Our experts used a popular Java testing framework called JUnit to create tests and streamline the testing process.

We began with unit testing, meticulously examining each individual component of the app. Then, our team proceeded to integration testing, studying how different software modules work together. Lastly, we conducted stress testing to ensure that the app could handle multiple users without crashing.

NullPointerException is a type of runtime exception in Java. It happens when a program tries to use an object reference with a null value. There can be many reasons why NullPointerExceptions occur, like accessing properties of null objects, using a null object in a synchronized block, etc. To resolve these errors, we added more validations to the code.

During the game, players had to navigate various park locations, completing tasks. Each location corresponds to a particular “game station” within the app. However, at a certain point, the game was freezing and users were unable to proceed. Our experts investigated the issue and simulated multiple players switching quickly between game stations. We discovered that a concurrency error was the culprit. Concurrency errors are notorious for being difficult to detect yet often causing significant system failures. In general, there are two types of such errors – race condition and deadlock. In our case, it was the latter. To resolve the issue, we implemented proper transaction isolations for the game state update methods.