TechHub

1. Setting Up Your Spring Boot Project Step 1: Use Spring Initializr Go to Spring Initializr . Select your project metadata: Project : Maven Project Language : Java Spring Boot : (Select the latest stable version) Group : com.example Artifact : swagger-demo Dependencies : Add Spring Web and Springfox Swagger UI . Click on Generate to download the project ZIP file. Extract it to your preferred location. Step 2: Import the Project into Your IDE Open your favorite IDE (e.g., IntelliJ IDEA, Eclipse). Import the project as a Maven project. 2. Creating a Simple REST API Step 1: Create a Model Class Create a new package com.example.swaggerdemoproject.model and create a class named User . package com.example.swaggerdemoproject.model; public class User { private Long id; private String name; // Getters and Setters public Long getId () { return id; } public void setId (Long id) { this .id = id; } public String getName () { ...

Problem: Many developers encounter performance bottlenecks in their Spring applications due to inefficient database queries, improper caching, and suboptimal resource management. These bottlenecks can lead to slow response times and a poor user experience. Solution: This blog post explores strategies for identifying and resolving performance bottlenecks in Spring applications. 1. Profiling and Monitoring We can use tools like Spring Boot Actuator, VisualVM, or JProfiler for profiling Spring applications. Sample : Example configuration to enable Spring Boot Actuator: @SpringBootApplication public class MyApplication { public static void main (String[] args) { SpringApplication.run(MyApplication.class, args); } } 2. Optimizing Database Queries W riting efficient SQL queries and using pagination to handle large datasets. Sample : Example of using pagination with Spring Data JPA: @Repository public interface UserRepository extends JpaRepository <User, Lon...

Caching is an essential technique for improving application performance by storing frequently accessed data. Spring Framework offers a robust caching abstraction that simplifies cache management. In this post, we'll explore advanced caching techniques in Spring, including cacheable methods, cache eviction, and cache management. 1. Setting Up Caching in Spring To get started, ensure you have the following dependencies in your pom.xml (for Maven users): < dependency > < groupId > org.springframework.boot </ groupId > < artifactId > spring-boot-starter-cache </ artifactId > </ dependency > < dependency > < groupId > org.springframework.boot </ groupId > < artifactId > spring-boot-starter-data-jpa </ artifactId > </ dependency > < dependency > < groupId > org.h2database </ groupId > < artifactId > h2 </ artifactId > < scope > runtime ...

In a Spring Boot application, you can use the @Retryable annotation to automatically retry a failed operation. The @Retryable annotation can be applied to a method and can be used to specify the conditions under which the method should be retried. For example: @Retryable (value = { MyException. class }, maxAttempts = 3 , backoff = @Backoff (delay = 1000 )) public void myMethod () throws MyException { // method body } In this example, the myMethod() method will be retried if it throws an exception of type MyException. The method will be retried up to a maximum of 3 times, with a delay of 1000 milliseconds between each retry. You can also specify the @Recover annotation on a method to provide a recovery action for a failed operation. The @Recover method should have the same signature as the retryable method, except that it should have an additional parameter of type Throwable to receive the exception that caused the failure. For example: @Recover public void recover (MyE...

To cache data in a Spring Boot application, you can use the @Cacheable annotation on a method. When the method is called, the data returned by the method will be stored in a cache. Subsequent calls to the method will return the cached data, rather than executing the method again, until the cache is evicted or expired. In the following example,  @EnableCaching  annotation enables the cache mechanism. @SpringBootApplication @EnableCaching public class SpringBootCachingApplication { public static void main (String[] args) { SpringApplication. run (SpringBootCachingApplication. class , args); } } Here is an example of how to use the @Cacheable annotation: @Cacheable (value = "users" , key = "#userId" ) public User getUserById (Long userId) { // This method will be called only on the first invocation, // and the result will be cached. return userRepository. findById (userId); } In this example, the getUserById() method will...

git command to create a new local branch from the remote branch git remote add <name> <remote_repo> git fetch <name> then, git checkout -b [branch] [remotename]/[branch]