Tag: Java
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Where To Write Documentation
I can use Word file, a private Wiki or write the documentation into comments inside the code base. Which one is the best? What are the advantages and disadvantages of each documentation? In this post, I explain 3 types of documentation, with their advantages and disadvantages.
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OAuth2 With Google, Spring Boot And Angular
In this article, I describe how to create the Google OAuth2 client, how to connect Spring Security to Google OAuth2 workflow, and have a React frontend to communicate with my Spring Boot application.
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Feature Flags: Deploy Unstable Features
In this article I describe the features flags. I explain when I use them and how I use them in different situations. I explain the needed maintenance and the final clean up.
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Optimize Your API Using Memoization
In this article I describe how to use the memoization to optimize the response time of a request. I explain how to prepare the code and how to apply the solution.
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Deploy A Spring Boot Application in AWS Lambda
In the article of today, I’m gonna explain how to deploy a Spring Boot application in AWS Lambda. I want to deploy a complete web application into a serverless platform. The difference is that I want to create several endpoints in my Spring Boot application. And I want to map them all to a single…
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4 Ways to Protect Your Application From Being Hacked
In this article I describe 4 ways to secure an application to avoid 90% of the attacks. 4 simple ways to put in place in every kind of application. From using HTTPs to an external configuration system.
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How to Solve a NullPointerException Correctly
In Java, one of the first exceptions everyone sees is the NullPointerException. Unfortunately, it took me some time to understand how to solve it correctly. In this article, I explain how to solve them correctly.
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Solve the CORS error with Spring Security
In this article I explain how to configure the CORS allowed frontend in a Spring Boot application when using Spring Security.
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Protect your Spring Boot application with JWT
The article provides a comprehensive guide on how to protect a Spring Boot application using JWT and Spring Security. It offers a detailed explanation on various aspects, including adding dependencies, encoding passwords, creating login endpoints, JWT HTTP filtering, and configuring Spring Security. It also emphasizes the importance of having protected routes and a HTTP filter…
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The Hardest Bug I’ve Faced
In this article, I will describe some of the worst bugs that happen in an application. Let’s start by splitting them into two main categories: those which I can reproduce on my laptop, and those I can’t reproduce on my laptop.
The Dev World - Sergio Lema 