Tag: Java
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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.
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Create a RESTful CRUD Application with Spring Boot
In this article, I will show what are the main endpoint needed to have a CRUD application. I show how and explain to create those endpoints to be RESTful compliant.
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Connect a Database to a Spring Boot Application
In this article, I will connect my Spring Boot Application to a PostgreSQL database. Adding the dependencies, configuring the application and creating the entities and repositories.
The Dev World - Sergio Lema 