Category Archives: Programming

BufferedInputStream boosted AGAIN by OpenJDK Contrib | Java Coding | Head Crashing Informatics 65

Posted on 19. November 2022 by Markus Karg

Recently I boosted #BufferedInputStream by contributing to #OpenJDK. There was one case open, in which performance did not excel. Now in my new contribution to OpenJDK, which is contained in #Java 20, I fixed this – so in two thirds … Continue reading →

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You will love this new method: containsHeaderString | #JAX-RS | Head Crashing Informatics 64

Posted on 22. October 2022 by Markus Karg

  One of my first contributions to the upcoming #JakartaREST 4.0 API was just merged (https://github.com/jakartaee/rest/pull/1066), so it is time to demonstrate why you will love `containsHeaderString`! If you like this video, please give it a thumbs up, share it, … Continue reading →

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BufferedInputStream boosted: Another OpenJDK Contrib | Java Coding | Head Crashing Informatics 63

Posted on 15. October 2022 by Markus Karg

Last year I contributed a performance optimization to #OpenJDK that makes I/O operations much faster. Strange but true, with existing code often it did not chime in. The reason is that BufferedInputStream was used in many existing applications, which unfortunately … Continue reading →

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I contributed to JCommander: Multi-Parameter Validation | Java Coding | Head Crashing Informatics 62

Posted on 1. October 2022 by Markus Karg

#JCommander (https://jcommander.org/) is a really cool micro-framework for command-line parsing in #Java ☕. While it has great parameter validation (even extensible), it lacks support for multi-parameter validation. So I simply added it, and since last week it is part of … Continue reading →

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SCARY Performance! – record.hashCode() | Head Crashing Informatics 61

Posted on 17. September 2022 by Markus Karg

`record` is a cool and comfortable keyword in #Java, as it does a lot of things for you. But is the resulting code really FAST? This video reveals SCARY performance! If you like this video, please give it a thumbs … Continue reading →

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OpenJDK-Insider packt aus! | Mein Erfahrungsbericht als Contributor | Head Crashing Informatics 60

Posted on 3. September 2022 by Markus Karg

Schockierend! In diesem exklusiven #Undercover-Tatsachenbericht packe ich schonungslos aus, wie unglaublich schlimm es mir als #JRE-Contributor im #OpenJDK-Team ergangen ist. Die nackte Wahrheit, ungeschminkt und unverblümt! Das definitive MUST-SEE für jeden, der Contributor bei OpenJDK werden möchte! 😉 Bitte nehmt … Continue reading →

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Coding Microservice From Scratch (Part 7 of 7) | JAX-RS Done Right! | Head Crashing Informatics 59

Posted on 20. August 2022 by Markus Karg

Write a pure-Java microservice from scratch, without an application server nor any third party frameworks, tools, or IDE plugins — Just using JDK, Maven and JAX-RS aka Jakarta REST 3.1. This seven part-video series shows you the essential steps! In … Continue reading →

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Coding Microservice From Scratch (Part 6 of 7) | JAX-RS Done Right! | Head Crashing Informatics 58

Posted on 6. August 2022 by Markus Karg

Write a pure-Java microservice from scratch, without an application server nor any third party frameworks, tools, or IDE plugins — Just using JDK, Maven and JAX-RS aka Jakarta REST 3.1. This seven part-video series shows you the essential steps! In … Continue reading →

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Coding Microservice From Scratch (Part 5 of 7) | JAX-RS Done Right! | Head Crashing Informatics 57

Posted on 23. July 2022 by Markus Karg

Write a pure-Java microservice from scratch, without an application server nor any third party frameworks, tools, or IDE plugins — Just using JDK, Maven and JAX-RS aka Jakarta REST 3.1. This seven part-video series shows you the essential steps! Episode … Continue reading →

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Coding Microservice From Scratch (Part 4 of 7) | JAX-RS Done Right! | Head Crashing Informatics 56

Posted on 9. July 2022 by Markus Karg

Write a pure-Java microservice from scratch, without an application server nor any third party frameworks, tools, or IDE plugins — Just using JDK, Maven and JAX-RS aka Jakarta REST 3.1. This seven part-video series shows you the essential steps! In … Continue reading →

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