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Converting between Completablefuture and Observable


CompletableFuture<T> from Java 8 is an advanced abstraction over a promise that value of type T will be available in the future. Observable<T> is quite similar, but it promises arbitrary number of items in the future, from 0 to infinity. These two representations of asynchronous results are quite similar to the point where Observable with just one item can be ...

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Getting Started with Machine Learning


“Machine learning” is a mystical term. Most developers don’t need it at all in their daily work, and the only details about it we know are from some university course 5 years ago (which is already forgotten). I’m not a machine learning expert, but I happened to work in a company that does a bit of that, so I got ...

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Developing a Data Export Utility with PrimeFaces


My day job involves heavy use of data. We use relational databases to store everything, because we rely on enterprise level data management. Sometimes it is useful to have the ability to extract the data into a simple format, such as a spreadsheet, so that we can manipulate it as-needed. This post outlines the steps that I’ve taken to produce a effective and ...

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Getting Started with PrimeFaces Mobile


Introduction If you have developed an application that utilizes PrimeFaces, or if you are planning to develop a web application for use on desktop and mobile devices, then consider PrimeFaces Mobile for your mobile implementation. This blog post will cover some basics to help you get started developing a mobile interface for an existing PrimeFaces application. However, the same procedures ...

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Cannot Uninstall JavaFX SceneBuilder 1.0 with JDK 8


I was recently removing some of the software development applications, tools, and files I had used from an old Vista-based laptop because the people who are primarily using that laptop now have no interest in software development. As part of that effort, I tried to remove JavaFX Scene Builder 1.0, which I had installed a couple of years ago on ...

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JMS with JBoss A-MQ on OpenShift. Lessons learned about remote Clients and Encryption.


OpenShift is the “open hybrid cloud application platform by Red Hat”. It comes in different flavors and the most interesting part for most of the things you want to do is the public cloud application development and hosting platform “OpenShift Online“. You can easily try it out because using OpenShift Online in the cloud is free and it’s easy. All it takes ...

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Big Data… Is Hadoop the good way to start?


In the past 2 years, I have met many developers, architects that are working on “big data” projects. This sounds amazing, but quite often the truth is not that amazing. TL;TR You believe that you have a big data project?           Do not start with the installation of an Hadoop Cluster — the “how“ Start to ...

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Testing secured EJBs with Arquillian


Testing secured EJBs has been historically hard to get right. Up until now, I have been using proprietary techniques like JBossLoginContextFactory described in the article Testing secured EJBs on WildFly 8.1.x with Arquillian to test secured EJBs. During this year Devoxx, David Blevins, founder of the Apache TomEE project – a lightweight Java EE Application Server, brought to my knowledge ...

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Java performance tuning survey results (part III)


This is the third post in a series where we analyze the results of a survey conducted in October 2014. If you have not already done so, I recommend to start with the first two posts in the series: problem severity analysis and monitoring domain analysis. This post focuses on troubleshooting / root cause detection. The background to this survey ...

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