Jvm

Today we dove deep into JVM architecture while transforming our Library Management System to embrace immutability. The code changes from this session can be found here. Day 7 Summary Overview Explored JVM architecture through our practical projects while evolving the Library Management System to use immutable records for state management. Environment & Tools Proper Java version management (OpenJDK 21) Git workflow Package structure and compilation JVM verbose class loading Concepts Covered JVM Architecture Class loading lifecycle Dynamic class loading patterns Memory management principles Garbage collection basics Immutability Patterns Record types for borrowing events State vs Event sourcing Clean separation of concerns Audit trail implementation System Evolution Removed mutable state from BookCopy Introduced BorrowingRecord Enhanced BorrowingService responsibilities Improved interface segregation Resource Management Proper datetime formatting String representation patterns Efficient optional handling History tracking implementation Implementation Progress Created immutable BorrowingRecord Updated BorrowingService for history tracking Simplified BookCopy class Enhanced system observability Improved separation of concerns Key Takeaways JVM’s efficient handling of immutable objects Benefits of event-sourced state management Clean separation of responsibilities Importance of proper version management Value of comprehensive audit trails Next Steps Ready to explore: ...

Today we delved into the inner workings of the JVM while adding sophisticated debugging capabilities to our card game. The code changes from this session can be found here. Day 6 Summary Overview Explored JVM architecture concepts, memory management, and control flow patterns while enhancing the Card Game project with debug features and resource management. Environment & Tools Git workflow with meaningful commits IntelliJ IDEA Java resource management patterns Concepts Covered JVM Memory Management Stack vs Heap understanding Object lifecycle management Card recycling implementation Reference management patterns Resource Management AutoCloseable interface implementation Try-with-resources pattern Scanner resource cleanup Proper cleanup patterns Display Mode System Global configuration management DEBUG/PLAYER mode implementations Clean string representations Consistent output formatting Modern Java Features Switch expressions String formatting Stream operations Record implementations Design Patterns & Principles Single Responsibility Principle Clean Code practices Configuration management Resource lifecycle management Implementation Progress Implemented card recycling system with discard pile Added proper resource management to GameConsole Created system-wide display mode configuration Enhanced domain objects with debug information Improved console interface and commands Key Takeaways JVM memory management influences design decisions Proper resource cleanup is crucial for robust applications Global configuration can enhance debugging capabilities String representation can vary based on context Clean code principles lead to maintainable solutions Next Steps Ready to explore: ...