Spring Boot ORM - Quick Guide


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Spring Boot ORM - Overview

The Spring Framework integrates well with ORM frameworks like Hibernate, Java Persistence API (JPA), Java Data Objects (JDO) and iBATIS SQL Maps. Spring provides resource management, data access object (DAO) implementations, and transaction strategies. Spring allows to configure ORM library features through dependency management. Spring maintains a uniform DAO Exception hiearchies and a generic transaction management for all the ORM libraries it supports.

Spring IoC container facilitates ORM configurations and easy deployment. Following are the key benefits of using Spring framework to create ORM DAO.

  • Easy to Test − Using spring IoC, an ORM implementation can be easily configured. Each piece of persistence unit can be tested in isolation.

  • Common Data Access Exception − Spring wraps ORM Tools exceptions to a common runtime exception as DataAccessException. This approach helps to handle most persistence exception (non-recoverable) in appropriate layers. No need to handle ORM specific boilerplate catch/throws/exception declarations.

  • General Resource Management − Spring application contexts manages persistence objects, their configurations easily. For example, Hibernate SessionFactory instances, JPA EntityManagerFactory instances, JDBC DataSource instances, iBatis SQL Maps configuration objects and other related objects. Spring handles the local as well JTA transaction management by itself.

  • Integrated transaction management − Spring AOP can be used to wrap an ORM code with a declarative AOP styled interceptor either using @Transaction annotation or by specifying transaction AOP advice in XML configuration file. Spring handles transaction semantics, exception handling, rollback and so on. Spring allows to swap transaction managers without affecting the ORM code.

Spring Boot ORM - Environment Setup

This chapter will guide you on how to prepare a development environment to start your work with Spring Boot Framework. It will also teach you how to set up JDK, Eclipse on your machine before you set up Spring Boot Framework −

Step 1 - Setup Java Development Kit (JDK)

Java SE is available for download for free. To download click here, please download a version compatible with your operating system.

Follow the instructions to download Java, and run the .exe to install Java on your machine. Once you have installed Java on your machine, you would need to set environment variables to point to correct installation directories.

Setting Up the Path for Windows 2000/XP

Assuming you have installed Java in c:\Program Files\java\jdk directory −

  • Right-click on 'My Computer' and select 'Properties'.

  • Click on the 'Environment variables' button under the 'Advanced' tab.

  • Now, edit the 'Path' variable and add the path to the Java executable directory at the end of it. For example, if the path is currently set to C:\Windows\System32, then edit it the following way

    C:\Windows\System32;c:\Program Files\java\jdk\bin.

Setting Up the Path for Windows 95/98/ME

Assuming you have installed Java in c:\Program Files\java\jdk directory −

  • Edit the 'C:\autoexec.bat' file and add the following line at the end −

    SET PATH=%PATH%;C:\Program Files\java\jdk\bin

Setting Up the Path for Linux, UNIX, Solaris, FreeBSD

Environment variable PATH should be set to point to where the Java binaries have been installed. Refer to your shell documentation if you have trouble doing this.

For example, if you use bash as your shell, then you would add the following line at the end of your .bashrc

  • export PATH=/path/to/java:$PATH'

Alternatively, if you use an Integrated Development Environment (IDE) like Borland JBuilder, Eclipse, IntelliJ IDEA, or Sun ONE Studio, you will have to compile and run a simple program to confirm that the IDE knows where you have installed Java. Otherwise, you will have to carry out a proper setup as given in the document of the IDE.

Step 2 - Setup Eclipse IDE

All the examples in this tutorial have been written using Eclipse IDE. So we would suggest you should have the latest version of Eclipse installed on your machine.

To install Eclipse IDE, download the latest Eclipse binaries from https://www.eclipse.org/downloads/. Once you download the installation, unpack the binary distribution into a convenient location. For example, in C:\eclipse on Windows, or /usr/local/eclipse on Linux/Unix and finally set PATH variable appropriately.

Eclipse can be started by executing the following commands on Windows machine, or you can simply double-click on eclipse.exe

%C:\eclipse\eclipse.exe 

Eclipse can be started by executing the following commands on Unix (Solaris, Linux, etc.) machine −

$/usr/local/eclipse/eclipse

After a successful startup, if everything is fine then it should display the following result −

Eclipse Home page

Step 3 - Setup m2eclipse

M2Eclipse is eclipse plugin which is very useful integration for Apache Maven into the Eclipse IDE. We are using maven in this tutorial to build spring boot project and examples are run within eclipse using m2eclipse.

Install the lastest M2Eclipse release by using the Install New Software dialog in Eclipse IDE, and point it to this p2 repository: https://download.eclipse.org/technology/m2e/releases/latest/

Step 3 - Setup Spring Boot Project

Now if everything is fine, then you can proceed to set up your Spring Boot. Following are the simple steps to download and install the Spring Boot Project on your machine.

