Let's take an example. We want to test some code that is saving the data to the table in the database. Here, testing the database is not our motive; we just want to be sure whether the code that we have written is working fine or not. Enterprise Java application consists of many classes that are interdependent. As dependency exists in the objects, it becomes difficult to carry out the testing.

Spring mainly addresses the discussed problems and provides a very powerful yet easy solution. Let's discuss one by one how Spring provides this solution.