Testing an application is a critical task. Before you make an application ready for end users, you have to demonstrate its correctness. You use a test process to prove that correctness is achieved and errors are fixed. Testing is a common task in any software development and quality assurance process. You can find a lot of literature about testing processes and the different approaches you can apply to your developments. There are a lot of libraries as well, such as JUnit, and applications, such as Apache JMeter, that you can use to test your Java applications in an automated way. Testing is even more critical in concurrent application development.
The fact that concurrent applications have two or more threads that share data structures and interact with each other adds more difficulty to the testing phase. The biggest problem you will face when you test concurrent applications is that the execution...