Java Roadmap - simpleprog

simpleprog

Foundations

▸ Thread Lifecycle & States

▸ synchronized Keyword & Intrinsic Locks

▸ java.util.concurrent.locks

Core Concepts

▸ ExecutorService & Thread Pools

▸ CompletableFuture & Async Composition

▸ Volatile & Atomic Variables

Intermediate Skills

▸ ForkJoin Framework

▸ Phaser & CyclicBarrier

▸ JVM Memory Model (JSR 133)

Advanced Topics

▸ Heap Structure: Generations & Regions

▸ Garbage Collection Algorithms

▸ GC Tuning & Ergonomics

Expert Level

▸ Reference Types (Soft, Weak, Phantom)

▸ JVM TI & Attach API

▸ Object Header & Compressed OOPs

Mastery

▸ Finalization, Cleaner & Reference Cleanup

▸ Generic Type System

▸ Type Erasure & Bridge Methods

Ecosystem

▸ Wildcards (? extends, ? super)

▸ PECS (Producer Extends, Consumer Super)

▸ Type Token (Class<T>)

Architecture

▸ Super Type Token Pattern

▸ Reified Generics with JVM Records

▸ Class Object & Class.forName

Optimization

▸ Method/Field Invocation

▸ Dynamic Proxy (java.lang.reflect.Proxy)

▸ Annotation Processing at Runtime

Deployment

▸ MethodHandle & invokedynamic

▸ VarHandle (Java 9+)

▸ Module API for Reflection

Phase 11

▸ Stream Pipeline Internals

▸ Spliterator & Parallel Splitting

▸ Custom Collector Implementation

Phase 12

▸ Gatherer API (Java 22+)

▸ Reduction & Mutable Reduction

▸ Primitive Stream Optimization

Phase 13

▸ Ordering & Encounter Order

▸ Module Declaration (module-info.java)

▸ Exports, Opens & Requires

Phase 14

▸ Service Loader (provides, uses)

▸ Transitive Dependencies

▸ Qualified Exports

Phase 15

▸ Module Layers & Configuration

▸ Migration Strategies (unnamed, automatic modules)

▸ Class File Structure

Phase 16

▸ Bytecode Instruction Set

▸ Stack Frame & Local Variables

▸ ASM Framework for Bytecode Manipulation

Phase 17

▸ Method Inlining & Inline Cache

▸ JIT Compilation (C1, C2, Graal)

▸ Deoptimization & On-Stack Replacement

Phase 18

▸ JNI Method Declaration

▸ JNI Types & Type Signatures

▸ Managing References (Local, Global, Weak)

Phase 19

▸ Exception Handling in JNI

▸ Project Panama (Foreign Memory & Linker)

▸ FFM API (MemorySegment, SymbolLookup)

Phase 20

▸ Callbacks from Native Code

▸ JUnit 5 Extension Model

▸ Parameterized Tests

Phase 21

▸ Mocking with Mockito

▸ TestContainers Integration

▸ AssertJ for Fluent Assertions

Phase 22

▸ Mutation Testing (Pitest)

▸ Benchmarking with JMH

▸ JITWatch & JIT Compilation

Phase 23

▸ String Performance (StringConcatFactory)

▸ Escape Analysis & Stack Allocation

▸ Lock Coarsening & Biased Locking

Phase 24

▸ GC Log Analysis

▸ Flight Recorder (JFR)

▸ Method Profiling with async-profiler

Phase 25

▸ Security Manager (deprecated) & Permissions

▸ Cryptography Provider Architecture

▸ TLS/SSL in Java

Phase 26

▸ JAAS Authentication

▸ Signed JAR & Code Signing

▸ Sealed & Restricted Classes (Java 17)

Phase 27

▸ Deserialization Vulnerabilities

▸ Builder Pattern with Lombok

▸ Strategy with Enums & Lambdas

Phase 28

▸ Visitor Pattern (Accept & Defensive)

▸ Factory Method with ServiceLoader

▸ Singleton (Enum Idiom)

Phase 29

▸ Dependency Injection (Guice, Spring)

▸ Null Object Pattern with Optional

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