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Self-healing JVM

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This post is an example about an application where the first solution to each and every IT problem – “have you tried turning it off and on again” – can backfire and do more harm than good. Instead of turning things off and on, we have an application that can literally heal itself: it fails at the beginning, but starts ...

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Java Servlet Tutorial – The ULTIMATE Guide

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Java Servlets is a Java based web technology. Java Servlet technology provides Web developers with a simple, consistent mechanism for extending the functionality of a Web server and for accessing existing business systems. A servlet can almost be thought of as an applet that runs on the server side–without a face. Java servlets make many Web applications possible. Java Servlets ...

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Developers want to be heard

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How often have you been in this situation? You’re in a meeting with the team and you’re all discussing the implementation of a new feature. The group seems to be converging on a design, but there’s something about it that feels off, some sort of “smell”.  You point this out to the team, perhaps outlining the specific areas that make you uncomfortable. ...

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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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