Top 10 Java Mistakes that Could Cost Your Job as a Developer

by Apoorva Bellapu October 2, 2022


Java is one of those programming languages ​​that has been dominating the technological world for quite some time. There are countless reasons why Java is emerging as one of the most popular programming languages. Some of the features include portability, automatic garbage collection, and a gentle learning curve. Well, what goes unnoticed is the fact that Java developers tend to make certain mistakes that cannot be ignored. With that in mind, let’s take a look at the 10 most common Java errors that could cost you your job as a developer.

The “break” keyword is missing from a switch case block

This isn’t such a common mistake, but the fact that it sometimes goes undetected until mass production proves annoying. For example, if you forgot to put a “break” in “case 0”, chances are the program will write “zero” followed by “one”.

memory leaks

Since Java makes use of automatic memory management, memory does not have to be allocated and deallocated manually. However, this does not exclude the possibility of memory allocations. As long as a program creates references to obsolete objects, it is not freed, and this is nothing less than a memory leak.

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Neglect of existing libraries

Another Java mistake that can cost you as a developer is ignoring the myriad of libraries written in Java. It is always better to search for available libraries. You will definitely get to know Java as a programming language.

Forgot to release resources

It is always important for Java developers to free the resource every time a program opens a file or network connection. Another area that deserves attention is whether exceptions should be thrown during operations on such resources.

Exception when changing at the same time

Simultaneously modifying collections, as known to many, is quite natural. However, when Java developers avoid bugs when they are handled with common tools from the concurrent programming toolbox like synchronization locks, special collections for concurrent changes, and so on. Another area of ​​failure regarding concurrent collection modification is creating a stream from a collection and changing the underlying collection during stream iteration.

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Excessive garbage allocation

Excessive garbage allocation usually occurs when the program creates many short-lived objects. In such a situation, the garbage collector works continuously, removing unnecessary objects from memory. The effects of the same negatively affect the performance of the applications.

ignore exceptions

As a Java developer, you might not pay attention to the exceptions that occur. However, this is another mistake that could cost you your job as a Java developer. In most cases, you need to fix the issues that are causing these exceptions and you’re good to go.

breaking contracts

Breaking contracts doesn’t always throw exceptions or break code compilation. However, it can get even more complicated as it can result in a change in application behavior with no sign of danger. Bad code might get into the production version and lead to various unwanted effects including poor UI behavior, incorrect data reporting, poor application performance, data loss and more.

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Using null references without need

Unnecessary use of null references is also problematic, which Java developers should avoid. One of the best strategies is to use an optional type, which can be either an empty object or an envelope with a specific value.

Using raw types instead of a parameterized type

According to the Java specs, raw types are either unparameterized or non-static members of the R class that are not inherited from R’s superclass or superinterface. Until the time generic types were introduced in Java, there were no alternatives 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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