Optimising Java

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Course Description

This Optimising Java training course covering JVM internals, bytecode, classloading, garbage collection analysis and tuning as well as JIT compilation, application profiling and language-level techniques; this course also contains hands-on labs and a wealth of directly-applicable knowledge that will allow engineers to gain deep insight into their performance problems and how to fix them.

 

Learning Objectives

•     To diagnose and fix Java application performance problems
•     To understand the underlying architecture of the JVM and some internals
•     To understand the causes of common performance problems
•     To avoid common misconceptions and traps when performance tuning Java applications
•     To gain a basic familiarity with common Java performance tools

 

About the course

Ben Evans is an author of the brand new O’Reilly book of the same name, this 2-day course is designed for intermediate, advanced and expert Java developers who want to learn the detailed how and why of Java performance and how to diagnose and correct performance problems in a systematic and scientific way.

 

Course Set-up

(hardware and software requirements)

•     Java 8 (preferred) or 7
•     A suitable IDE (e.g. Netbeans, Eclipse, IntelliJ)
•     Maven

 

Course Outline

Day 1:

Introduction / Setting the scene

•     An overview of JVM structure and subsystems
•     Objects at runtime

Lab: Introduction to jmap

Benchmarking

•     Why JVM performance analysis is complex
•     Simple system model & simple analysis techniques
•     Tools and system benchmarking
•     Best practices & anti-patterns

Lab: Hands-on introduction to tools

Garbage Collection

•     Review of Hotspot’s heap
•     Basic concepts
•     Parallel collectors
•     CMS
•     G1GC

GC Tuning & Tools

•     Trade-offs between collectors
•     GC Parameters
•     GC Logging
•     GC Tools
•     Choosing a collector

Lab: Spotting GC problems from tools

Day 2:

Language-level performance techniques

•     JIT compilation
•     Overview of JVM bytecode & classloading
•     Understanding JIT compilation
•     PrintCompilation & LogCompilation
•     JITWatch
•     Lab: Hands-on with JITWatch

Profiling (and Microbenchmarking)

•     Large-scale profiling
•     Microbenchmarking caveats
•     JMH

Lab: JMH Hands-on

Language-level performance techniques

•     Java collections
•     Immutable objects
•     Atomic access
•     misc.Unsafe

Lab: Immutable objects

The Future: Java 9 and beyond

– Modules and their impact
– New performance enhancements
– AOTC
– Valhalla, Panama, GPU compute

Learning Path

There are many options of suitable follow-on courses. Here is one suggestion, it’s a new and very interesting hands-on workshop which Ben Evans has developed and launched in 2017:

•     Hands on Security for Java Developers GTIT37

If you cannot find what you are looking for please contact us as we have many other Java courses in our training curriculum.

Ways to Attend

• Attend a public course, if there is one available. Please check our schedule, or register your interest in joining a course in your area.
• Private onsite Team training also available, please contact us to discuss. We can customise this course to suit your business requirements.