The Controller and RestController in the Spring framework are both used to handle the HTTP requests, but they have a difference in their intended use and their behaviour. Difference between Spring Controller vs RestController Controller RestController The controller in Spring typically handles the traditional web requests and produces the HTML views. RestContoller is specifically designed… Read More »
The @Qualifier annotation in the Spring framework is used along with the @Autowired annotation. When we have two or more beans of the same type, in order to distinguish between them as to which bean should be injected, we use the @Qualifier annotation. @Qualifier annotation in Spring Boot Example Let’s understand this with an example.… Read More »
In Java, when the garbage collector fails to collect some unused objects that are still being referenced internally due to the developer’s mistake, this is called a memory leak. It becomes critical overtime; heap memory may keep growing and lead to application out of memory errors. Causes of memory leak in Java There are several… Read More »
In J2EE enterprise applications, the performance of the database queries significantly impacts the application’s efficiency. Slow or poorly performed queries delay the response to the end user, decrease productivity, and eventually lead to business loss. There are various techniques that are used for SQL query optimization. In this article, we will learn about SQL optimization… Read More »
What is Observability? Observability is used to observe the internal states of the application through metrics, logs, and traces and gives insight into the functioning of the application. It makes the application more transparent and easier to monitor, troubleshoot, and manage. Steps to implement Observability in Spring Boot 3.0 Spring Boot observability can be easily… Read More »
Inter thread communication in Java allows the multiple threads to communicate and coordinate with each other. It helps in a concurrent environment when multiple threads work together over shared resources. In Java, we can use the object’s class methods, such as wait(), notify() and notifyAll() to achieve inter-threaded communication. Object’s monitor Monitor is the lock… Read More »
What is ConcurrentHashMap? In Java, ConcurrentHashMap is a class that implements the Map<K,V> interface, and it is synchronised. When we declare a HashMap<K,V> in Java, the JVM internally assigns 16 buckets of memory to it. In ConcurrentHashMap, the lock is on each of the 16 buckets, which facilitates multiple write operations on different buckets concurrently… Read More »
1. String vs. StringBuilder | When to use String and StringBuilder in Java? Feature String StringBuilder Definition String is an immutable class in Java, which means once an object is created, its value cannot be changed. StringBuilder is used to create mutable string objects, which means we can change the content of the StringBuilder object.… Read More »
CORS stands for Cross-Origin Resource Sharing, a security feature that is implemented by web browsers to protect users from malicious websites that try to access data on another domain without permission. It occurs when an application attempts to make a request to a different domain than the one that served the application. In an Angular… Read More »
Angular is an open-source, Typescript based web application framework that runs on Node.js. In this article, we’ll learn how to create a real time weather app using Angular that retrieves weather information based on the name of the city. Steps to build real time weather app Step 1- How to create angular project in Visual… Read More »