Preface This is part 10 of tutorials for first-time programmers getting into Scala. Other posts are on this blog, and you can get links to those and other resources on the links page of the Computational Linguistics course I’m creating these for. Additionally you can find this and other tutorial series on the JCG Java Tutorials page. The tutorials up ...

This post will focus on basic principles and mechanics of writing Java integration tests for a RESTful API (with a JSON payload). The goal is to provide an introduction to the technologies and to write some tests for basic correctness. The examples will consume the latest version of the GitHub REST API. For an internal application, this kind of testing ...

In a previous post, we demonstrated how to create and configure Quartz jobs with annotations in a Spring container. We used a class-level annotation to add some metadata to a bean which implements Quartz’s Job; the annotation defines the job’s name, group, and its cron-expression. Later, a big portion of the code is dedicated to handling that annotation: find the ...

Our development team wanted to get notified as soon as something goes wrong in our production system, a critical Java web application serving thousands of customers daily. The idea was to let it send us an email when there are too many errors, indicating usually a problem with a database, an external web service, or something really bad with the ...

Many RDBMS support the concept of “routines”, usually calling them procedures and/or functions. These concepts have been around in programming languages for a while, also outside of databases. Famous languages distinguishing procedures from functions are: Ada BASIC Pascal etc… The general distinction between (stored) procedures and (stored) functions can be summarized like this: Procedures: Are called using JDBC CallableStatement Have ...

This post explores the new Java caching standard: javax.cache. How it Fits into the Java Ecosystem This standard is being developed by JSR107, of which the author is co-spec lead. JSR107 is included in Java EE 7, being developed by JSR342. Java EE 7 is due to be finalised at the end of 2012. But in the meantime javax.cache will ...

OVERVIEW To start with it is natural to assume that static fields have a special life cycle and live for the life of the application. You could assume that they live is a special place in memory like the start of memory in C or in the perm gen with the class meta information. However, it may be surprising to ...

Sometimes we can do really weird and funny things with Java; Some other times we are just being creative! Take a look at the following three examples and you will find out what I mean! Have Fun! Strine translator Translating to Strine ;)   public static void main(String... args) { System.out.println("Hello World"); } static { try { Field value = ...

Good functional testing is one of the most difficult tasks for web application developers and their teams. It is a challenge to develop tests that are cheap to maintain and yet provide good test coverage, which helps reduce QA costs and increase quality. Both Selenium and WebDriver (which is essentially now the successor to Selenium) provide a good way to ...