Spring Boot, Hibernate and Spring Transaction Tutorial

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1- Objective of the Post

This document is based on:
  • Spring Boot 2.x

  • Hibernate 5.x

  • Eclipse 4.7 (Oxygen)

In this post, I will guide you for creating a Spring Boot project and work with a database  ( Oracle, MySQL, SQL Server, Postgres,..) using Hibernate & Spring Transaction. The matters shall be discussed in this post, including:
  1. Declare the libraries necessary to be able to work with a database.
  2. Configure Spring Boot to be able to connect to a database.
  3. Manipulate with a database using the Session of Hibernate.
  4. Use Spring Transaction and explain the operating principle of Spring Transaction.

2- Prepare a database

MySQL / SQL Server
-- Create table
create table BANK_ACCOUNT
(
  ID        BIGINT not null,
  FULL_NAME VARCHAR(128) not null,
  BALANCE   DOUBLE not null
) ;
--  
alter table BANK_ACCOUNT
  add constraint BANK_ACCOUNT_PK primary key (ID);


Insert into Bank_Account(ID, Full_Name, Balance) values (1, 'Tom', 1000);
Insert into Bank_Account(ID, Full_Name, Balance) values (2, 'Jerry', 2000);
Insert into Bank_Account(ID, Full_Name, Balance) values (3, 'Donald', 3000);

commit;
Oracle
-- Create table
create table BANK_ACCOUNT
(
  ID        NUMBER(19) not null,
  FULL_NAME VARCHAR2(128) not null,
  BALANCE   NUMBER not null
) ;
--  
alter table BANK_ACCOUNT
  add constraint BANK_ACCOUNT_PK primary key (ID);


Insert into Bank_Account(ID, Full_Name, Balance) values (1, 'Tom', 1000);
Insert into Bank_Account(ID, Full_Name, Balance) values (2, 'Jerry', 2000);
Insert into Bank_Account(ID, Full_Name, Balance) values (3, 'Donald', 3000);

commit;
PostGres
Create table Bank_Account (
   ID Bigint not null,
   Full_Name Varchar(128) not null,
   Balance real not null,
   CONSTRAINT Bank_Account_pk PRIMARY KEY (ID)
);

Insert into Bank_Account(ID, Full_Name, Balance) values (1, 'Tom', 1000);
Insert into Bank_Account(ID, Full_Name, Balance) values (2, 'Jerry', 2000);
Insert into Bank_Account(ID, Full_Name, Balance) values (3, 'Donald', 3000);

3- Create a Spring Boot project

On the  Eclipse, create a  Spring Boot project
Enter:
  • Name: SpringBootHibernate
  • Group: org.o7planning
  • Artifact: SpringBootHibernate
  • Description: Spring Boot + Hibernate + Spring Transaction
  • Package: org.o7planning.sbhibernate
Select the technologies and libraries to be used:
  • JPA
  • MySQL
  • PostgrsSQL
  • SQL Server
  • Web
  • Thymeleaf
NOTE: When you select JPA, it will include libraries for Hibernate.

4- Configure pom.xml

If you work with the  Oracle database, you need to declare the following libraries on the pom.xml:
* Oracle *
<dependencies>
    .....

     <dependency>
        <groupId>com.oracle</groupId>
        <artifactId>ojdbc6</artifactId>
        <version>11.2.0.3</version>
    </dependency>
    
    .....
</dependencies>

<repositories>
        ....

    <!-- Repository for ORACLE JDBC Driver -->
    <repository>
        <id>codelds</id>
        <url>https://code.lds.org/nexus/content/groups/main-repo</url>
    </repository>
    
    .....
</repositories>
If you connect to the SQL Service database, you can use either JTDS library or   Mssql-Jdbc library:
* SQL Server *

<dependencies>
       .....

    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
        <scope>runtime</scope>
    </dependency>
    
    <dependency>
        <groupId>net.sourceforge.jtds</groupId>
        <artifactId>jtds</artifactId>
        <scope>runtime</scope>
    </dependency>

     .....
</dependencies>
The full content of the  pom.xml file:
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
    http://maven.apache.org/xsd/maven-4.0.0.xsd">
    
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.o7planning</groupId>
    <artifactId>SpringBootHibernate</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringBootHibernate</name>
    <description>Spring Boot + Hibernate + Spring Transaction</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.M5</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</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-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <!-- SQL Server - Mssql-Jdbc driver -->
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <!-- SQL Server - JTDS driver -->
        <dependency>
            <groupId>net.sourceforge.jtds</groupId>
            <artifactId>jtds</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0.3</version>
        </dependency>
        
        <!-- https://mvnrepository.com/artifact/org.threeten/threetenbp -->
        <dependency>
            <groupId>org.threeten</groupId>
            <artifactId>threetenbp</artifactId>
            <version>1.3.6</version>
        </dependency>
        
