Knowledge Factory

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 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...

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...

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...

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 =...