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Champion

Grzegorz Piwowarek

Owner at 4Comprehension

Grzegorz Piwowarek is an independent trainer and consultant, Java Champion, and Oracle ACE. He is the lead of the Vavr project and the Warsaw Java User Group, and a long-time contributor to the Java ecosystem as a speaker, OSS author, and blogger at 4comprehension.com. There are persistent rumours that he only exists at compile time.

Badges 10

Talks 8

  1. Devoxx Poland 2025

    What Can a Java Developer Learn from Golang?

    June 2025Programming Languages

  2. Voxxed Days Ticino 2025

    What Can a Java Developer Learn from Golang?

    January 2025Backend Development

  3. Devoxx Poland 2022

    Hazelcast 5.2 - What's Next?

    June 2022Architecture

  4. Devoxx Poland 2022

    CompletableFuture and its Quirks

    June 2022java

  5. Devoxx Ukraine 2019

    Purely dysfunctional data structures for java

    November 2019Java Language▶ Watch

  6. Voxxed Days Zurich 2019

    The dark side of java 8 - lessons learned

    March 2019Java Language▶ Watch

  7. Devoxx Belgium 2018

    Functional exception handling in java with vavr

    November 2018Java Language▶ Watch

  8. Devoxx Poland 2018

    A hitchhiker's guide to the functional exception handling in java

    June 2018Java Language▶ Watch