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <repositories>

        <!-- Repository for ORACLE JDBC Driver -->
        <repository>
            <id>codelds</id>
            <url>https://code.lds.org/nexus/content/groups/main-repo</url>
        </repository>

        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
        
        
    </pluginRepositories>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>
 

5- Configure Hibernate

For Spring can connect to a Database, you need to configure  necessary parameters in the  application.properties file.
application.properties (MySQL)
# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=root
spring.datasource.password=12345
 


# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
 
application.properites (Sql Server + Mssql-Jdbc)
# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=net.sourceforge.jtds.jdbc.Driver

spring.datasource.url=jdbc:jtds:sqlserver://localhost:1433/testdb;instance=SQLEXPRESS
spring.datasource.username=sa
spring.datasource.password=12345
 


# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.SQLServerDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
 
application.properites (Sql Server + JTDS)
# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

spring.datasource.url=jdbc:sqlserver://localhost:1433/SQLEXPRESS;databaseName=testdb
spring.datasource.username=sa
spring.datasource.password=12345
 


# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.SQLServerDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
 
application.properties (Oracle)
# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver

spring.datasource.url=jdbc:oracle:thin:@localhost:1521:db12c
spring.datasource.username=Test
spring.datasource.password=12345
 


# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.Oracle10gDialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext

 
application.properties (PostGres)
# ===============================
# DATABASE
# ===============================

spring.datasource.driver-class-name=org.postgresql.Driver

spring.datasource.url=jdbc:postgresql://localhost:5432/testdb
spring.datasource.username=postgres
spring.datasource.password=12345
 


# ===============================
# JPA / HIBERNATE
# ===============================

spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL82Dialect
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
 
See more:
Note: By default Spring Boot will automatically configures JPA, and creates Spring BEANs related to the JPA. These automatic configurations of the  Spring Boot include:
  1. DataSourceAutoConfiguration
  2. DataSourceTransactionManagerAutoConfiguration
  3. HibernateJpaAutoConfiguration
The purpose of this application is to use Hibernate, therefore, we need to disable the above automatic configurations of the  Spring Boot.
** SpringBootHibernateApplication **
package org.o7planning.sbhibernate;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

@SpringBootApplication

@EnableAutoConfiguration(exclude = { //
        DataSourceAutoConfiguration.class, //
        DataSourceTransactionManagerAutoConfiguration.class, //
        HibernateJpaAutoConfiguration.class })

public class SpringBootHibernateApplication {


    public static void main(String[] args) {
        SpringApplication.run(SpringBootHibernateApplication.class, args);
    }
  
    .......
}
Then, configure the Spring BEANs required for the  Hibernate.
SpringBootHibernateApplication.java
package org.o7planning.sbhibernate;

import java.util.Properties;

import javax.sql.DataSource;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;

@SpringBootApplication

@EnableAutoConfiguration(exclude = { //
        DataSourceAutoConfiguration.class, //
        DataSourceTransactionManagerAutoConfiguration.class, //
        HibernateJpaAutoConfiguration.class })

public class SpringBootHibernateApplication {

    @Autowired
    private Environment env;

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

    @Bean(name = "dataSource")
    public DataSource getDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();

        // See: application.properties
        dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
        dataSource.setUrl(env.getProperty("spring.datasource.url"));
        dataSource.setUsername(env.getProperty("spring.datasource.username"));
        dataSource.setPassword(env.getProperty("spring.datasource.password"));

        System.out.println("## getDataSource: " + dataSource);

        return dataSource;
    }

    @Autowired
    @Bean(name = "sessionFactory")
    public SessionFactory getSessionFactory(DataSource dataSource) throws Exception {
        Properties properties = new Properties();

        // See: application.properties
        properties.put("hibernate.dialect", env.getProperty("spring.jpa.properties.hibernate.dialect"));
        properties.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
        properties.put("current_session_context_class", //
                env.getProperty("spring.jpa.properties.hibernate.current_session_context_class"));

        LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();

        // Package contain entity classes
        factoryBean.setPackagesToScan(new String[] { "" });
        factoryBean.setDataSource(dataSource);
        factoryBean.setHibernateProperties(properties);
        factoryBean.afterPropertiesSet();
        //
        SessionFactory sf = factoryBean.getObject();
        System.out.println("## getSessionFactory: " + sf);
        return sf;
    }

    @Autowired
    @Bean(name = "transactionManager")
    public HibernateTransactionManager getTransactionManager(SessionFactory sessionFactory) {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager(sessionFactory);

        return transactionManager;
    }
    
}

6- Entity, Model, Form, DAO

In  JPA (or  Hibernate), Entity is a representive class (corresponding to) a table in a database. The fields of this class will correspond to the columns of the table.
We will create a  BankAccount class to represent for the  BANK_ACCOUNT in the database. JPA Annotations will be used to annotate on the fields to describe mappings between the fields and the columns of the table. These mappings is 1-1. Each field corresponds to 1 column of the table.
BankAccount.java
package org.o7planning.sbhibernate.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "Bank_Account")
public class BankAccount {

