Practical Debugging at Scale: JMX & jmxterm - P. 20 | DebugAgent.com

The ability to log into production and take a look under the hood is a powerful tool. There are many tools that allow us to do that and some of them are subtle. JMX is a tool that's available everywhere, we often use it for system administration but it's very useful for debugging and insight. We can use JMXTerm to control it from command line and understand the underlying functionality.

This video is a part of the third module covering debugging tools. Is your debugging session limited to the IDE? What do you do when there's a dead end or the problem only happens in the release version of your application? That's where external tooling can take you to the next level as a developer.

By leveraging these tools and techniques you will gain access to the secret weapon of senior developers and consultants. This will make you a better developer and a happier one. Stop treating debugging like throwing out the garbage and treat it as a skill that you should improve.

In the following modules we cover:

* Debugging Theory - Ever spent all night on a bug only to find out it was a "stupid" thing that you missed in the beginning? We all have! There's a systematic process for tracking an issue that reduces the chance of this recurring.

* Code - This isn't a course on coding. You should know how to do that before you start. But how do you write code that's easier to debug? Code that fails in predictable ways. Code whose failures are easy to understand and track. Code that doesn't drain your bank account because it overuses cloud resources.

* Kubernetes - Not only is Kubernetes hostile to debugging, it does that on a scale that creates its own set of problems. Add the complexity of production debugging to the mix and we've got a new set of problems.

* Serverless - Kubernetes has an ephemeral state problem, serverless takes that problem to a completely new level.

* Fullstack - As we chase a bug we need to venture outside our comfort zone. To tiers and tools we might not be as comfortable with. In this module we'll discuss debugging the frontend and the database to create a tongs motion around the bug.

* Observability - Production debugging is really about observability. Yet so many of us leave these tools to the DevOps team. In this module we'll cover these tools from a developer perspective.

The full course includes more than 5 hours of video material.

00:00 Introduction
00:12 Debugging Using a Tong Motion
00:48 Operations vs. Developers
01:39 Java Management Extensions (JMX)
02:39 How does JMX Work?
03:56 Spring Actuator
04:51 jmxterm
05:17 Basic Usage
05:51 Domains
06:31 beans
06:55 info
07:19 Logger Level
08:12 Tip of the Iceberg
08:50 Final Word