  • Go to spring initializr link to create a spring boot project, https://start.spring.io/.

  • Select project as Maven Project.

  • Select language as Java.

  • Select Spring Boot version as 2.5.5.

  • Set Project Metadata − Group as com.tutorialspoint, Artifact as springbootorm, name as springbootorm, Description as Demo project for Spring Boot ORM and package name as com.tutorialspoint.springbootorm.

  • Select packaging as Jar.

  • Select java as 11.

  • Add dependencies as Spring Web, Spring Data JPA, MySQL Driver and Spring Boot DevTools.

Now click on GENERATE Button to generate the project structure.

Spring Initializr

Once the maven based spring boot project is downloaded, then import the maven project into eclipse and rest eclipse will handle. It will download the maven dependencies and build the project to make it ready for further development.

Step 4 - POSTMAN for REST APIs Testing

POSTMAN is a useful tool to test REST Based APIs. To install POSTMAN, download the latest POSTMAN binaries from https://www.postman.com/downloads/. Once you download the installable, follow the instructions to install and use it.

Spring Boot ORM - Create Project

Using eclipse, select File −> Import −> Existing Maven Project and click Next.

Import Maven Project

Select the project downloaded and extracted from spring initializr during environment setup, as shown below:

Import Maven Project Browse

Click on Finish button and a new project will be created.

Spring Application

Now as we've our project ready, let check following dependencies in pom.xml.

  • Spring Boot Starter Framework libraries

  • MySQL Connector

  • Other related dependencies.

As we are using spring boot, its starter projects automatically handles most of the dependencies.

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.5.5</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.tutorialspoint</groupId>
   <artifactId>springbootorm</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>Spring Boot ORM</name>
   <description>Demo project for Spring Boot ORM</description>
   <properties>
      <java.version>11</java.version>
   </properties>
   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <scope>runtime</scope>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>
</project>

Spring Boot ORM - Application.properties

Spring boot reads application as well as persistence related properties from application.properties. Here we can configure the hibernate or any other ORM framework specific properties as well. We're using generic properties so that we can switch between ORM without changing much code. By default, spring boot configure hibernate as ORM provider if no other ORM library is specified in POM.xml.

Create application.properties under src −> main −> resources directory and update as shown below.

application.properties

#datasource configurations
spring.datasource.url=jdbc:mysql://localhost:3306/tutorialspoint?useSSL=false&allowPublicKeyRetrieval=true
spring.datasource.username=root
spring.datasource.password=root@123
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# show SQL
spring.jpa.show-sql: true
# DDL generation
spring.jpa.generate-ddl=true

Following is the description of key attributes of application.properties.

  • spring.datasource − Database specific attributes like connection url, username, password, driver class etc.

  • spring.jpa − jpa specific attributes like to show sql, to allow create tables etc.

Spring Boot ORM - Update Project

Let's now add a REST API to our the spring application which can add, edit, delete and display employee(s).

Entity − Employee.java

package com.tutorialspoint.springbootorm.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Employee {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private int id;
   private String name;
   private int age;
   private String email;

   public int getId() {
      return id;
   }

   public void setId(int id) {
      this.id = id;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   public int getAge() {
      return age;
   }

   public void setAge(int age) {
      this.age = age;
   }

   public String getEmail() {
      return email;
   }

   public void setEmail(String email) {
      this.email = email;
   }
}

Repository − EmployeeRepository.java

package com.tutorialspoint.springbootorm.repository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import com.tutorialspoint.springbootorm.entity.Employee;

@Repository
public interface EmployeeRepository extends CrudRepository<Employee, Integer>  {
}

Service − EmployeeService.java

package com.tutorialspoint.springbootorm.service;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.tutorialspoint.springbootorm.entity.Employee;
import com.tutorialspoint.springbootorm.repository.EmployeeRepository;

@Service
public class EmployeeService {

   @Autowired
   EmployeeRepository repository;

   public Employee getEmployeeById(int id) {
      return repository.findById(id).get();
   }

   public List<Employee> getAllEmployees(){
      List<Employee> employees = new ArrayList<Employee>();
      repository.findAll().forEach(employee -> employees.add(employee));
      return employees;
   }

   public void saveOrUpdate(Employee employee) {
      repository.save(employee);
   }

   public void deleteEmployeeById(int id) {
      repository.deleteById(id);
   }
}

Service − EmployeeController.java

package com.tutorialspoint.springbootorm.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.tutorialspoint.springbootorm.entity.Employee;
import com.tutorialspoint.springbootorm.service.EmployeeService;

@RestController
@RequestMapping(path = "/emp")
public class EmployeeController {

   @Autowired
   EmployeeService employeeService;

