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 video series shows you the essential steps!
You asked me to add dependency injection to our Microservice, so here we go!
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For a third time, I speeded up Plexus-Utils, which is the workhorse underlying #Maven. This time, simply by throwing code away!
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I modified Plexus-Utils, which is the workhorse underlying #Maven, once again. This time, to copy data faster using #Java 11’s NIO APIs.
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I modified Plexus-Utils, which is the workhorse underlying #Maven, to copy data faster using #Java 7’s NIO APIs.
If you like this video, please give it a thumbs up, share it, subscribe to my channel, or become my patreon https://www.patreon.com/mkarg. Thanks! 🙂
Yes, I really did it! My latest contribution to #OpenJDK 21 will make your #Java program drive I/O bytes up to twice as fast through your streams.
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Would you like to see me streaming a #java live coding #letsplay episode? Tell me your opinion in the video comments on Youtube!
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If you are using SequenceInputStream, you will notice that it pulls all data into the JVM’s memory, just to drain it to another I/O sink. This is inefficient and slow. With my latest contribution contained in #OpenJDK 20, this will change dramatically: In the best case, all traffic is routed within the OS, and does not enter the JVM at all.
If you missed the original contribution last year, check my channel page, it is covered by a four-parts series!
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Contributions to #OpenJDK don’t have to be huge always. Sometimes it is the small things that have BIG EFFECT. For example if a class was intended to be non-synchronized (hence: fast), implicitly is synchronized by mistake (hence: slow), is finally getting fixed after 30 years. Just few code lines changed, but multiplied by lots of existing #Java applications using that class, makes a BIG EFFECT in sum!
To get this performance optimization, immediately upgrade to JDK 20!
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As #PushbackInputStream is quite similar to #BufferedInputStream, it was rather easy for me to apply the performance optimizations I already developed for BufferedInputStream to the PushbackInputStream. The contribution was accepted in November 2022, so it is now part of #OpenJDK (aka #Java) 20.
The change will make your application #transferTo bytes faster in case your source or target is a file stream and you wrapped it using a PushbackInputStream. For example, if you read the magic byte of a file to find out about the file type, then push it back and transferTo() the complete content to a specific image processing algorithm, the bytes will not walk through the in-memory buffer anymore, sparing processing time.
If you missed the original contribution last year, check my channel page, it is covered by a four-parts series!
If you like this video, please give it a thumbs up, share it, subscribe to my channel, or become my patreon https://www.patreon.com/mkarg. Thanks! 🙂
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 of all use cases, transferTo() should not stand in the way of I/O offloading anymore!
If you missed the original contribution last year, check my channel page, it is covered by a four-parts series!
If you like this video, please give it a thumbs up, share it, subscribe to my channel, or become my patreon https://www.patreon.com/mkarg. Thanks! 🙂
Head Crashing Informatics 
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