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    Become a Jave GC Expert Series 2 : How to Monitor Java Garbage Collection

    Written by Sangmin Lee on 06/01/2017 This is the second article in the series of "Become a Java GC Expert". In the first issue Understanding Java Garbage Collection we have learned about the processes for different GC algorithms, about how GC works, what Young and Old Generation is, what you should know about the 5 types of GC in the new JDK 7, and what the performance implications are for each of these GC types. In this article, I will explain how JVM is actually running Garbage Collection in the real time. What is GC Monitoring?  Garbage Collection Monitoring refers to the process of figuring out how JVM is running GC. For example, we can find out: when an object in young has moved to old and by how much, or when stop-the-world has occurred and for how long. GC monitoring is carried out t...
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  2. Become a Jave GC Expert Series 1 : Understanding Java Garbage Collection

    Written by Sangmin Lee on 05/31/2017 What are the benefits of knowing how garbage collection (GC) works in Java? Satisfying the intellectual curiosity as a software engineer would be a valid cause, but also, understanding how GC works can help you write much better Java applications. This is a very personal and subjective opinion of mine, but I believe that a person well versed in GC tends to be a better Java developer. If you are interested in the GC process, that means you have experience in developing applications of certain size. If you have thought carefully about choosing the right GC algorithm, that means you completely understand the features of the application you have developed. Of course, this may not be common standards for a good developer. However, few would object when I say ...
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  3. Understanding JVM Internals

    Written by Se Hoon Park on 05/30/2017 Every developer who uses Java knows that Java bytecode runs in a JRE (Java Runtime Environment). The most important element of the JRE is Java Virtual Machine (JVM), which analyzes and executes Java byte code. Java developers do not need to know how JVM works. So many great applications and libraries have already been developed without developers understanding JVM deeply. However, if you understand JVM, you will understand Java more, and will be able to solve the problems which seem to be so simple but unsolvable. Thus, in this article I will explain how JVM works, its structure, how it executes Java bytecode, the order of execution, examples of common mistakes and their solutions, as well as the features in Java SE 7 Edition.   Virtual Machine The JRE ...
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