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02: jvisualvm to detect memory leak – a quick tutorial style Java demo

This is a companion post to 8 Java Memory Management Interview Q&A demonstrating a memory leak scenario step by step with jvisualvm, which is a free profiling tool that gets shipped with JDK. Step 1: Code that causes memory leak Here is a sample code that causes memory leak. It

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Posted in jvisualvm profiling, JVM, Memory Management

01: jvisualvm to sample Java heap memory

Java does not have a sizeof operator like C++ does. Java uses automatic memory management known as the Garbage Collection, hence it is not that important to evaluate size of various objects. But, for the purpose of learning & fixing any potential memory issues, I have used “jvisualvm”, which is

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Posted in jvisualvm profiling, JVM, Memory Management

05: Java primitives & objects – memory consumption interview Q&A

Q1. How much memory space does a primitive type int occupy in Java? A1. 4 bytes. Q2. Java objects get stored in the heap memory space, but how about the primitive variables? A2. It depends. 1) Primitives defined locally would be on the stack.

2) If a primitive is…...

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5 JMX and MBean interview questions & answers

Q1. What is a JMX? What are the key components of JMX? A1. JMX stands for Java Management Extensions (JMX), which is a technology to monitor and manage any Java applications are running in either a local or a remote Java Virtual Machine (JVM). 1) MBeanServer, which acts as a…...

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Posted in JMX, JVM, member-paid

06: ♦ 10+ Atomicity, Visibility, and Ordering interview Q&A in Java multi-threading

Q1. Why is it important to understand the difference between the “JVM memory model” and the computer “hardware memory model”? A1. 3 reasons why it is important to understand the JVM memory model and computer hardware memory model are: 1) JVM memory model and the physical hardware memory model architectures…...

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♦ Java Garbage Collection interview questions & answers to ascertain your depth of Java knowledge

Java Garbage Collection interview questions & answers to ascertain your depth of Java knowledge in building industry strength Java applications Q1. In which part of memory does Java collection occur? When does the garbage collection occur? In which thread does the GC run? Why is it knowing about GC is…...

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Posted in GC, JVM, member-paid, Performance
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