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 Collection Mapping in Hibernate For Explanation watch Video :: Directory Structure: pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.test</groupId> <artifactId>CollectionMapping</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>CollectionMapping</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.9</maven.compiler.source> <maven.compiler.target>1.9</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>junit</

 Collection Mapping Spring Data Jpa For Explanation Watch Video: Directory Structure application.properties #datasource spring.datasource.url=jdbc:mysql://localhost:3306/new spring.datasource.username=root spring.datasource.password=root #jpa spring.jpa.hibernate.ddl-auto=create spring.jpa.show-sql=true spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true SpringBootDataJpaCollectionMappingApplication  package com.app; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class SpringBootDataJpaCollectionMappingApplication { public static void main(String[] args) { SpringApplication.run(SpringBootDataJpaCollectionMappingApplication.class, args); } } Employee  package com.app.entity; import java.util.List; import java.util.Map; import java.util.Set; import javax.persistence.CollectionTable; import javax.persistence.Column; import javax.persistence.ElementCollection; import jav