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Scala
Spark Streaming Example – How to Stream from Slack
Let’s write a Spark Streaming example in Scala, which streams from Slack. This post will show how to write, configure…
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Software Development
Spark Data Source API: Extending Our Spark SQL Query Engine
In my last post, Apache Spark as a Distributed SQL Engine, we explained how we could use SQL to query…
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Enterprise Java
Introducing The Delegate Pattern
Delegate: a person who is chosen or elected to vote or act for others – Merriam-Webster. Delegate pattern: In software engineering,…
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Core Java
Improve Your JUnit Experience with this Annotation
JUnit is probably part of 90% of all Java projects. And the exciting thing is, we’ll soon have JUnit 5…
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Enterprise Java
Keycloak SSO Integration into jBPM and Drools Workbench
Introduction Single Sign On (SSO) and related token exchange mechanisms are becoming the most common scenario for the authentication and…
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DevOps
Java Remote Debug for Applications Running in Kubernetes
Kubernetes 1.2 was just released and is quickly becooming the defacto cluster management solution for containers (Docker, Rocket, Hyper, etc).…
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Software Development
Logging Requests to Elasticsearch
This is something I wanted to write down for years but never got down to completing the post. It can…
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Software Development
Micro-services for performance
Overview Microservices is a buzz word at the moment. Is it really something original or based on established best practices.…
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Groovy
Building GORM Criteria Queries Dynamically
I originally wrote most of the queries in the spring-security-ui plugin using HQL because I find it more intuitive than…
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