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Tutorial: logging during tests

Logging is a popular solution to show what the software is doing while it is running. But what happens to the logging when we are unit testing our application with jUnit/TestNG ? During the automated tests execution, we are usually not interested to see the logging messages because our main interest is the test results. It would be nice to ...

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10 Awesome Docker Tutorials to Kick-Start your DevOps Projects

Docker is an open-source project that automates the deployment of applications inside software containers, by providing an additional layer of abstraction and automation of operating-system-level virtualization on Linux. Docker uses resource isolation features of the Linux kernel such as cgroups and kernel namespaces to allow independent “containers” to run within a single Linux instance, avoiding the overhead of starting and ...

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Java 8 Streams API: Grouping and Partitioning a Stream

This post shows how you can use the Collectors available in the Streams API to group elements of a stream with groupingBy and partition elements of a stream with partitioningBy. Consider a stream of Employee objects, each with a name, city and number of sales, as shown in the table below: +----------+------------+-----------------+ | Name | City | Number of Sales ...

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Docker Multi-Host Networking with Couchbase and WildFly

Docker Multi-Host networking allows you to create virtual networks and attach containers to them so you can create the network topology that is right for your application. This blog will show how to use it with Docker Compose. CRUD Java Application with Couchbase, Java EE, and WildFly explained how to use a Java EE application to provide a CRUD/REST interface ...

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5 Scala Puzzlers That Will Make Your Brain Hurt

Hunting for non-intuitive cases of exceptions and errors in Scala For this post we got in touch with Nermin Serifovic and Andrew Phillips who you might know from Scala Puzzlers. Together, we’ve selected a few questions to explore errors and exceptions in Scala. Some of the questions might seem weird at first, but it all makes sense when you dig down ...

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7 Slack Integrations Developers Should Use

How to customize Slack to enhance your development workflow using integrations and bots It certainly feels like Slack is gradually becoming the standard for modern office communication. While you may argue that technically Slack is no different than, say, IRC – the polished experience is what makes it stand out in the crowd of messaging services. Using less gentler words, ...

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