# Java Microservice Checklist

## Microservice Planning Phase

### Architecture Design

- [ ] Domain boundaries defined
- [ ] Service responsibilities identified
- [ ] Inter-service communication patterns defined
- [ ] Data ownership boundaries established
- [ ] Service discovery strategy planned
- [ ] API gateway strategy defined
- [ ] Configuration management strategy planned

### Service Design

- [ ] Service contracts defined
- [ ] API specifications created
- [ ] Data models designed
- [ ] Event schemas defined
- [ ] Service dependencies mapped
- [ ] Failure scenarios analyzed
- [ ] Resilience patterns planned

## Infrastructure Setup Phase

### Spring Cloud Configuration

- [ ] Spring Cloud dependencies added
- [ ] Service discovery configured (Eureka/Consul)
- [ ] API Gateway configured (Spring Cloud Gateway)
- [ ] Configuration server setup
- [ ] Circuit breaker configured (Resilience4j)
- [ ] Load balancing configured
- [ ] Distributed tracing configured

### Development Environment

- [ ] Java 21 JDK installed and configured
- [ ] IDE configured for microservices development
- [ ] Maven wrapper configured
- [ ] Git repositories initialized for each service
- [ ] Local development environment configured
- [ ] Service discovery running locally
- [ ] API Gateway running locally

## Microservice Development Phase

### Individual Service Implementation

- [ ] Spring Boot application created for each service
- [ ] REST controllers implemented
- [ ] Service layer implemented
- [ ] Data layer implemented
- [ ] Business logic implemented
- [ ] Configuration externalized
- [ ] Health checks implemented

### Inter-Service Communication

- [ ] Synchronous communication implemented (REST)
- [ ] Asynchronous communication implemented (if needed)
- [ ] Circuit breaker pattern implemented
- [ ] Retry mechanisms configured
- [ ] Timeout configurations set
- [ ] Load balancing configured
- [ ] Service mesh configured (if using)

### Data Management

- [ ] Database per service implemented
- [ ] Data consistency patterns implemented
- [ ] Event sourcing implemented (if needed)
- [ ] CQRS pattern implemented (if needed)
- [ ] Data migration strategies planned
- [ ] Backup strategies implemented

## Security Implementation

### Microservice Security

- [ ] JWT authentication implemented
- [ ] Service-to-service authentication configured
- [ ] API Gateway security configured
- [ ] Role-based authorization implemented
- [ ] Secrets management configured
- [ ] Network security configured
- [ ] Security testing performed

### Security Best Practices

- [ ] Input validation implemented across services
- [ ] SQL injection prevention
- [ ] XSS protection configured
- [ ] Rate limiting implemented
- [ ] Security headers configured
- [ ] HTTPS enforcement configured
- [ ] Security monitoring implemented

## Testing Implementation

### Service Testing

- [ ] Unit tests for each service created
- [ ] Integration tests for each service created
- [ ] Contract tests implemented
- [ ] End-to-end tests created
- [ ] Performance tests implemented
- [ ] Chaos engineering tests created
- [ ] Security tests implemented

### Microservice Testing

- [ ] Service discovery tests
- [ ] API Gateway tests
- [ ] Circuit breaker tests
- [ ] Load balancing tests
- [ ] Distributed tracing tests
- [ ] Configuration management tests

## AWS Deployment Phase

### Infrastructure Setup

- [ ] AWS account configured
- [ ] VPC and networking configured
- [ ] Security groups configured
- [ ] IAM roles and policies created
- [ ] EKS cluster configured
- [ ] Service mesh configured (Istio/Linkerd)

### Containerization

- [ ] Dockerfiles created for each service
- [ ] Multi-stage builds implemented
- [ ] Docker images optimized
- [ ] Container security hardened
- [ ] Health checks implemented
- [ ] Docker Compose configured for local testing

### Service Deployment

- [ ] Kubernetes manifests created
- [ ] Service definitions created
- [ ] Deployment configurations created
- [ ] Ingress controllers configured
- [ ] Service mesh sidecars configured
- [ ] Auto-scaling configured

### AWS Services Integration

- [ ] AWS Service Discovery configured
- [ ] AWS API Gateway configured
- [ ] AWS Load Balancer configured
- [ ] AWS RDS configured for each service
- [ ] AWS S3 configured for shared resources
- [ ] AWS SQS/SNS configured for messaging

### Monitoring and Observability

- [ ] CloudWatch logging configured
- [ ] Prometheus metrics configured
- [ ] Grafana dashboards created
- [ ] Jaeger/Zipkin tracing configured
- [ ] Health check endpoints implemented
- [ ] Error tracking configured
- [ ] Performance monitoring setup
- [ ] Alerting configured

## Documentation and Handover

### Technical Documentation

- [ ] README.md created for each service
- [ ] API documentation generated
- [ ] Architecture documentation created
- [ ] Database schemas documented
- [ ] Deployment guide written
- [ ] Configuration guide created
- [ ] Troubleshooting guide written

### Operational Documentation

- [ ] Monitoring guide created
- [ ] Backup procedures documented
- [ ] Disaster recovery procedures documented
- [ ] Security procedures documented
- [ ] Maintenance procedures documented
- [ ] Service mesh documentation created
- [ ] Team handover completed

## Go-Live Validation

### Pre-Deployment Checks

- [ ] All tests passing
- [ ] Code review completed
- [ ] Security scan passed
- [ ] Performance testing completed
- [ ] Documentation reviewed
- [ ] Team training completed

### Deployment Validation

- [ ] All services deployed successfully
- [ ] Service discovery working
- [ ] API Gateway working
- [ ] Inter-service communication working
- [ ] Health checks passing
- [ ] Monitoring active

### Post-Deployment Validation

- [ ] All services accessible
- [ ] End-to-end functionality working
- [ ] Performance metrics acceptable
- [ ] Error logging working
- [ ] Circuit breakers working
- [ ] Auto-scaling working
- [ ] Team notified of deployment