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JVM Runtime Data Areas
This chapter provides tutorial notes and example codes on JVM runtime data areas. Topics include introduction of JVM runtime data areas: Method Area, Heap, Direct Memory, PC Registers, JVM Stacks, and Native Method Stacks; different between thread-shared and per-thread data areas; demonstration prog...
2018-07-01, 395🔥, 0💬

Garbage Collection Logging Options
This section describes HotSpot JVM options to generate garbage collection log messages. '-Xlog:gc', '-Xlog:gc*=debug', '-Xlog:gc*=debug:file' are very useful options.
2018-06-24, 2752🔥, 1💬

💬 2018-06-24 Tina: This is useful.

💬 2018-04-23 Don: Thanks for the detailed explanation!

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.
2018-06-24, 805🔥, 1💬

💬 2018-06-24 Maria: Cool!

💬 2017-08-10 xionghongzhi: awsome artical!!!!!! thx!!!

"-XX:+PrintGCDetails" - Garbage Collection Logging
This section describes HotSpot JVM options to generate garbage collection logging messages. It also describes log message format to help us understand what the JVM is telling us.
2018-04-23, 2412🔥, 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.
2017-08-10, 473🔥, 1💬

Current Time in Milliseconds and Nanoseconds
This section provides a tutorial example on how to obtain the current time in milliseconds and nanoseconds using currentTimeMillis() and nanoTime() methods.
2017-08-09, 721🔥, 1💬

What Is Runtime?
This section describes what is Runtime - A Java built-in class, java.lang.Runtime, that presents running instances of a Java Virtual Machine (JVM).
2017-04-28, 904🔥, 2💬

💬 2017-04-28 micahel: useful

What Are Runtime Data Areas?
This section describes 6 JVM runtime data areas: Method Area, Heap, Direct Memory, PC Register, JVM Stack and Native Method Stack.
2017-04-10, 545🔥, 1💬

Accessing System Environment Variables
This section provides a tutorial example on how to access environment variables defined in the operating system using the System.getenv() method.
2017-01-14, 848🔥, 2💬

💬 2017-01-14 Herong: Martin, The code has been corrected now. Thanks.

💬 2017-01-09 Martin Manek: Hi, line "java.util.Map envs = System.getenv();" is two times in code and "out is missing. PrintStream out = System.out;

Java HotSpot VM - JVM by Oracle/Sun
This chapter provides tutorial notes and example codes on Java HotSpot VM. Topics include running Java HotSpot VM in client and server modes; checking memory usage with the Runtime class.
2016-01-26, 2119🔥, 1💬

💬 2016-01-26 Mangkorn: Thanks

Garbage Collection Tests
This chapter provides tutorial notes and example codes on garbage collection. Topics include garbage collection test program - GCTest2.java; comparisons between HotSpot 1.7.0, HotSpot 1.6.0 and JRockit R28.2.7.
2015-08-16, 578🔥, 1💬

Running Java HotSpot Server VM
This section provides you a tutorial example on how to run Java HotSpot Server VM - run Java command with -server option: 'java -server'.
2015-08-04, 1931🔥, 1💬

💬 2015-08-04 anil: i want system to phone net

JVM Tutorials - Herong's Tutorial Examples
This book is a collection of notes and sample codes written by the author while he was learning JVM himself. Topics include JVM (Java Virtual Machine) Architecture and Components; Oracle JVM implementation - HotSpot; Eclipse JVM implementation - Eclipse OpenJ9; java.lang.Runtime - The JVM Instance c...
2015-07-18, 2033🔥, 0💬

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