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This month I took a look at the latest techniques used to build Java agents, by focusing on talks and articles by Rafael Winterhalter, the author of ByteBuddy - a tool that helps you dynamically adjust Java code.

What's most interesting is how simple and straightforward the basic implementation of a Java simple agent is. If you want to try it, you can be up and running with your own agent implementation in minutes! Though as the article about using invokedynamic shows (see below), it can get very complex if you want to implement a sophisticated full featured Java agent. (I currently work on the Elastic APM Java Agent which is a sophisticated fully featured agent that obviously I'm happy to recommend - and the source code is fully available).

Now on to all the usual newsletter list of links, tips, tools, news and articles including those ByteBuddy focused ones, and as usual I've extracted all the tips into this month's tips page including the Java agent tips

A note from this newsletter's sponsor

News

Java performance tuning related news

• "Arthas: Inside Alibaba's Java Diagnostic Tool"
• Explaining how to construct an efficient indexed linked list
• Introducing Prodfiler, the world's first whole-system multi-language continuous profiling platform that does not require recompilation, on-host debug symbols, or service restarts

Tools

Java performance tuning related tools

• JVM eBPF based profiling tool on linux
• An efficient LinkedList - an indexed, heuristic doubly-linked list
• Prodfiler - a BPF based profiler that works understands Java stacks

Articles

• The definitive guide to Java agents (Rafael Winterhalter/Devoxx)
• Embracing invokedynamic to tame class loaders in Java agents (Felix Barnsteiner, Rafael Winterhalter/Elastic)
• An Introduction to JVM Performance (Rafael Winterhalter/GOTO)

Jack Shirazi

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