Memory Management And Garbage Collection

This section provides an overview of Java's memory management, focusing on garbage collection, object allocation, and performance optimization.

Java Memory Model Overview

The Java Memory Model describes how memory is organized and managed in Java applications, focusing on key memory areas managed by the JVM.

Key Memory Areas

Java memory management is divided into distinct areas, each with specific roles in application execution.

Object Allocation In Java

In Java, objects are allocated on the heap using the new keyword, emphasizing efficient memory usage.

Understanding Garbage Collection (Gc)

This section explains the concept of garbage collection in Java, its importance in memory management, and the processes involved.

What Is Garbage Collection?

Garbage Collection (GC) in Java is an automatic process that identifies and frees memory used by objects that are no longer reachable in an application.

Why Use Garbage Collection?

Garbage Collection in Java automates memory management, preventing memory leaks and enhancing application performance.

How Garbage Collection Works

Garbage collection in Java is an automated process that identifies and reclaims memory used by unreachable objects in order to manage memory efficiently.

Mark And Sweep Algorithm

The Mark and Sweep Algorithm is a garbage collection method in Java that identifies and reclaims memory occupied by unreachable objects.

Reachability Analysis

Reachability analysis determines which objects in memory are accessible and therefore still in use, identifying those that are eligible for garbage collection.

Types Of Garbage Collectors In Java

This section describes various types of garbage collectors available in Java, each tailored for different application needs.

Serial Garbage Collector

The Serial Garbage Collector uses a single thread suitable for small applications, simplifying memory management in Java.

Parallel Garbage Collector (Throughput Gc)

The Parallel Garbage Collector, or Throughput GC, enhances Java's memory management by utilizing multiple threads for garbage collection, making it suitable for multi-threaded applications.

Cms (Concurrent Mark-Sweep) Collector

The CMS Collector minimizes application pauses by performing garbage collection concurrently.

G1 (Garbage First) Collector

The G1 Garbage Collector is designed for large heaps in Java, balancing pause time and throughput by breaking the heap into regions.

Z Garbage Collector (Zgc) And Shenandoah

ZGC and Shenandoah are low-latency garbage collectors in Java, introduced in Java 11, designed for applications requiring ultra-low pause times.

Jvm Heap Structure

The JVM heap structure is divided into generations that manage memory allocation for Java applications.

Young Generation

The Young Generation in Java. This area is where new objects are allocated, and it's subject to frequent garbage collection.

Old (Tenured) Generation

The Old Generation in Java memory management stores long-lived objects and is subject to less frequent but more complex garbage collection processes.

Permanent Generation / Metaspace

This section discusses the Permanent Generation and its replacement, Metaspace, emphasizing the storage of class metadata in Java.

Finalization And Method

The finalize() method in Java is used for cleanup actions before an object's memory is reclaimed by the Garbage Collector, though it has been deprecated since Java 9.

Memory Leaks In Java

Memory leaks in Java occur when references are unintentionally held, leading to inefficient memory usage despite the presence of garbage collection.

Monitoring And Tuning Garbage Collection

This section covers the tools and options available to monitor and tune Java's garbage collection process.

Jvm Tools

This section introduces various tools used to monitor and tune garbage collection in the Java Virtual Machine (JVM).

Jvm Options For Gc Tuning

This section introduces various JVM options for tuning garbage collection to optimize memory management in Java applications.

Best Practices For Efficient Memory Management

This section outlines best practices for managing memory effectively in Java applications.