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# How to Fix the "Can not deserialize instance of java.util.ArrayList out of START_OBJECT token" Error So, you encountered the dreaded "Can not deserialize instance of java.util.ArrayList out of START_OBJECT token" error. Don't worry, you're not alone! Th

## 🌐 How to determine programmatically the current active profile using Spring Boot? 🤔 Hey there, tech enthusiasts! 👋 Are you using Spring Boot for your projects and wondering how to programmatically determine the current active profile? Well, you've c

# Spring Boot and Multiple External Configuration Files: Defying Defaults 💥 Are you struggling with multiple property files and configuration overrides in your Spring Boot application? 🤔 Don't worry, we've got your back! In this guide, we'll walk you th

# Easy Solutions for "Error creating bean with name 'entityManagerFactory' defined in class path resource" error Hey there fellow developers! 👋 Have you been working on your Spring project and encountered the dreaded "Error creating bean with name 'enti

# How to return a custom object from a Spring Data JPA GROUP BY query 😎💪 So you're working on a Spring Boot application, utilizing the power of Spring Data JPA for your data access needs. You've come across a situation where you need to perform a GROUP

📝👩‍💻**Hey there, fellow tech enthusiasts!**👋 In this blog post, we'll tackle a common issue that arises when trying to retrieve the active user's UserDetails in a Spring application. Fortunately, there's a practical and elegant solution to this problem

# How to Return a Simple String as JSON in a Spring MVC Rest Controller 😎💡 So you have a Spring MVC Rest Controller and you want to return a simple string as JSON in the response body. You might think it's as easy as returning the string directly, but S

# Unit Testing with Spring Security: Simplifying Authentication for Your Tests 🛡️ 👋 Welcome to our blog! Today, we'll address a common issue that many developers face when unit testing with Spring Security. We'll provide you with easy solutions to simpl

# Understanding the Difference between @Valid and @Validated in Spring If you have been working with Spring and using validation methods, you might have come across the annotations `@Valid` and `@Validated`. While both annotations serve the purpose of val