Facilitating the spread of knowledge and innovation in professional software development



Choose your language

InfoQ Homepage Presentations Living in the Matrix with Bytecode Manipulation

Living in the Matrix with Bytecode Manipulation



Ashley Puls examines three common byte code manipulation frameworks: ASM, CGLib, and Javassist (Java Programming Assistant), showing how these tools work and why frameworks like Spring use them.


Ashley Puls is Software Engineer at New Relic.

About the conference

Pivotal and No Fluff Just Stuff bring you SpringOne 2GX 2014, a one-of-a-kind conference for application developers, solution architects, web operations and IT teams who develop business applications, create multi-device aware web applications, design cloud architectures, and manage high performance infrastructure. The sessions are specifically tailored for developers using the hugely popular open source Spring IO projects, Groovy & Grails, Cloud Foundry, Hadoop and Tomcat technologies. Whether you're building and running mission-critical business applications, designing the next killer cloud or big data application, SpringOne 2GX will keep you up to date with the latest enterprise open source technology.

We need your feedback

How might we improve InfoQ for you

Thank you for being an InfoQ reader.

Each year, we seek feedback from our readers to help us improve InfoQ. Would you mind spending 2 minutes to share your feedback in our short survey? Your feedback will directly help us continually evolve how we support you.

Take the Survey

Recorded at:

Nov 02, 2014

Hello stranger!

You need to Register an InfoQ account or or login to post comments. But there's so much more behind being registered.

Get the most out of the InfoQ experience.

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Community comments

  • MP3 download not working

    by Karl Beauchamps,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    Please fix this.

  • Very good presentation

    by Antoine Schellenberger,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    Humm, very interesting introduction to framework manipulation bytecode in JAVA.
    Even if the topic is not so trivial and common in java world, I found the explanations and examples very clears and simples. It's always a pleasure to understand what goes under the hood (even in JAVA :D).
    Good job Mrs Puls!

  • Re: MP3 download not working

    by Roxana Bacila,

    Your message is awaiting moderation. Thank you for participating in the discussion.

    Hi Karl,
    Thank you for pinging us about the error. This is now solved.

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p


Is your profile up-to-date? Please take a moment to review and update.

Note: If updating/changing your email, a validation request will be sent

Company name:
Company role:
Company size:
You will be sent an email to validate the new email address. This pop-up will close itself in a few moments.