Although there are a lot of JVM-related materials on the market, it is obviously difficult for everyone to learn systematically. At the same time, JVM knowledge is now a compulsory subject for technical interviews with first-tier manufacturers.
Senior Java technical experts who have worked in large factories for more than 10 years have comprehensively sorted out the knowledge and experience of systematically learning JVM, from entry to obsession, as well as advanced advanced methods and actual combat such as in-depth analysis of common interview questions ! It not only meets the needs of rapid and systematic learning and comprehensive knowledge acquisition, but also takes into account interview experience counseling.
Let's take a look at the contents of the notes:
- Getting Started with JVM ( Introduction to JVM + JDK + JRE + Class )
- What should the JVM learn ( parental delegation + heap + stack + class loading mechanism + runtime data area + JVM memory model + GC garbage collection + garbage collection algorithm )
- If you want to do a good job, you must first sharpen your tools ( JVM parameters + common commands + common tools + execution engine )
- Performance optimization ( memory leak + memory overflow + new generation + old generation + G1 tuning + CMS + full gc )
Getting started with the JVM
- What is Java?
- Programming language
- A language that a computer [hardware] can understand
- operating system
- So what is JVM?
- JDK JRE JVM
What exactly should the JVM learn
- source code to class files
- source demo
- Class file
- Load
- link
- Initialize
- Class Loader ClassLoader
- parent delegation
- Class files to virtual machine (closed loading mechanism)
- Run-Time Data Areas
- Method Area
- Heap
- Java Virtual Machine Stacks
- The pc Register (program counter)
- Native Method Stacks
- JVM memory model
- heap overflow
- Method area memory overflow
- virtual machine stack
- Garbage Collect (garbage collection)
- garbage collection algorithm
- Generational Collection Algorithm
- garbage collector
If a worker wants to do a good job, he must first sharpen his tools
- JVM parameters
- view parameters
- Common ways of setting parameters
- Practice and Unit Conversions
- Meaning of Common Parameters
- Common commands (jps+jinfo+jstat+jstack+jmap)
- Common tools (jconsole+jvisualvm+arthas)
- memory analysis
- MAT
- GC log analysis
- execution engine
- explain execution
- just-in-time compiler
- AOT and Graal VM
- Recognition of JVM
JVM performance optimization
- memory allocation
- Out of Memory (OOM)
- High concurrency spike
- Memory leaks lead to memory overflow
- GC
- When to use G1
- G1 Tuning Best Practice
- High CPU usage
- JVM performance optimization guide
- common problem
List
Now interviewing for Java positions, no matter what size of company, the general interviewer will ask JVM-related questions face-to-face, what thread, memory model, JVM runtime memory, garbage collection and algorithm, GC garbage collector, JAVA IO /NIO, JVM class loading mechanism and other knowledge points.
If the answer is not good, it will even affect the salary.
Therefore, understanding the JVM is an indispensable part of in-depth learning of Java, and it is also a step for Java developers to move to a higher level. I believe that the above document can help you overcome obstacles on the road of JVM learning!