Java Roadmap

Advanced Java programming topics.

29 stages · 115 topics 0% done
Java
✓ Thread Lifecycle & States
✓ synchronized Keyword & Intrinsic Locks
✓ Foundations
✓ java.util.concurrent.locks
✓ ExecutorService & Thread Pools
✓ Core Concepts
✓ CompletableFuture & Async Composition
✓ Volatile & Atomic Variables
✓ ForkJoin Framework
✓ Phaser & CyclicBarrier
✓ Intermediate Skills
✓ JVM Memory Model (JSR 133)
✓ Heap Structure: Generations & Regions
✓ Advanced Topics
✓ Garbage Collection Algorithms
✓ GC Tuning & Ergonomics
✓ Reference Types (Soft, Weak, Phantom)
✓ JVM TI & Attach API
✓ Expert Level
✓ Object Header & Compressed OOPs
✓ Finalization, Cleaner & Reference Cleanup
✓ Mastery
✓ Generic Type System
✓ Type Erasure & Bridge Methods
✓ Wildcards (? extends, ? super)
✓ PECS (Producer Extends, Consumer Super)
✓ Ecosystem
✓ Type Token (Class<T>)
✓ Super Type Token Pattern
✓ Architecture
✓ Reified Generics with JVM Records
✓ Class Object & Class.forName
✓ Method/Field Invocation
✓ Dynamic Proxy (java.lang.reflect.Proxy)
✓ Optimization
✓ Annotation Processing at Runtime
✓ MethodHandle & invokedynamic
✓ Deployment
✓ VarHandle (Java 9+)
✓ Module API for Reflection
✓ Stream Pipeline Internals
✓ Spliterator & Parallel Splitting
✓ Phase 11
✓ Custom Collector Implementation
✓ Gatherer API (Java 22+)
✓ Phase 12
✓ Reduction & Mutable Reduction
✓ Primitive Stream Optimization
✓ Ordering & Encounter Order
✓ Module Declaration (module-info.java)
✓ Phase 13
✓ Exports, Opens & Requires
✓ Service Loader (provides, uses)
✓ Phase 14
✓ Transitive Dependencies
✓ Qualified Exports
✓ Module Layers & Configuration
✓ Migration Strategies (unnamed, automatic modules)
✓ Phase 15
✓ Class File Structure
✓ Bytecode Instruction Set
✓ Phase 16
✓ Stack Frame & Local Variables
✓ ASM Framework for Bytecode Manipulation
✓ Method Inlining & Inline Cache
✓ JIT Compilation (C1, C2, Graal)
✓ Phase 17
✓ Deoptimization & On-Stack Replacement
✓ JNI Method Declaration
✓ Phase 18
✓ JNI Types & Type Signatures
✓ Managing References (Local, Global, Weak)
✓ Exception Handling in JNI
✓ Project Panama (Foreign Memory & Linker)
✓ Phase 19
✓ FFM API (MemorySegment, SymbolLookup)
✓ Callbacks from Native Code
✓ Phase 20
✓ JUnit 5 Extension Model
✓ Parameterized Tests
✓ Mocking with Mockito
✓ TestContainers Integration
✓ Phase 21
✓ AssertJ for Fluent Assertions
✓ Mutation Testing (Pitest)
✓ Phase 22
✓ Benchmarking with JMH
✓ JITWatch & JIT Compilation
✓ String Performance (StringConcatFactory)
✓ Escape Analysis & Stack Allocation
✓ Phase 23
✓ Lock Coarsening & Biased Locking
✓ GC Log Analysis
✓ Phase 24
✓ Flight Recorder (JFR)
✓ Method Profiling with async-profiler
✓ Security Manager (deprecated) & Permissions
✓ Cryptography Provider Architecture
✓ Phase 25
✓ TLS/SSL in Java
✓ JAAS Authentication
✓ Phase 26
✓ Signed JAR & Code Signing
✓ Sealed & Restricted Classes (Java 17)
✓ Deserialization Vulnerabilities
✓ Builder Pattern with Lombok
✓ Phase 27
✓ Strategy with Enums & Lambdas
✓ Visitor Pattern (Accept & Defensive)
✓ Phase 28
✓ Factory Method with ServiceLoader
✓ Singleton (Enum Idiom)
✓ Dependency Injection (Guice, Spring)
✓ Phase 29
✓ Null Object Pattern with Optional
Text version of this roadmap

