Posts

Integrating LinkedIn Authentication in a Spring Boot 3 application

Image
To integrate LinkedIn authentication in a Spring Boot application with Spring Security, you can use OAuth 2.0 authentication to authenticate users via LinkedIn. Spring Security 6+ provides OAuth 2.0 support for integrating third-party login services like LinkedIn. Here’s how to set up LinkedIn authentication with Spring Boot 3 and Spring Security 6+. 1. Add Dependencies In your pom.xml, include the necessary dependencies for Spring Security and OAuth 2.0 support.   <dependencies>     <!-- Spring Boot Starter Web -->     <dependency>         <groupId> org.springframework.boot </groupId>         <artifactId> spring-boot-starter-web </artifactId>     </dependency>     <!-- Spring Boot Starter Security -->     <dependency>         <groupId> org.springframework.boot </groupId>         ...

Deploying a Spring Boot application on AWS Elastic Beanstalk

Image
Deploying a Spring Boot application on AWS Elastic Beanstalk involves several steps. Below is a detailed guide to help you deploy your Spring Boot application: Step 1: Prepare Your Spring Boot Application Create a Spring Boot Application: Ensure that your Spring Boot application is working locally. You can use Spring Initializr to create a new Spring Boot project. Package the Application: Use  Maven  or  Gradle  to package your application into a  .jar  or  .war  file. For Maven, run the following command: mvn clean install This will create the target directory with your .jar file (e.g., my-app-0.0.1-SNAPSHOT.jar ). Step 2: Set Up AWS Elastic Beanstalk 1. Sign in to AWS Management Console: Log in to the AWS Management Console . 2. Create an Elastic Beanstalk Application: Go to Elastic Beanstalk in the AWS Management Console. Click on Create a new application. Give your application a name (e.g., my-spring-boot-app ). 3. Create an Elastic Beanstal...

Connect a Spring Boot application to a Cassandra database - step by step

Image
To connect a Spring Boot application to a Cassandra database, follow these steps: 1. Add Dependencies In your pom.xml (for Maven) or build.gradle (for Gradle), add the necessary dependencies for Spring Boot and Cassandra. For Maven : < dependencies > <!-- Spring Boot Starter Data Cassandra --> < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-data-cassandra</ artifactId > </ dependency > <!-- Other dependencies you may need --> < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-web</ artifactId > </ dependency > </ dependencies > For Gradle : dependencies { implementation 'org.springframework.boot:spring-boot-starter-data-cassandra' implementation 'org.springframework.boot:spring-boot-starter-web' } 2. Configure applicati...

Set up a Hibernate database connection in Java with XML Configuration - step by step

To set up a Hibernate database connection in Java, you will need to configure Hibernate in a Java application and establish a connection to a database. Here's how you can do it step by step: 1. Add Hibernate Dependencies If you're using Maven, add the following dependencies in your pom.xml file: < dependencies > <!-- Hibernate core --> < dependency > < groupId >org.hibernate</ groupId > < artifactId >hibernate-core</ artifactId > < version >5.6.10.Final</ version > <!-- Use the latest stable version --> </ dependency > <!-- Hibernate Validator (Optional, for validation) --> < dependency > < groupId >org.hibernate</ groupId > < artifactId >hibernate-validator</ artifactId > < version >6.0.13.Final</ version > </ dependency > <!-- JDBC Driver for your database --> < dependen...

10 Common Java Interview Questions Related to the Stream API

Java interview questions related to streams are often focused on practical usage of the Stream API introduced in Java 8. Some of the most common practical questions include: 1. Filtering a List Problem: Given a list of integers, filter out the even numbers and return a list of odd numbers. Solution: import java.util.Arrays ; import java.util.List ; import java.util.stream.Collectors ; public class Main { public static void main ( String [] args) { List < Integer > numbers = Arrays . asList ( 1 , 2 , 3 , 4 , 5 , 6 ); List < Integer > oddNumbers = numbers .stream() .filter(n -> n % 2 != 0 ) .collect( Collectors . toList ()); } } 2. Mapping a List Problem:  Given a list of strings, convert all strings to uppercase. Solution: import java.util.Arrays ; import java.util.List ; import java.util.stream.Collectors ; public class Main { public static void main ( String [] args) { List < String > words =...