The ls command list the files and directories (and other items) in a given directory. It can be asked to colour the output that it produces to give you an indication of what each file is and what permissions it has. Since I always forget what colour means what here’s a handy list of what …
Most non-trivial applications require at least some asynchronous processing but direct use of the thread library is not allowed in a JEE container environment. To get around this limitation EJB 2.1 introduced a timer service which, although functional, wasn’t very feature rich. This has finally been fixed in EJB 3.1 which brings a new, annotation driven, …
In the previous article we looked at how we can use the CDI qualifier system to pick which one of multiple possible implementations should be used when an injection takes place. In this article I show you how to decide what gets injected at runtime rather than at build time.
In the last article we developed an application that had two alternative implementations of an EJB based QuoteService which unfortunately ran aground because CDI couldn’t choose which of our implementation to use. In this article I’ll discuss how to let the system know which implementation to use by using CDI qualifiers.
In the previous part of this series we developed an application that contained a simple no interface EJB which fed quotes to a QuoteBean which, in turn, supplied them to the JSF page. In this part I’ll modify the QuoteService to make it an interface and then provide two different implementations of that interface.
In the previous part we created a simple little application that comprised just a single bean and a JSF page. The page called the bean and asked for a quote which was then displayed. Under the hood though there was a lot of stuff going on and it’s best to have at least an idea …
Now that we have created the project it’s time to throw caution to the wind and just start writing some code! Right click on the example.simpleproject node under Source Packages and select new… then Java Class. Call the class QuoteBean or some such – it has been common to call classes such as this SomethingBean …
This short series of articles covers some of the basics of working with Java EE 6 (JEE6) and in particular JSF 2.0 and CDI (JSR 299 Context and Dependency Injection). JSF 2.0 and CDI bring some fantastic new functionality to the table but at the same time they also replicate a lot of existing ideas …
Getting Started with JEE 6 – Creating a New Project Read More »
There is a scam doing the rounds that tries to infect your computer or get you to phone a premium rate number for computer support. It goes something like this: You get a phone call from an Indian sounding guy called Edward / Steve / John or something equally improbably. They claim that your computer …
While developing a bit of functionality that transferred data from one database to another in my current JEE 6 web application I came upon the exception below. Surprisingly for exceptions from deep within system this one is actually quite informative if you understand what it’s saying: the key is knowing that XA means distributed transaction. Transactions can be …