Having just returned from the Atlassian Camp 2012 I just toyed around with Java and Scala and wanted to share the following snippet that demonstrates how to mix code from both languages in a Maven project using the maven-scala-plugin. Setting up the Maven Project First create a new Maven project in your IDE or by running mvn archetype:generate. In the next step, add the dependency for scala-library and the scala maven repositories to your pom.xml and hook the maven-scala-plugin to Maven’s lifecycle. My pom.xml finally looks like this one: ...

Since I got a new tablet running Android 4.0 aka ice cream sandwich I wanted to play around a bit with the fragments API and creating an application for a tablet. In the following tutorial, we’re going to build an application that renders several articles from a popular tech blog (just kidding) in a web view. What to build We’re going to build an application that is able to display web links in the left section of the screen and when clicked, displaying the corresponding website content in the right section of the application screen. ...

A lot has changed since Selenium RC and WebDriver has given us a new syntax to write tests for our web pages. PageObjects add an abstraction to the pages under test and finally we’re able to programmatically start Selenium server instances and use them to run the tests. In the following tutorial, we’re writing some tests using PageObjects, WebDriver, Selenium Server and finally we’re even taking some screenshots of our tested web pages.. ...

JUnit Rules are a handy solution if one needs to alter test methods or wants to share common functionality between several test cases. JUnit 4.10 introduced a new class to order several rules according to our needs using a so called rule-chain. In the following example, we’re going to create a simple custom rule and afterwards bind several instances of it in a specified order to a test method. Adding JUnit Just one Maven dependency needed here – JUnit 4.10 ...

Often we’re writing an application that has to handle entities that – on the one side need to be persisted in a relational database using standards like the Java Persistence API (JPA) and using frameworks like Hibernate ORM or EclipseLink. On the other side those entities and their fields are often stored in a highspeed indexer like Lucene. From this situation arises a bunch of common problems .. to synchronize both data sources, to handle special data mapped in an entity like an office document and so on.. ...

Often in the life of developer’s life there is a scenario where using a relational database tends to get complicated or sometimes even slow – especially when there are fragments with multiple relationships or multiple connections present. This often leads to complex database queries or desperate software engineers trying to handle those problems with their ORM framework. A possible solution might be to switch from a relational database to a graph database – and – neo4j is our tool of choice here. In the following tutorial we’re going to implement several examples to demonstrate the strengths of a graph database .. from a route planner to a social graph. ...

The more smartphones and tablets are sold the bigger the need for a mobile version of a modern website. PrimeFaces Mobile helps us developers here and allows us to quickly create mobile websites that display well on an iPhone, Android, Palm, Blackberry, Windows Mobile and others. In the following tutorial we’re going to create a web application that is using Java Server Faces 2.1, PrimeFaces 3.1 and PrimeFaces Mobile 1.0 and runs on a simple web container like Tomcat or Jetty. ...

Using reusable styles and themes to modify an Android application’s look is really easy and helps to not violate thy DRY (don’t repeat yourself) principle by typing styles in every single UI element again and again. In the following tutorial we’re going to write and apply some simple styles and a finally theme to a simple Android application. Prerequisites The following environment is needed to follow this tutorial … Java Development Kit 6 Android SDK An AVM with at least Android 2.2 / API Version 8 I recommend using Eclipse with the ADT Plugin installed ...

In today’s tutorial we’re going to take a look on how to handle periodically scheduled tasks on our Android device by using BroadcastReceivers, Services and the AlarmManager. Prerequisites The following environment is needed to follow this tutorial … Java Development Kit 6 Android SDK An AVM with at least Android 2.2 / API Version 8 I recommend using Eclipse with the ADT Plugin installed The Concept We’re going to create a first broadcast receiver that gets initiated at boot time. This component then should make use of Android’s AlarmManager API and schedule a cyclic task using an explicit intent. ...

The MemoryAnalyzer Plugin for Eclipse allows us to quickly analyze heap dumps from a virtual machine and search for memory leaks. In the following tutorial we’re going to create and run a small application that is going to cause an OutOfMemoryException during its runtime. In addition, we’re forcing the virtual machine to save a heap dump and finally analyzing this data using Eclipse and the MemoryAnalyzer plugin. Prerequisites Java Development Kit 6 Eclipse Indigo ...