   @GetMapping("/employees")
   public List<Employee> getAllEmployees(){
      return employeeService.getAllEmployees();
   }

   @GetMapping("/employee/{id}")
   public Employee getEmployee(@PathVariable("id") int id) {
      return employeeService.getEmployeeById(id);
   }

   @DeleteMapping("/employee/{id}")
   public void deleteEmployee(@PathVariable("id") int id) {
      employeeService.deleteEmployeeById(id);
   }

   @PostMapping("/employee")
   public void addEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);
   }

   @PutMapping("/employee")
   public void updateEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);
   }	
}

Main Application − SpringBootOrmApplication.java

package com.tutorialspoint.springbootorm;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootOrmApplication {
   public static void main(String[] args) {
      SpringApplication.run(SpringBootOrmApplication.class, args);
   }
}

Spring Boot ORM - Test Hibernate

Now in eclipse, right click on the SpringBootOrmApplication.java, select Run As context menu, and select Java Application. Check the console logs in the eclipse. You can see the below logs:


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.5)

2021-10-05 09:40:27.442  INFO 8704 --- [  restartedMain] c.t.s.SpringBootOrmApplication           : Starting SpringBootOrmApplication using Java 11.0.11 on 
...
2021-10-05 09:40:34.775  INFO 8704 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2021-10-05 09:40:34.858  INFO 8704 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-10-05 09:40:34.880  INFO 8704 --- [  restartedMain] c.t.s.SpringBootOrmApplication           : Started SpringBootOrmApplication in 8.222 seconds (JVM running for 9.564)
2021-10-05 09:41:08.718  INFO 8704 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-10-05 09:41:08.718  INFO 8704 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-10-05 09:41:08.722  INFO 8704 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed initialization in 4 ms

Once server is up and running, Use Postman to make a POST request to add a record first.

Set the following parameters in POSTMAN.

  • HTTP Method − POST

  • URL − http://localhost:8080/emp/employee

  • BODY − An employee JSON

{   
   "age": "35",  
   "name": "Julie",  
   "email": "julie@gmail.com"  
}   

Click on Send Button and check the response status to be OK. Now make a GET Request to get all records.

Set the following parameters in POSTMAN.

  • HTTP Method − GET

  • URL − http://localhost:8080/emp/employees

Click the send button and verify the response.

[{  
   "id": 1,  
   "age": 35,  
   "name": "Julie",  
   "email": "julie@gmail.com"  
}]   

Spring Boot ORM - Maven EclipseLink

Spring Boot by default use Hibernate as ORM implementation. In order to use EclipseLink, we first need to exclude hibernate dependencies from spring-data-jpa dependency in pom.xml

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
   <exclusions>
      <exclusion>
         <groupId>org.hibernate</groupId>
         <artifactId>hibernate-entitymanager</artifactId>
      </exclusion>
      <exclusion>
         <groupId>org.hibernate</groupId>
         <artifactId>hibernate-core</artifactId>
      </exclusion>
   </exclusions>
</dependency>

Now include eclipse-link dependency in pom.xml.

<dependency>
   <groupId>org.eclipse.persistence</groupId>
   <artifactId>org.eclipse.persistence.jpa</artifactId>
   <version>2.7.8</version>
</dependency>

Following is the complete pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.5.5</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.tutorialspoint</groupId>
   <artifactId>springbootorm</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>Spring Boot ORM</name>
   <description>Demo project for Spring Boot ORM</description>
   <properties>
      <java.version>11</java.version>
   </properties>
   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-data-jpa</artifactId>
         <exclusions>
            <exclusion>
               <groupId>org.hibernate</groupId>
               <artifactId>hibernate-entitymanager</artifactId>
            </exclusion>
            <exclusion>
               <groupId>org.hibernate</groupId>
               <artifactId>hibernate-core</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <scope>runtime</scope>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>org.eclipse.persistence</groupId>
         <artifactId>org.eclipse.persistence.jpa</artifactId>
         <version>2.7.8</version>
      </dependency>
      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>
</project>

Save the file and eclipse will update the dependencies automatically.

Spring Boot ORM - Update Project EclipseLink

Spring Boot uses HibernateJpaAutoConfiguration which configures the hibernate implementation by default. In order to switch to EclipseLink, we need to create a custom configuration class which will extend the JpaBaseConfiguration class. JpaBaseConfiguration is the base class which is used to extend and configure JPA for any ORM implementation. Following is the code of EclipsLinkJpaConfiguration.

