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Garbage Collection Logging Options
This section describes HotSpot JVM options to generate garbage collection log messages. '-XX:+PrintGCDetails' and '-XX:+PrintGCDateStamps' are two most important options. 2025-12-31, ∼462🔥, 1💬

Java Exception: "java.lang.OutOfMemoryError: Java heap space"
This section provides a tutorial example on how JVM expands the Heap space to allocate more objects and leads to the 'java.lang.OutOfMemoryError: Java heap space' Java exception, if it is not allowed to expand any more. 2025-12-31, ∼972🔥, 1💬

Java 8 GC Tutorials - Herong's Tutorial Examples
This book is a collection of tutorial notes and sample codes written by the author while he was learning JVM GC (Garbage Collection) processes. Topics include Java Garbage Collectors, STW (Stop-The-World), Serial Collector, Parallel Collector, Concurrent Collector, G1 Collector, GC Algorithms, Gener... 2025-12-31, ∼2594🔥, 2💬

💬 2019-09-07 Venmo: Very helpful. Thanks!

What Is JVM Stack?
This section describes what are JVM stacks. One stack is created for each thread to hold frames which store local variables, partial results of currently executing nested methods. 2025-04-08, ∼2422🔥, 2💬

💬 2022-05-26 Abdurauf from Uzbekistan: good tutorial to learn thread area

archived: Download and Install JDK 14 on macOS
This section provides a tutorial example on how to download and install the latest version JDK, which contains the HotSpot JVM, on a macOS system. A simple Java program was entered, compiled, and executed to verify the JDK installation. 2024-03-12, ∼322🔥, 0💬

Download and Install JDK on macOS
This section provides a tutorial example on how to download and install the latest version JDK, which contains the HotSpot JVM, on a macOS system. A simple Java program was entered, compiled, and executed to verify the JDK installation. 2023-09-09, ≈97🔥, 61💬

💬 2023-09-09 Anthony: great

💬 2023-05-13 james: oki

💬 2022-01-10 G.S.S.VARAPRASADRAO: cool

💬 2021-11-15 thang: that geart

💬 2021-06-08 anil: thanks

(More comments ...)

PC Register and Native Method Stack
This section describes PC Registers and Native Method Stacks, which are reserved one per thread. Normal Java applications do not have any significant impact on PC Registers and Native Method Stacks. 2023-07-15, ∼3187🔥, 4💬

💬 2023-07-15 Makhdoom: Great info.

Archived: Download and Install JDK 1.7.0 on Windows
This section provides a tutorial example on how to download and install JDK 1.7.0 (Java SE 7) on a Windows XP system. A simple Java program was entered, compiled, and executed with the new JDK installation. 2023-06-24, ∼9206🔥, 14💬

💬 2023-06-24 nelson: thanks

💬 2020-04-28 eeeee: thanks

💬 2017-01-02 sudhanshu: no comments

💬 2016-12-17 tangxy: thk, i just want to learn java

💬 2016-11-22 ankit: THANKS

"-Xint" - Running in Interpreted-Only Mode
This section provides a tutorial example on how to run benchmark tests in interpreted-only mode using the '-Xint' JVM option. 2022-12-10, ∼1098🔥, 1💬

Downloading and Installing JRockit R28.2.7
This section provides a tutorial example on how to download and install Oracle JRockit 6 R28.2.7 on Windows systems. 2022-12-10, ∼7022🔥, 3💬

💬 2018-10-11 cxtr: tanks good

Array Class Introspection
This section provides a tutorial example on how to reflect arrays as classes and introspect its properties like superclass, element type, etc. 2022-12-10, ∼376🔥, 1💬

"-XX:NewRatio" - Ratio of Tenured and "new" Generation
This section describes the default 'new' ratio (size ratio of tenured vs. 'new' generation). 2022-11-09, ∼1764🔥, 1💬

💬 2022-11-09 djs: Thank you for this great explanation :)

Shutting Down or Terminating the JVM Instance
This section provides a tutorial example on how to shutdown or terminate the JVM instance using exit() or halt() method. 2022-10-01, ∼2600🔥, 0💬

"-XX:ParallelGCThreads" - # of Threads
This section describes how to use the '-XX:ParallelGCThreads' JVM option to control the number threads to be used by the Parallel Collector. 2022-10-01, ∼2164🔥, 0💬

"-XX:SurvivorRatio" - Ratio of Eden and Survivor Space
This section describes the default 'new' ratio (size ratio of tenured vs. 'new' generation). 2022-10-01, ∼1937🔥, 0💬

"-XX:+PrintCompilation" - Watching JIT Compilation Logs
This section provides a tutorial example on how to use the HotSpot JVM command option, -XX:+PrintCompilation, to watch JIT compilation logs. The JIT compilation of the test method to native machine code does reduce the execution by 25%. 2022-10-01, ∼1612🔥, 0💬

What Is HotSpot JVM
This section describes what is HotSpot - A Java Virtual Machine (JVM) originally developed by Sun Microsystems and now supported by Oracle Corporation. 2022-10-01, ∼1516🔥, 0💬

The Z Garbage Collector (ZGC) - "+XX:+UseZGC"
This chapter provides tutorial notes and example codes on the Garbage First (ZGC) Collector specified by the '+XX:+UseZGC' JVM option. Topics include introduction the ZGC Collector; ZGC log message format; Stop-The-World behavior of ZGC Collector. 2022-10-01, ∼1406🔥, 0💬

loadClass() Method - Loading Classes Explicitly
This section provides a tutorial example on how to load classes into JVM in 3 ways: loadClass() method, Class.forName() method, and 'new' operator. 2022-10-01, ∼1317🔥, 0💬

"-XX:CMSInitiatingOccupancyFraction=20" - Initiate CMS
This section demonstrates that the '-XX:+UseCMSInitiatingOccupanc yOnly'and '-XX:CMSInitiatingOccupancyFra ction=20'JVM options can initiate CMS collector when Tenured generation occupancy reaches 20%. 2022-10-01, ∼1313🔥, 0💬

Install OpenJ9 JVM with OpenJDK on CentOS Systems
This section provides a tutorial example on how to download and install a binary combination of different OpenJDK and OpenJ9 JVM releases for CentOS systems. 2022-10-01, ∼1289🔥, 0💬

Parallel Collector Adaptive Size Policy
This section describes the Adaptive Size Policy supported by the Parallel Collector to dynamically change heap generation sizes to latency, throughput and footprint goals sequentially. 2022-10-01, ∼1287🔥, 0💬

"-XX:+PrintTenuringDistribution" - Tunuring Distribution
This section describes the garbage collection logging option, '-XX:+PrintTenuringDistributio n',which prints the tenuring distribution of objects in the survivor space after each Minor GC. 2022-10-01, ∼1255🔥, 0💬

Young Generation Collectors - Serial, PS, ParNew, G1
This section describes Garbage Collectors used for the Young generation: Serial, Parallel Scavenge (PS), Parallel New (ParNew), and Garbage First (G1). 2022-10-01, ∼1245🔥, 0💬

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Android ASP Astrology Big5 Bitcoin Blowfish Built-in C# Calendar CD-DVD Cheminformatics Chinese Cryptography DES Email Encoding Ethereum Flash GB2312 General H Herong History HTML Java JavaScript JDBC JSP JVM Linux Molecule Movie Music MySQL Neural Network Perl PHP Physics PKI Publication Python REST SOAP Sorting Swing TV Series UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO