Some time ago I discovered CSS sprites and I said to myself “what a cool thing, I must definitely use it on, for all the existent social, flags and media icons”- by using CSS sprites you send only one HTTP request to get the bigger picture, instead of issuing individual HTTP requests for each icon.  When I finally rolled up my sleeves and built a CSS sprite for the icons, I had another revelation – I recalled having heard about icon fonts, which were supposed to be superior to using images as icons in every way (well maybe except the monochromatic part…).

Octocat Source code for this post is available on Github - is an open source project.

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In this post I will present how to log in a Spring based application with the help of Simple Logging Facade for Java (SLF4J) and Logback. For demonstration I will use the application presented in the post Tutorial – REST API design and implementation in Java with Jersey and Spring, to which I will add now logging capabilities.

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In this post I will show you how to setup two or more data sources in a Spring application where the access to the database is done via JPA. It will be a XML-based Spring configuration. To highlight the setup I will use a showcase that builds on an existing demo example I have committed on GitHub, that covers other two posts of mine

Don’t worry! You don’t have to understand what’s going on in those if you just want to see how the setup for multiple data sources looks like – I’ll do a quick introduction in the first part of the post.

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One thing I immediately needed when using GIT/EGit instead of Subversion/Subversive in Eclipse,  was the possibility to quickly revert the changes I made to a file. The good news is that with EGit it goes just as fast…

Revert changes:

  • Subversive  right click on file > Team > Revert…
  • EGitright click on file > Replace With > File in Git Index
Replace with file from Git index

Replace with file from Git index

There are quite often situations, when you’d need to add or substract a time period to a date when you are accessing the database via Java Persistence API(JPA). Now

  • the bad news is that Java Persistence Query Language(JPQL) does not support such operations on dates yet.
  • the good news is that it is possible by using a native query or doing the computation on the Java side. I prefer the second option as it provides database independence.