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Why do we mock?

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I do Java interviews. During the interviews I ask technical question that I know the answer for. You may think this is boring. To be honest: sometimes it is. But sometimes it is interesting to learn what misconcepts there are. I happened to ask during the interview what you can read in the title: “Why do we mock?”. The answer ...

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Pushing Docker images to Registry

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Tech Tip #57 explained how to create your own Docker images. That particular blog specifically showed how to build your own WildFly Docker images on CentOS and Ubuntu. Now you are ready to share your images with rest of the world. That’s where Docker Hub comes in handy. Docker Hub is the “distribution component” of Docker, or a place to store and search images. From the Getting ...

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Remove Docker image and container with a criteria

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You have installed multiple Docker images and would like to clean them up using rmi command. So, you list all the images as:                 ~> docker images --no-trunc REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE mysql latest 98840bbb442c7dc3640ffe3a8ec45d3fee934c2f6d85daaaa2edf65b380485a0 25 hours ago 236 MB wildfly-centos latest fc378232f03d04bff96987f4c23969461582f73c3a7b473a7cb823ac67939f48 5 days ago 619.6 MB arungupta/wildfly-centos latest ...

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Beyond the JAX-RS spec: Apache CXF search extension

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In today’s post we are going to look beyond the JAX-RS 2.0 specification and explore the useful extensions which Apache CXF, one of the popular JAX-RS 2.0 implementations, is offering to the developers of REST services and APIs. In particular, we are going to talk about search extension using subset of the OData 2.0 query filters. In the nutshell, search ...

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Continuous Deployment: Implementation

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This article is part of the Continuous Integration, Delivery and Deployment series. Previous post described several Continuous Deployment strategies. In this one we will attempt to provide one possible solution for reliable, fast and automatic continuous deployment with ability to test new releases before they become available to general users. If something goes wrong we should be able to rollback ...

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Do You Really Understand SQL’s GROUP BY and HAVING clauses?

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There are some things in SQL that we simply take for granted without thinking about them properly. One of these things are the GROUP BY and the less popular HAVING clauses. Let’s look at a simple example. For this example, we’ll reiterate the example database we’ve seen in this previous article about the awesome LEAD(), LAG(), FIRST_VALUE(), LAST_VALUE() functions:   ...

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Manipulating JARs, WARs, and EARs on the Command Line

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Although Java IDEs and numerous graphical tools make it easier than ever to view and manipulate the contents of Java archive (JAR, WAR, and EAR) files, there are times when I prefer to use the command-line jar command to accomplish these tasks. This is particularly true when I have to do something repeatedly or when I am doing it as ...

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The downside of version-less optimistic locking

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Introduction In my previous post I demonstrated how you can scale optimistic locking through write-concerns splitting. Version-less optimistic locking is one lesser-known Hibernate feature. In this post I’ll explain both the good and the bad parts of this approach.         Version-less optimistic locking Optimistic locking is commonly associated with a logical or physical clocking sequence, for both ...

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REST Messages And Data Transfer Objects

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In Patterns of Enterprise Application Architecture, Martin Fowler defines a Data Transfer Object (DTO) as: An object that carries data between processes in order to reduce the number of method calls. Note that a Data Transfer Object is not the same as a Data Access Object (DAO), although they have some similarities. A Data Access Object is used to hide ...

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