I have contributed to a wide range of open-source projects over the last years. Here’s a selection of projects I have been involved with.
Debezium is a platform for change data capture; it lets you stream changes out of different databases such as Postgres, MySQL, MongoDB and SQL Server into Apache Kafka. I am the current lead of the Debezium project.
Quarkus is a "Kubernetes Native Java stack tailored for OpenJDK HotSpot and GraalVM, crafted from the best of breed Java libraries and standards". My contributions to Quarkus are centered around its extension for Kafka Streams, which I initially created.
Bean Validation is a Java specification which lets you express constraints on object models via annotations. Originally developed at the JCP, it’s now part of the Jakarta EE umbrella at the Eclipse foundation. I have been the spec lead for Bean Validation 2.0 (JSR 380) and the lead of the reference implementation Hibernate Validator.
As part of the Hibernate team, I’ve contributed to different projects such as Hibernate OGM (an effort to access NoSQL stores with JPA), Hibernate Search (full-text search for domain models based on Apache Lucene and Elasticsearch) and Hibernate ORM.
MapStruct is a compile-time code generator for bean-to-bean mappings. Based on annotated Java interfaces, MapStruct generates mapping code that it is fully type-safe and very efficient by avoiding any usage of reflection. I was the creator and initial project lead of MapStruct.
ModiTect is a family of Maven and Gradle plug-ins around the Java Module System, e.g. for creating module descriptors and building modular runtime images via jlink. Deptective is a plug-in for the Java compiler (javac) for enforcing package dependencies within Java projects based on a declarative architecture definition.