book

Java Memory Management

by Maaike van Putten, Dr. Seán Kennedy

November 2022

Intermediate to advanced

146 pages

3h 16m

English

Packt Publishing

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Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesDownload the color imagesConventions usedGet in touchShare Your ThoughtsDownload a Free PDF copy of this book
Technical requirementsUnderstanding computer memory and Java memoryComputer memoryAccessing the main memoryOverview of the main memoryJava memory and the JVMThe JVMMemory management and the JVMMemory management before JavaUnderstanding the JVM’s components for memory managementRuntime data areaCreating variables in JavaPrimitives and reference typesStoring variables on the stackCurrent frame and current methodElements of the frameValues on the stackPrimitives and wrapper classesCreating objects in JavaStoring objects on the heapExploring the MetaspaceSummary
Technical requirementsUnderstanding primitives on the stack and heapStoring objects on the heapReferencesObjectsUnderstanding the differences between references and objectsManaging object references and securityInspecting the escaping references issueSummary
Exploring the different generations on the heapGarbage collection rootsLearning how the spaces are usedUnderstanding the minor garbage collection algorithmDemonstrating the minor garbage collection algorithm in actionSummary
Technical requirementsBeing eligible for GCMarking by the garbage collectorStop-the-worldReference counting and islands of isolationSweeping by the garbage collectorNormal sweepingSweeping with compactingSweeping with copyingExploring GC implementationsGenerational GCSerial GCParallel GCCMS GCG1 GCZ GCMonitoring GCSummary
JVM usage of the MetaspaceClass loadingReleasing Metaspace memoryMetaspace runs out of memoryMetaspace size exceeds a JVM-set thresholdGarbage collection of the MetaspaceSummary
Technical requirementsThe basics of JVM tuning for memory managementObtaining relevant metrics for memory managementWell-functioning memoryNormal latencyLevel of throughputProfiling Java applicationsProfiling with jstat and jmapProfiling with VisualVMTuning the configurations of the JVMTuning the heap size and thread stack sizeLogging low memoryTuning the MetaspaceGarbage collection tuning
Technical requirementsUnderstanding memory leaksSpotting memory leaksHeap memory footprintGarbage collector activityHeap dumpAvoiding memory leaksCommon pitfalls and how to avoid themSummary

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Overview

In "Java Memory Management: A Comprehensive Guide to Garbage Collection and JVM Tuning", you will delve deeply into the structure of Java memory, its management, and how to optimize it for application performance. You will learn about garbage collection, memory profiling, and strategies for avoiding leaks, enhancing both your code quality and system reliability.

What this Book will help me do

Master how Java memory is structured and understand the stack, heap, and Metaspace.
Comprehend the different garbage collection mechanisms in the JVM and their advanced configurations.
Learn best practices for profiling and tuning Java applications for optimal memory usage.
Identify memory leaks and implement solutions to prevent them effectively.
Gain proficiency in JVM tools and techniques for monitoring memory and application performance.

Author(s)

Maaike van Putten is an experienced software developer and trainer with a strong background in Java technologies. Dr. Seán Kennedy holds a doctorate in computer science and specializes in Java performance optimization. Together, they combine hands-on experience and theoretical expertise to deliver a clear and practical guide to Java memory management.

Who is it for?

This book is tailored for Java developers at any expertise level, whether you're just starting in Java development or you're a seasoned practitioner aiming to deepen your understanding. It is also invaluable for DevOps professionals managing Java applications. If you aspire to better understand and optimize Java memory processes, this book is for you.