spring boot hibernate entitymanager

EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("persistence");
		EntityManager entityManager = entityManagerFactory.createEntityManager();
 
		entityManager.getTransaction().begin();
		Employee employee = new Employee();
		employee.setName("Sanjay");
 
                // Save Entity
		entityManager.persist(employee);
		entityManager.getTransaction().commit();
		System.out.println("Generated Employee ID = " + employee.getEmployeeId());

            entityManager.getTransaction().begin();
		entityManager.remove(emp);
		entityManager.getTransaction().commit();

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
             http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
	version="2.1">
 
	<persistence-unit name="persistence">
		<description>JPA Entity Manager</description>
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
 
		<properties>
			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/test" />
			<property name="hibernate.hbm2ddl.auto" value="update" />
			<property name="javax.persistence.jdbc.user" value="root" />
			<property name="javax.persistence.jdbc.password" value="root" />
			<property name="hibernate.show_sql" value="true" />
		</properties>
 
	</persistence-unit>
 
</persistence>

package com.frugalis.entity;
 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
 
@Entity
@Table(name = "EMPLOYEE")
public class Employee {
	private int employeeId;
 
	private String name;
 
	@Id
	@Column(name = "EMPLOYEE_ID")
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	public int getEmployeeId() {
		return employeeId;
	}
 
	public void setEmployeeId(int employeeId) {
		this.employeeId = employeeId;
	}
 
	@Column(name = "EMPLOYEE_NAME")
	public String getName() {
		return name;
	}
 
	public void setName(String name) {
		this.name = name;
	}
 
	@Override
	public String toString() {
		return "Employee [ID=" + employeeId + ", Name=" + name + "]";
	}
 
}

<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.frugalis.entity</groupId>
	<artifactId>Entity-Manager-Example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
 
	<name>Entity Manager</name>
	<url>http://maven.apache.org</url>
 
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
 
	<dependencies>
		<!-- MySQL connector -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>6.0.5</version>
		</dependency>
		<!-- Hibernate 5.2.6 Final -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>5.2.6.Final</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>
 
	<build>
		<sourceDirectory>src/main/java</sourceDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

// close the entity manager
 entityManager.close();
 entityManagerFactory.close();