Handling exceptions gracefully in a Spring Boot 3 REST application is crucial for providing clear and consistent error responses to the clients. In this section, we’ll explore how to handle exceptions for REST controllers using @ControllerAdvice and @ExceptionHandler annotations, and customize error responses. Setting Up the Project Ensure you have the necessary dependencies in your pom.xml: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> Step 1: Create a Custom Exception Define a custom exception that can be thrown by your REST controllers: ...

In modern web applications, providing clear and user-friendly error messages is crucial for a good user experience. In this blog post, we’ll explore how to customize error handling in a Spring Boot 3 application using Thymeleaf. We’ll look at how to create custom error attributes, define a global error controller, and design a custom error page with Thymeleaf. Setting Up the Project First, ensure your Spring Boot 3 project is set up with the necessary dependencies. We’ll need spring-boot-starter-thymeleaf for the Thymeleaf integration and spring-boot-starter-web for creating the web application. ...

Thymeleaf is a modern server-side Java template engine for web and standalone environments. It is particularly well-suited for Spring Boot applications, offering a natural way to create dynamic web pages. In this blog post, we’ll explore how to integrate Thymeleaf with Spring Boot, create dynamic templates, and use Thymeleaf’s powerful features to build a simple web application. Setting Up Thymeleaf with Spring Boot Step 1: Create a Spring Boot Project Start by creating a new Spring Boot project using Spring Initializr or your preferred method. Make sure to include the Spring Web and Thymeleaf dependencies. ...

Spring Boot Devtools is a powerful tool that significantly improves the development experience by providing features like automatic restarts, live reload, and configurations that are optimized for development. In this blog post, we’ll explore how to set up and use Spring Boot Devtools to speed up your development workflow. Why Use Spring Boot Devtools? Spring Boot Devtools enhances the development process in several ways: Automatic Restarts: Automatically restarts your application whenever files on the classpath change, saving you the hassle of manually restarting the server. Live Reload: Integrates with LiveReload to refresh the browser when resources change, providing instant feedback on your changes. Development-Time Configurations: Applies specific settings that make development easier, like disabling template caching and enabling debug logging. Setting Up Spring Boot Devtools Adding Devtools Dependency First, you need to add the Spring Boot Devtools dependency to your project. This can be done by adding the following dependency to your pom.xml if you are using Maven: ...

In modern software development, containerization has become a key practice for ensuring consistent environments across different stages of development, testing, and deployment. Spring Boot 3 offers robust support for Docker Compose and Testcontainers, making it easier to manage multi-container applications and write comprehensive integration tests. This blog post will guide you through setting up Spring Boot 3 with Docker Compose, using custom container images, and leveraging Testcontainers for integration testing. ...

Introduction: In software development, reusing configurations is a smart way to keep your code clean and modular. If you’re working with Spring Boot 3, there are some handy annotations you can use to import existing configurations into your project. In this blog post, we’ll explore how to use @Import and @ImportResource to achieve this. Importing Java Configurations with @Import: The @Import annotation is used to bring in configurations from other Java classes. This is especially useful when you have common configurations that you want to reuse across multiple applications. ...

Introduction In the world of software development, clear and informative communication is key. This principle extends to every aspect of our work, including the messages we write in Git. Whether it’s a commit message, a pull request (PR) description, or a branch name, well-crafted messages can greatly improve collaboration and project maintainability. In this guide, we’ll explore best practices for writing clear and effective messages in Git. 1. Commit Messages ...

Logging is an essential aspect of any application, providing critical insights and aiding in debugging and monitoring. In a Spring Boot 3 application, you can easily configure log levels for specific loggers to control the verbosity of logs for different packages or classes. In this blog, we’ll explore how to achieve this using properties files, YAML configuration, and programmatic approaches for both Logback and Log4j. Table of Contents Introduction Using application.properties Using application.yml Programmatic Configuration Customizing Logback Configuration Configuring Log4j Conclusion Introduction Spring Boot uses Logback as the default logging framework, but it also supports Log4j2. You can choose the logging framework that best fits your needs. In this blog, we’ll cover configuration for both Logback and Log4j. ...

Question: Given an array of strings strs, group the anagrams together. Answer: To group anagrams together, you can use a dictionary to map sorted strings to their respective groups of anagrams. Here’s how you can do it in Python: def group_anagrams(strs): anagrams = {} for word in strs: sorted_word = ''.join(sorted(word)) if sorted_word in anagrams: anagrams[sorted_word].append(word) else: anagrams[sorted_word] = [word] return list(anagrams.values()) # Example strs = ["eat", "tea", "tan", "ate", "nat", "bat"] print(group_anagrams(strs)) In this code: We iterate through each word in the input array. For each word, we sort its characters and use the sorted string as a key in the anagrams dictionary. If the sorted string already exists in the dictionary, we append the word to its list of anagrams. Otherwise, we create a new entry with the sorted string as the key and a list containing the word as its value. Finally, we return the values of the anagrams dictionary as a list, which contains lists of anagrams. This solution has a time complexity of O(n * k * log(k)), where n is the number of words in the input array and k is the maximum length of a word. The space complexity is O(n * k) due to the dictionary used to store the grouped anagrams. ...

Question: Given an array of integer nums and an integer target, return indices of the two numbers such that they add up to the target. Answer: To solve this problem, you can use a dictionary to store the indices of the numbers you’ve seen so far. As you iterate through the array, you can check if the complement of the current number (target - current number) exists in the dictionary. If it does, you’ve found the two indices that add up to the target. ...