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5 best practices for writing bug free java code

5 best practices for writing bug free java code


Java is the second most popular language according to the report of Github Octoverse above Python and C++ for the fourth year in a row. With excellent cross-platform transferability and scope to build applications that are used almost everywhere, Java is one of the essential programming languages. Writing bug-free java code comes as a challenge to all developers, for which we have compiled five best practices that one can follow if they wish to write flawless java code. 

But before beginning, we want to make it clear that writing bug-free code is not an easy task. Just like any process can’t be ideal, the same goes for writing java code. It requires a great deal of knowledge and also consistency to write bug-free code. These mentioned practices can be included in your development phase so that you write bug-free java code every time.

Test-Driven Development (TDD)

TDD, to be more precise – test-first development starts with developing tests for each one of the features. In this, a check is written before the code is meant to be validated or even sometimes developed. The tests are made considering the expected results and mainly fail for the first time around. It’s a fundamental practice of Extreme Programming.

It has three phases:

  • A unit test is written in failure
  • The code is changed to a sufficient condition to pass the test, even if it is not the ideal solution. If a clear solution is seen as soon after the test, it must be realized immediately and implemented. Otherwise, the code can be improved in the next phase of refactoring. This step aims to obtain success as soon as possible.
  • This is the last phase of refactoring the code, which is often ignored but highly valuable. 


Logging or Capturing the application activity is a feature that Java provides. Log files note the unusual circumstances or errors that may be happening in the program. Log levels make it easy to control logging details as they determine the depth and severity of the errors in log developed. 

High severity level occurs when terrible things happen like when you run out of memory. The warning level comes when any wrong credentials or input are provided. The log system is centrally managed. Using logs, one can check for bugs and can solve those easily before committing.

Predefining the Scope

Securing your code is highly important in the process of writing bug-free java code. Most developers depend on predefined packages, but what is needed is predefining the scope of your code. There are many classes that aren’t closed of their own and leave loopholes for hackers. Classes can be closed within the package, ensuring that hackers do not insert their classes to your code and making it vulnerable to attacks.

image contains different frameworks of Java code

Using External Libraries

One of the most significant advantages of writing in Java is the ocean of libraries and packages that have been built by developers to satisfy the coding needs. Not questioning your coding abilities but if you wish to write code for all functionalities, there is a high chance that you’ll write buggy code. So why not use these libraries instead? 

There is also a bleak chance that your code would be better than a library built by multiple researchers over the years.

Using libraries will make you learn the right pattern to work and also decrease your workload exponentially. Also, if any library does not do the complete job for you, request for the function in the library from the developers or better contribute yourself before reimplementing it.

Code Review

It’s a post-code-writing process, one of the important to build a high-quality code. Code review is a practice that everyone needs to implement in their development process. Now you may ask how does a procedure, done after code is written going to help you in writing bug-free code? Code review is a learning process where a reviewer analyses and criticizes your code to give you another set of eyes to tell what bugs and code smells are present in the code. More experienced programmers will help find more complex mistakes, prompting you to learn more. This learning will make you write a bug-free java code in your next project.

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There is rarely anyone that can write a 100% bug-free code, not even a highly experienced programmer can do that. But having even a single bug can leave your software vulnerable. That is why it becomes a necessity to use an automated code review tool that finds loopholes in your Java code that you didn’t see. CodeGrip does that by using its massive data set of errors and also assists you in solving them using its strong suggestive engine. CodeGrip makes sure that your java code is clean, bug-free and of excellent code quality.


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