Java Code Geeks Java Developers Resource Center

If you don’t know, Spring security can limit the number of sessions a user can have. If you are developing a web application especially a secure web application in Java JEE then you must have come up with the requirement similar to online banking portals have e.g. only one session per user at a time or no concurrent session per user. Even ...

The Java API for JSON Binding (JSON-B) 1.0 strengthens the Java EE platform’s overall support for the JSON data interchange format. Already, the Java API for JSON Processing (JSON-P) 1.1 has proved popular and together they form the perfect partners that fill a long-standing shortcoming in Java EE’s JSON capacity. Next article in this series covers the customization of JSON ...

Design patterns provide us with guidelines to help us implement clear and concise maintainable code. When implementing object-oriented design, both duck typing and the Tell Don’t Ask pattern go hand in hand to produce easily composable and maintainable code. Also functional programming and common interface techniques such as Monads by design implement Tell Don’t Ask. Here we’ll focus on implementing ...

Setting the JNDI Database Connection pool in Spring and Tomcat is pretty easy. Tomcat server documentation gives enough information on how to setup connection pool in Tomcat 5, 6 or 7. Here we will use Tomcat 7 along with spring framework for creating a connection pool in Tomcat server and accessing them in Spring using JNDI code. In our last ...

Last time I set out some of the things a Product Owner should be doing – or at least considering doing. Even a quick look at that list will tell you the Product Owner is going to be a busy person. So in this post I’d like to suggest some thinigs Product Owners should NOT be doing. Product Owners Cutting code should ...

Everything you need to know if you decide to delete your IDE About 3 years ago, I made a big change in the way that I write code. It occurred to me that in a lot of cases, my IDE was slowing me down more than it was helping me work. So, I made the drastic decision to delete it ...

What frustrates me most in my profession of software development is the regular necessity to understand large problem scopes before fixing small bugs, especially if the code is legacy and not mine. Actually, it’s even more frustrating when the code is mine. The “deep thinking,” as they call it, which is always required before even a small issue can be ...

I’ve already written quite a few posts about why I don’t consider JavaBeans real objects. For instance, I think we agreed here and here that model objects are mere syntax sugar and we might as well not have them at all, they are useless abstractions that do not offer any functionality. Nevertheless, let’s try one more time, this time through ...

Parallel code, which is code that runs on more than one thread, was once the nightmare of many an experienced developer, but Java 8 brought a lot of changes that should make this performance-boosting trick a lot more manageable. Parallel Streams Before Java 8 there was a big difference between parallel (or concurrent) code and sequential code. It was also ...