Spin Up An Apache Spark Cluster: Howto In 5 Minutes

This flash tip aims to provide the reader with the information required for spinning up an Apache Spark cluster
Spring Boot, GraphQL, TestContainers, PostgreSQL: Minimal Setup

This tip provides a minimalistic quickstart code for setting up a module using Spring Boot, GraphQL, PostgreSQL, and TestContainers.
Digging in the Solr code: 5 minutes howto

How to quickly debug a custom Apache Solr component (e.g. request handler, query parser, filter) in your favourite IDE.
The example uses IntelliJ but it is valid for any IDE.