What Is Routing in Backend? How Requests Find Their Way to the Right Handler
When a client such as a web application, mobile app, or another service sends a request to a backend server, the server needs to understand what the client wants to…
Understanding HTTP for backend engineers, where it all starts
Understanding HTTP for backend engineers, where it all starts * ### 1. Core Principles of HTTP HTTP (Hypertext Transfer Protocol) is an application-layer protocol (Layer 7 in the OSI…
Spring Boot @Async — Complete Deep Explanation
Spring Boot @Async — Complete Deep Explanation 1. First understand what @Async actually does Normally, Java executes method calls synchronously. public void process() { method1(); method2(); method3(); } Execution…
Why @Transactional Is Not Working in Spring Boot — 10 Common Reasons
Yes 😄. Let's make @Transactional so simple that even a dog could understand it. Think of a transaction like a dog carrying two biscuits. 🐕🍪🍪 🐕 First understand: What…
highest salary employee
package Javapractice; import java.util.stream.Stream; public class practice { public static void main(String[] args) { // TODO Auto-generated method stub //write a java8 program from a employee class with name and…
Find the duplicate elements from a list in java
public class practice { public static void main(String[] args) { // TODO Auto-generated method stub //write a program to find the duplicate elements in an array and print the duplicate…
Reverse a string in java
public class practice { public static void main(String[] args) { // TODO Auto-generated method stub String s="nima"; //reverse string String rev=""; for(int i=s.length()-1;i>=0;i--) { rev=rev+s.charAt(i); } } }
How does Spring Boot decide the order of auto-configurations?
How does Spring Boot decide the order of auto-configurations? Spring Boot’s auto-configuration order looks magical from the outside, but internally it follows a very deterministic algorithm based on class loading,…
Why does @Value sometimes fail to inject properties?
Why does @Value sometimes fail to inject properties? @Value failing to inject properties is one of the most confusing Spring problems because it often fails silently or only in specific…
What happens if @PostConstruct throws an exception?
What happens if @PostConstruct throws an exception? When a @PostConstruct method throws an exception in Spring, it is treated as a fatal bean initialization failure — and depending on where…
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