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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. 2023-05-19, 91545👍, 60💬

💬 2023-05-13 james: oki

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

💬 2021-11-15 thang: that geart

💬 2021-06-08 anil: thanks

💬 2021-01-01 MOH: WERE CLICK TO DOWNLOAD

(More comments ...)

"-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, 448👍, 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, 6456👍, 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, 142👍, 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, 775👍, 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, 1365👍, 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, 1014👍, 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, 953👍, 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, 686👍, 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, 645👍, 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, 643👍, 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, 615👍, 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, 609👍, 0💬

Class Loading Problem - JAR Hell
This section provides a tutorial example on how to use ClassLoader.getSystemResources ()method to return all locations of the same class file. This is useful when you are dealing with JAR hell problem. 2022-10-01, 602👍, 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, 602👍, 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, 567👍, 0💬

"-XX:TargetSurvivorRatio" - Second Tenuring Condition
This section describes the '-XX:TargetSurvivorRatio' JVM option, with sets the maximum survivor space usage percentage. When this limit is reached, all remaining live objects will be promoted to Tenured generation regardless of their age. 2022-10-01, 515👍, 0💬

"-XX:ConcGCThreads=3" - Old GC Concurrent Threads
This section demonstrates that the '-XX:ConcGCThreads=3' option can be used to control the number of threads used in 1 of the CMS concurrent phases: Mark phase. 2022-10-01, 505👍, 0💬

Parallel Collector - "+XX:+UseParallelGC"
This chapter provides tutorial notes and example codes on the Parallel Collector specified by the '+XX:+UseParallelGC' JVM option. Topics include introduction to Parallel Collector log message format; multiple parallel GC threads; '-XX:+UseAdaptiveSizePolicy' option to dynamically changing 'eden', '... 2022-10-01, 499👍, 0💬

"-Xlog:gc+heap=trace" - GC+HEAP Log Messages
This section describes the garbage collection logging option, '-Xlog:gc+heap=trace', which prints two snapshots of the heap of each GC, one before the GC and another after the GC. It also prints heap changes of each GC. 2022-10-01, 492👍, 0💬

Concurrent Mark-Sweep (CMS) Collector - "+XX:+UseConcMarkSweepGC"
This chapter provides tutorial notes and example codes on the Concurrent Mark-Sweep Collector specified by the '+XX:+UseConcMarkSweepGC' JVM option. Topics include introduction to Concurrent Mark-Sweep (CMS) Collector; CMS Collector log message format; demonstration of reduction of stop-the-world by... 2022-10-01, 480👍, 0💬

getSystemResource() Method - Finding Files
This section provides a tutorial example on how to find resource files using the ClassLoader.getSystemResource( )method. A resource file can an image file, a class file, or any file. 2022-10-01, 478👍, 0💬

"-XX:+PrintFlagsFinal" - Print JVM Options
This section describes the '-XX:+PrintFlagsFinal' JVM option, which prints all options and their values used by the JVM. 2022-10-01, 474👍, 0💬

"-Xlog:gc+ergo=trace" - Minor GC Report
This section provides examples of log messages generated from '--Xlog:gc+ergo=trace' that tells us what happened at each Parallel Minor GC. 2022-10-01, 469👍, 0💬

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Android ASP Astrology Bitcoin Blowfish Built-in C# Calendar CD-DVD Chinese Cryptography DES 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 Reference REST SOAP Sorting Swing TV Series UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO