Articles Tagged ‘docker’

Testing Java Applications for Resilience by Simulating Network Problems with Toxiproxy, JUnit and the Docker Maven Plugin

Sunday, July 29th, 2018

When implementing distributed systems, client-server architectures and simple applications with network related functionalities, everything is fine when we’re in the development or in the testing stage because the network is reliable and the communicating systems are not as stressed as they are in production.

But to sleep well we want to validate how resilient we have implemented our systems, how they behave when the network fails, the latency rises, the bandwidth is limited, connections time out and so on.

In the following tutorial I will demonstrate how to set up a testing environment to simulate different classical network problems with a tool named Toxiproxy and I will show how to integrate it with the well known Java testing stack with Maven and JUnit.


Setting up Kafka Brokers for Testing with Kafka-Unit

Wednesday, March 28th, 2018

When writing test for applications that interact with Kafka brokers we often need to setup a decent environment including an instance of Kafka and ZooKeeper.

Though Kafka ships with some classes for testing, setting up a simple testing environment is quite easier with the kafka-unit library that offers JUnit test rule support or a fast programmatic setup within no time.

In the following short example, I’d like to show how create a simple setup using Maven, Surefire and kafka-unit. (more…)

Identity Management, One-Time-Passwords and Two-Factor-Auth with Spring Boot and Keycloak

Sunday, November 26th, 2017

Communicating with  identity and access management systems is a common task for many web-applications exposing secured resources.

Keycloak is an open source software that provides not also such authorization services but also offers a lot of features from Single-Sign-On, Identity-Brokering, Social-Login, User-Federation, multiple client-adapters up to the administration console or support for protocols like OpenID, SAML, OAuth2, Kerberos and more.

I will demonstrate how to integrate a Spring Boot web application with Keycloak and configure an authentication flow that requires a two-factor-authentication with user credentials and also one-time-passwords. (more…)

Continuous Delivery with Bitbucket Cloud and Bitbucket Pipelines

Friday, July 1st, 2016

Atlassian has added a continuous integration service as a new feature to their Bitbucket Cloud product. It’s called Bitbucket Pipelines and it is similar to Travis CI for GitHub offering a nice integration for continuous integration/delivery pipelines for projects hosted on Bitbucket.

It’s still in the beta phase and requires a sign-up but nevertheless I’d like to demonstrate the current state of this service and how easy it is to add scripted pipelines to a project.