1. Foundations

  • Thread Lifecycle & States
  • synchronized Keyword & Intrinsic Locks
  • java.util.concurrent.locks

2. Core Concepts

  • ExecutorService & Thread Pools
  • CompletableFuture & Async Composition
  • Volatile & Atomic Variables

3. Intermediate Skills

  • ForkJoin Framework
  • Phaser & CyclicBarrier
  • JVM Memory Model (JSR 133)

4. Advanced Topics

  • Heap Structure: Generations & Regions
  • Garbage Collection Algorithms
  • GC Tuning & Ergonomics

5. Expert Level

  • Reference Types (Soft, Weak, Phantom)
  • JVM TI & Attach API
  • Object Header & Compressed OOPs

6. Mastery

  • Finalization, Cleaner & Reference Cleanup
  • Generic Type System
  • Type Erasure & Bridge Methods

7. Ecosystem

  • Wildcards (? extends, ? super)
  • PECS (Producer Extends, Consumer Super)
  • Type Token (Class<T>)

8. Architecture

  • Super Type Token Pattern
  • Reified Generics with JVM Records
  • Class Object & Class.forName

9. Optimization

  • Method/Field Invocation
  • Dynamic Proxy (java.lang.reflect.Proxy)
  • Annotation Processing at Runtime

10. Deployment

  • MethodHandle & invokedynamic
  • VarHandle (Java 9+)
  • Module API for Reflection

11. Phase 11

  • Stream Pipeline Internals: The internal architecture of stream pipeline internals in Java reveals how the runtime handles Streams & Collectors. This knowledge enables more informed design decisions and debugging.
  • Spliterator & Parallel Splitting
  • Custom Collector Implementation: The custom collector implementation pattern in Java provides a structured approach to handling Streams & Collectors. Understanding the implementation details helps write more robust and maintainable code.

12. Phase 12

  • Gatherer API (Java 22+)
  • Reduction & Mutable Reduction
  • Primitive Stream Optimization

13. Phase 13

  • Ordering & Encounter Order
  • Module Declaration (module-info.java)
  • Exports, Opens & Requires

14. Phase 14

  • Service Loader (provides, uses)
  • Transitive Dependencies
  • Qualified Exports

15. Phase 15

  • Module Layers & Configuration
  • Migration Strategies (unnamed, automatic modules)
  • Class File Structure

16. Phase 16

  • Bytecode Instruction Set
  • Stack Frame & Local Variables
  • ASM Framework for Bytecode Manipulation

17. Phase 17

  • Method Inlining & Inline Cache
  • JIT Compilation (C1, C2, Graal)
  • Deoptimization & On-Stack Replacement

18. Phase 18

  • JNI Method Declaration
  • JNI Types & Type Signatures
  • Managing References (Local, Global, Weak)

19. Phase 19

  • Exception Handling in JNI
  • Project Panama (Foreign Memory & Linker)
  • FFM API (MemorySegment, SymbolLookup)

20. Phase 20

  • Callbacks from Native Code
  • JUnit 5 Extension Model
  • Parameterized Tests

21. Phase 21

  • Mocking with Mockito
  • TestContainers Integration
  • AssertJ for Fluent Assertions

22. Phase 22

  • Mutation Testing (Pitest)
  • Benchmarking with JMH
  • JITWatch & JIT Compilation

23. Phase 23

  • String Performance (StringConcatFactory): Performance considerations for string performance (stringconcatfactory) in Java significantly impact application behavior. Understanding optimization strategies helps avoid common pitfalls and improve runtime characteristics.
  • Escape Analysis & Stack Allocation
  • Lock Coarsening & Biased Locking

24. Phase 24

  • GC Log Analysis
  • Flight Recorder (JFR)
  • Method Profiling with async-profiler

25. Phase 25

  • Security Manager (deprecated) & Permissions
  • Cryptography Provider Architecture
  • TLS/SSL in Java

26. Phase 26

  • JAAS Authentication
  • Signed JAR & Code Signing
  • Sealed & Restricted Classes (Java 17)

27. Phase 27

  • Deserialization Vulnerabilities
  • Builder Pattern with Lombok
  • Strategy with Enums & Lambdas

28. Phase 28

  • Visitor Pattern (Accept & Defensive)
  • Factory Method with ServiceLoader
  • Singleton (Enum Idiom)

29. Phase 29

  • Dependency Injection (Guice, Spring)
  • Null Object Pattern with Optional