Java, Kotlin and the JVM
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Java, Kotlin, Gradle, Maven, JDKs, Spring and the whole JVM ecosystem tips & tricks. 🇪🇸 & 🇬🇧
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Java 23 will support Primitive Types in Patterns, instanceof, and switch as a preview feature. Preview features are a way of gathering feedback about the future of the language. If you are using pattern matching on boxes types take the time to test this preview feature.

https://openjdk.org/jeps/455

#java #openjdk #jep
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Support nullness markers on Java types to indicate that a type rejects or deliberately allows nulls. This is a preview language feature.


https://bugs.openjdk.org/browse/JDK-8303099

#java #openjdk #jep
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https://quarkus.io/blog/quarkus-and-leyden/

#java #quarkus #leyden

Leyden is not a replacement for GraalVM native images but rather a substantial evolution of the JVM, and we expect it to bring some benefits to native images as well.
Old but still interesting article on how unused topics (even if it is empty) impacts the Kafka cluster

we need to understand how unused topics can cause pressure on Kafka. Like many other storage systems, all Kafka topics have a retention period, meaning that for any unused topics, the data will be purged after a period of time and the topic will become empty. A common question here is, “How could empty topics affect Kafka?”


#kafka

https://engineering.linkedin.com/content/engineering/en-us/blog/2022/topicgc_how-linkedin-cleans-up-unused-metadata-for-its-kafka-clu
There are several ways of keeping a cache up to date, lately CDC tools like Debezium has become trendy, and I liked this presentation where they combine Debezium, Infinispan, and Quarkus. They also shared code you can check and run.

📹https://www.youtube.com/watch?v=zOOFMHAjoPI
💻https://github.com/debezium/debezium-examples/tree/main/distributed-caching
Intresting article on how to write a language analyzer in #java

They have wrriten a Lua analyzer using ANTLR v4, they describe main components of a language parser and they implement the actual code. Really interesting.



https://dev.to/anogneva/how-to-develop-code-analyzer-in-48-hours-9ap
This blog post shows in a success story of Intersport how some use cases store data long term in Kafka with no other database. The retailer requires accurate stock info across the supply chain, including the point of sale (POS) in all international stores

https://kai-waehner.medium.com/how-the-retailer-intersport-uses-apache-kafka-as-database-with-compacted-topic-21ef67d854ac
Nice comparation of #JVM GC with other runtime by ByteByteGo
Kopy #Kotlin K2 Plugin Compailer.

Nested copies made easy in Kotlin

https://github.com/JavierSegoviaCordoba/kopy
Pinterest implementation of Tired Storage for #Kafka

With 20+ production topics onboarded since May 2024, our broker-decoupled Tiered Storage implementation currently offloads ~200 TB of data every day from broker disk to a cheaper object storage. In this blog, we share the approach we took and the learnings we gained.


https://medium.com/pinterest-engineering/pinterest-tiered-storage-for-apache-kafka-%EF%B8%8F-a-broker-decoupled-approach-c33c69e9958b
The recent JDK release, JDK 23, completely removes the COMPAT database that Elasticseach is currently using, leaving CLDR as the only option for locale data. This means we are forced to change the locale database used by Elasticsearch running on JDK 23 and above when we upgrade to use JDK 23.


Important note about running #ElasticSearch in #JDK23. It also impacts you if you are using locale from jdk internal tables
Java is used on embedded platforms for in-car infotainment and information displays, home automation and production environment edge gateways, medical devices, appliances, and the list goes on.


https://foojay.io/today/a-fresh-look-at-embedded-java/