: add slash license headers #1720

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