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Building A Chat App With Codename One Part 4


This tutorial is starting to get interesting…​. In this section we’ll go deep into animations, special effects, search styling and extracting contacts. In the previous sections we built the first form of the app, logged in and now we need to show the actual login form. Even more importantly we need to show it with style like this:     ...

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Deployment Management Tools: Chef vs. Puppet vs. Ansible vs. SaltStack vs. Fabric


What are the pros and cons of Chef, Puppet, Ansible, SaltStack and Fabric? Working in production today often means continuous deployments and an environment distributed all over the world. When your infrastructure is decentralized and cloud-based and you’re dealing with frequent deployments of largely identical services across largely identical servers, having a way to automate the configuration and maintenance of everything ...

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It’s easy to document your Play Framework REST API with Swagger


This post orig­i­nally ran on http://​swag​ger​.io (7/30/2015) I hav­ing been using Play Frame­work as a Java-based, lightning-fast REST back­end frame­work for sev­eral projects. Later, I was was excited to find Swag­ger and worked to inte­grate it into a few projects. As I strug­gled with it the first time, I thought it would be use­ful to share my expe­ri­ence and cre­ate ...

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Examples of caching backfiring on performance


In 2015 it should not surprise anyone that caching frequently used data is likely to improve the performance of the application. Caching certain data structures locally inside the JVM instead of requesting them via remote calls from external storage is a widely used technique. Introducing such caches to your applications is likely to improve the application’s performance both in regards ...

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Are annotations bad?


I eased off into this topic with my principles on my post about Spring XML vs. Annotations that other day. This easy inlet was also my way of not complicating things too much for my team who is currently involved in writing this new app that will probably have a production life-span for 3-5 years (if we do it right ...

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From Imperative to Pure-Functional and Back Again: Monads vs. Scoped Continuations


This post accompanies this video and won’t make too much sense without it Last month I gave a talk at the Curry On conference, a new conference co-located with the academic, programming language conference, ECOOP. Curry On is intended to bridge the gap between academia. My academic interests do not include programming languages, which I view as the sub-discipline of computer ...

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Installing PostgreSQL PL/Java as a PostgreSQL Extension


In 2011 I wrote a series of articles on PostgreSQL PL/Java. The basic information is still solid but there is a now a much easier way to install PL/Java from source. This also eliminates the need to depend on third parties to create packages. These notes will be fairly brief since I assume my readers are already familiar with git ...

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Easy validation in Scala using Scalaz, Readers and ValidationNel


I’m working on a new book for Packt which shows how you can use various Scala frameworks to create REST services. For this book I’m looking at the following list of frameworks: Finch, Unfiltered, Scalatra, Spray and Akka-HTTP (reactive streams). While writing the chapters on Finch and Unfiltered I really liked the way these two frameworks handled validation. They both ...

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Making Thread Dumps Intelligent


Long back I had learnt about something called Log MDC, and I was a big fan of it. I was suddenly able to make sense of anything that happens in log files and pin-point to a specific log entry and find what’s right or wrong with it especially when it was about debugging a bug in production. In 2013 I was ...

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Hibernate: use join table alias on sqlRestriction


When using hibernate in case of complex queries there is the need to use sql. Therefore sqlRestrictions come to the rescue. However using sql restrictions on join table alias is a bit tricky. There would be three tables: The company table. The employee table. Each employee belongs to one company therefore we have a many to one relationship. The benefit ...

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