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Java Version Upgrade Task

Purpose

Upgrade an existing Java application from an older version to Java 21. Handles dependency updates, code modernization, testing validation, and deployment for Java version migrations.

When to Use

Upgrading from Java 8, 11, or 17 to Java 21
Modernizing legacy Java applications
Improving application performance and security
Adopting new Java language features

Input Requirements

Current Java version and application details
Target Java version (Java 21 recommended)
Application dependencies and frameworks
Current build system configuration
Testing requirements
Deployment environment details

Process Steps

1. Current State Analysis

Analyze current Java version and features used
Identify deprecated APIs and patterns
Assess code quality and technical debt
Evaluate framework compatibility
Review performance characteristics
Document current configuration

2. Dependency Compatibility Check

Check all dependencies for Java 21 compatibility
Identify incompatible dependencies
Research alternative libraries
Plan dependency upgrade strategy
Update Maven/Gradle dependencies
Resolve dependency conflicts

3. Code Modernization

Update code to use Java 21 features
Replace deprecated APIs
Implement modern Java patterns
Optimize performance with new features
Update exception handling
Improve code quality

4. Build System Update

Update Maven/Gradle configuration
Update compiler plugin settings
Update build profiles
Update CI/CD pipeline configuration
Test build process
Validate build output

5. Testing and Validation

Update test frameworks for Java 21
Run comprehensive test suite
Perform performance testing
Conduct security testing
Validate application functionality
Test deployment process

6. Deployment Preparation

Update deployment scripts
Update container images
Update AWS infrastructure
Update monitoring configuration
Prepare rollback procedures
Plan deployment strategy

Output Deliverables

Java 21 compatible application
Updated dependencies and build configuration
Modernized code with Java 21 features
Comprehensive test results
Updated deployment configuration
Migration documentation

Success Criteria

Application successfully upgraded to Java 21
All dependencies updated and compatible
Code modernized with Java 21 features
All tests passing
Performance maintained or improved
Security vulnerabilities addressed
Application deployed successfully

Dependencies

Java 21 JDK installed
Updated build tools
Compatible IDE
Updated testing frameworks
AWS infrastructure access

Tools and Resources

Java 21 JDK
Maven/Gradle build tools
IDE with Java 21 support
Testing frameworks
Performance testing tools
Security scanning tools
AWS CLI and tools