Drones, quadcopters, RS helicopters and other remote controlled crafts are hot topic these days. We programmers are more interested in how to program them to do something cool. Indeed, it’s become more and more easy.
As a Blaze Advisor rules programmer, I often get errors like this. They are almost always Java related. Last time I struggled with “JVM not found” while installing the Blaze Advisor IDE.
I needed to reinstall my WebSphere Application Server several times and as a result the server wouldn’t start at all with the following error:
Installing Blaze Advisor is not always easy. The problem often is that Blaze Advisor installation can’t find java on your pc. Here is how I do it:
We’ve earlier written a post about Recipe for a high-quality “equals” method. This is harder to get right in the case of inheritance.
Controllers in Spring MVC are designed to be shared between requests. Each controller has a default singleton scope so if you are using controllers you need to be aware of that. The easiest way to make sure your controller is thread-safe is to avoid class variables. F.ex. this example from Spring MVC tutorial:
To see the SQL that your application sends to the database during the execution, insert the following property in your XML property file:
We continue to cover small programming basics topic and in this article we will talk about returning values from methods.
When we start writing a program, we don’t always know how it will look like in the future. So we start simple and create a procedure to calculate something for a person:
In this article we will explain the heuristic called the Law of Demeter (LoD) and give an example of how it works in Java.
