Top 10 Java Mistakes That Could Cost You As A Developer

by Apoorva Bellapu October 2, 2022

Java is one of those programming languages ​​that has been dominating the tech world for quite some time now. There are countless reasons why Java turns out to be one of the most popular programming languages. Some of the features include portability, automated waste collection, and a smooth learning curve. Well, what goes unnoticed is the fact that Java developers tend to make certain mistakes that cannot be ignored. On that note, let’s take a look at the top 10 Java errors that could cost you as a developer.

Missing ‘break’ keyword in a Switch-Case block

It’s not such a common mistake, but the fact that it sometimes goes unnoticed until production runs get boring. For example, if you forgot to put a “break” in “box 0”, chances are that the program writes “Zero” followed by “One”.

Memory leaks

Since Java uses automatic memory management, there is no need to manually allocate and free memory. However, this does not exclude the possibility of memory allocations. As long as a program creates references to objects that are no longer needed, it won’t be freed, and that’s nothing less than a memory leak.

Ignore existing libraries

Another Java mistake that can cost you dearly as a developer is ignoring the countless amount of libraries written in Java. It’s always best to try searching for available libraries. By doing so, you will definitely master Java as a programming language.

Forgetting to release resources

It is always important for Java developers to release the resource upon completion whenever a program opens a file or network connection. Another area to pay attention to is whether exceptions should be thrown when operating on such resources.

Concurrent Edit Exception

Simultaneous modification of collections, as many know, is quite natural. However, when handled with the usual tools of the concurrent programming toolkit such as synchronization locks, special collections adopted for concurrent modification, etc., Java developers can avoid making mistakes. Yet another area of ​​error when it comes to concurrently modifying the collection is creating a stream from a collection and, while iterating the stream, modifying the backing collection.

Excess waste allocation

Excessive memory allocation is something that usually occurs when the program creates a large number of short-lived objects. In such a situation, the garbage collector works continuously, removing unnecessary objects from memory. The impact of the same is on the performance of the applications in a negative way.

Ignore exceptions

As a Java developer, one can ignore exceptions that arise. However, this is yet another mistake that could cost you dearly as a Java developer. In the majority of cases, you should resolve the issues causing these exceptions and you are good to go.

Break contracts

Breaking contracts is not something that would always lead to exceptions or compiling breaking code. However, things can get even more complicated as it can cause the app to change its behavior without any signs of danger. Wrong code could creep into the production version and lead to various unwanted effects including bad UI behavior, wrong data reporting, poor application performance, data loss, etc.

Using null references without need

Unnecessary use of null references is also problematic, and something Java developers should avoid. One of the best strategies is to use an Optional type which can be either an empty object or a wrap of some value.

Use a raw type instead of a parameterized type

According to the Java specification, raw types are either unparameterized members or non-static members of the R class that are not inherited from the superclass or superinterface of R. Until the introduction of generic types in Java, there was no alternative to raw types. A raw type has supported generic programming since version 1.5, and generics have undoubtedly been a significant improvement.

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