Java Internals

About

The Java Virtual Machine (JVM) is the execution engine that runs Java applications. It abstracts system details and provides features like memory management, security, and performance optimizations. This section explores its core components and internal workings.

1. JVM Overview

• Key components of JVM and their roles.

• How Java code is converted into bytecode and executed.

2. Memory Management

• How JVM allocates and manages memory (Heap, Stack, Metaspace).

• Garbage Collection mechanisms and optimizations.

3. Class Loading Mechanism

• How classes are loaded, verified, and initialized.

• Role of ClassLoaders and dynamic loading.

4. Execution Engine

• How JVM interprets and compiles bytecode.

• Role of JIT (Just-In-Time) compiler for performance improvements.

5. JVM Runtime Internals

• Variables & Data Handling: How JVM stores and processes variables.

• Exception Handling: Internal working of exception processing and stack unwinding.

• Threading & Synchronization: How JVM manages threads, locks, and concurrency.

6. Java Security

• JVM's built-in security mechanisms like ClassLoader security and cryptography.