EclipsLinkJpaConfiguration.java

package com.tutorialspoint.springbootorm;

import java.util.HashMap;
import java.util.Map;

import javax.sql.DataSource;

import org.eclipse.persistence.config.PersistenceUnitProperties;
import org.eclipse.persistence.logging.SessionLog;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.vendor.AbstractJpaVendorAdapter;
import org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter;
import org.springframework.transaction.jta.JtaTransactionManager;

@Configuration
public class EclipsLinkJpaConfiguration extends JpaBaseConfiguration {

   protected EclipsLinkJpaConfiguration(DataSource dataSource, JpaProperties properties,
      ObjectProvider<JtaTransactionManager> jtaTransactionManager) {
      super(dataSource, properties, jtaTransactionManager);
   }

   @Override
   protected AbstractJpaVendorAdapter createJpaVendorAdapter() {
      return new EclipseLinkJpaVendorAdapter();
   }

   @Override
   protected Map<String, Object> getVendorProperties() {
      Map<String, Object> map = new HashMap<>();
      map.put(PersistenceUnitProperties.WEAVING, "false");
      map.put(PersistenceUnitProperties.LOGGING_LEVEL, SessionLog.FINER_LABEL); 
      map.put(PersistenceUnitProperties.DDL_GENERATION, PersistenceUnitProperties.CREATE_ONLY);
      map.put(PersistenceUnitProperties.LOGGING_LEVEL, SessionLog.FINER_LABEL); 
      return map;
   }

   @Bean
   public static DataSource dataSource() {
      final DriverManagerDataSource dataSource = new DriverManagerDataSource();
      dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
      dataSource.setUrl("jdbc:mysql://localhost:3306/tutorialspoint?useSSL=false&allowPublicKeyRetrieval=true");
      dataSource.setUsername("root");
      dataSource.setPassword("root@123");
      return dataSource;
   }
}

We've added Adapter, DataSource and properties using createJpaVendorAdapter(), dataSource() and getVendorProperties() methods respectively.

Update the Entity as well to use Integer instead of int.

package com.tutorialspoint.springbootorm.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Employee {

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Integer id;
   private String name;
   private Integer age;
   private String email;

   public Integer getId() {
      return id;
   }

   public void setId(Integer id) {
      this.id = id;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   public Integer getAge() {
      return age;
   }

   public void setAge(Integer age) {
      this.age = age;
   }

   public String getEmail() {
      return email;
   }

   public void setEmail(String email) {
      this.email = email;
   }
}

Spring Boot ORM - Test EclipseLink

Now in eclipse, right click on the SpringBootOrmApplication.java, select Run As context menu, and select Java Application. Check the console logs in the eclipse. You can see the below logs −


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.5)

...
2021-10-06 09:52:28.187  INFO 10048 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3111 ms
...
[EL Info]: 2021-10-06 09:52:29.063--ServerSession(2026366076)--Thread(Thread[restartedMain,5,main])--EclipseLink, version: Eclipse Persistence Services - 2.7.8.v20201217-ecdf3c32c4
...
[EL Config]: connection: 2021-10-06 09:52:29.424--ServerSession(2026366076)--Connection(460137428)--Thread(Thread[restartedMain,5,main])--Connected: jdbc:mysql://localhost:3306/tutorialspoint?useSSL=false&allowPublicKeyRetrieval=true
	User: root@localhost
	Database: MySQL  Version: 8.0.23
	Driver: MySQL Connector/J  Version: mysql-connector-java-8.0.26 (Revision: 9aae1e450989d62c06616c1dcda3e404ef84df70)
[EL Fine]: connection: 2021-10-06 09:52:29.471--ServerSession(2026366076)--Thread(Thread[restartedMain,5,main])--/file:/F:/tutorialspoint/springbootorm/target/classes/_default login successful
[EL Finer]: metamodel: 2021-10-06 09:52:29.512--ServerSession(2026366076)--Thread(Thread[restartedMain,5,main])--Canonical Metamodel class [com.tutorialspoint.springbootorm.entity.Employee_] not found during initialization.
2021-10-06 09:52:29.796  WARN 10048 --- [  restartedMain] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2021-10-06 09:52:30.543  INFO 10048 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2021-10-06 09:52:30.603  INFO 10048 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-10-06 09:52:30.622  INFO 10048 --- [  restartedMain] c.t.s.SpringBootOrmApplication           : Started SpringBootOrmApplication in 6.556 seconds (JVM running for 7.512)
2021-10-06 09:53:38.526  INFO 10048 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-10-06 09:53:38.527  INFO 10048 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-10-06 09:53:38.532  INFO 10048 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 5 ms

Once server is up and running, Use Postman to make a GET request to get all records.

Set the following parameters in POSTMAN.

  • HTTP Method − GET

  • URL − http://localhost:8080/emp/employees

Click the send button and verify the response.

[{  
   "id": 1,  
   "age": 35,  
   "name": "Julie",  
   "email": "julie@gmail.com"  
}]   
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