May 2020
Beginner
267 pages
7h 37m
English
Content preview from 97 Things Every Java Programmer Should Know
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Chapter 4. Be Aware of Your Container Surroundings
David Delabassee
There is a danger to containerizing legacy Java applications as is, with their legacy Java Virtual Machine (JVM), because the ergonomics of those older JVMs will be fooled when running inside Docker containers.
Containers have become the de facto runtime packaging mechanism. They provide many benefits: a certain level of isolation, improved resource utilization, the ability to deploy applications across different environments, and more. Containers also help reduce the coupling between an application and the underlying platform, as that application can be packaged into a portable container. This technique is sometimes used to modernize legacy applications. In the case of Java, a container embeds a legacy Java application along with its dependencies, including an older version of the JVM used by that application.
The practice of containerizing legacy Java applications with their environments can certainly help keep older applications running on modern, supported infrastructure by decoupling them from older, unsupported infrastructure. But the potential benefits of such a practice come with their own set of risks due to the JVM ergonomics.
JVM ergonomics enables the JVM to tune itself by looking at two key environmental metrics: the number of CPUs and the available memory. With these metrics, the JVM determines important ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.