    @Id
    @GeneratedValue
    @Column(name = "id", nullable = false)
    private Long id;

    @Column(name = "Full_Name", length = 128, nullable = false)
    private String fullName;

    @Column(name = "Balance", nullable = false)
    private double balance;

    public Long getId() {
        return id;
    }

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

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }
}
While an  Entity class represents for the data of a record of a table, a Model class represents for the data of one record of a query statement (joined from one or many tables). You use the Model class when you are interested in some columns of one or many tables.
BankAccountInfo.java
package org.o7planning.sbhibernate.model;

public class BankAccountInfo {

    private Long id;
    private String fullName;
    private double balance;

    public BankAccountInfo() {

    }

    // Used in Hibernate query.
    public BankAccountInfo(Long id, String fullName, double balance) {
        this.id = id;
        this.fullName = fullName;
        this.balance = balance;
    }

    public Long getId() {
        return id;
    }

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

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }
}
BankAccountDAO.java
package org.o7planning.sbhibernate.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.o7planning.sbhibernate.entity.BankAccount;
import org.o7planning.sbhibernate.exception.BankTransactionException;
import org.o7planning.sbhibernate.model.BankAccountInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Repository
@Transactional
public class BankAccountDAO {

	@Autowired
	private SessionFactory sessionFactory;

	public BankAccountDAO() {
	}

	public BankAccount findById(Long id) {
		Session session = this.sessionFactory.getCurrentSession();
		return session.get(BankAccount.class, id);
	}

	public List<BankAccountInfo> listBankAccountInfo() {
		String sql = "Select new " + BankAccountInfo.class.getName() //
				+ "(e.id,e.fullName,e.balance) " //
				+ " from " + BankAccount.class.getName() + " e ";
		Session session = this.sessionFactory.getCurrentSession();
		Query<BankAccountInfo> query = session.createQuery(sql, BankAccountInfo.class);
		return query.getResultList();
	}

	// MANDATORY: Transaction must be created before.
	@Transactional(propagation = Propagation.MANDATORY)
	public void addAmount(Long id, double amount) throws BankTransactionException {
		BankAccount account = this.findById(id);
		if (account == null) {
			throw new BankTransactionException("Account not found " + id);
		}
		double newBalance = account.getBalance() + amount;
		if (account.getBalance() + amount < 0) {
			throw new BankTransactionException(
					"The money in the account '" + id + "' is not enough (" + account.getBalance() + ")");
		}
		account.setBalance(newBalance);
	}

	// Do not catch BankTransactionException in this method.
	@Transactional(propagation = Propagation.REQUIRES_NEW, rollbackFor = BankTransactionException.class)
	public void sendMoney(Long fromAccountId, Long toAccountId, double amount) throws BankTransactionException {

		addAmount(toAccountId, amount);
		addAmount(fromAccountId, -amount);
	}

}
BankTransactionException.java
package org.o7planning.sbhibernate.exception;

public class BankTransactionException extends Exception {
    
    private static final long serialVersionUID = -3128681006635769411L;
    
    public BankTransactionException(String message) {
        super(message);
    }

}
SendMoneyForm.java
package org.o7planning.sbhibernate.form;

public class SendMoneyForm {
    
    private Long fromAccountId;
    private Long toAccountId;
    private Double amount;
 
    public SendMoneyForm() {
 
    }
 
    public SendMoneyForm(Long fromAccountId, Long toAccountId, Double amount) {
        this.fromAccountId = fromAccountId;
        this.toAccountId = toAccountId;
        this.amount = amount;
    }
 
    public Long getFromAccountId() {
        return fromAccountId;
    }
 
    public void setFromAccountId(Long fromAccountId) {
        this.fromAccountId = fromAccountId;
    }
 
    public Long getToAccountId() {
        return toAccountId;
    }
 
    public void setToAccountId(Long toAccountId) {
        this.toAccountId = toAccountId;
    }
 
    public Double getAmount() {
        return amount;
    }
 
    public void setAmount(Double amount) {
        this.amount = amount;
    }
    
}

Explain the operation mechanism of Spring Transaction:

In this example, I simulate a bank transaction. A account sends to B account an amount of  700$. Thus, two actions will be created in the database: 
  1. Add 700$ to B account.
  2. Subtract 700$ from A account.

If the first action succeeds (add $ 700 to B account), but the second action fails for a reason, the bank will suffer a damage.
Therefore, it needs to manage the transaction to ensure that if an action fails, the data will rollback the original state (before transaction). The transaction is considered successful when all actions are successful.
Use  the @Transactional(rollbackFor = BankTransactionException.class) to annotate on a method to tell the  "Spring Transaction" "let's apply the  AOP to this method".
@Transactional(propagation = Propagation.REQUIRES_NEW,
                         rollbackFor = BankTransactionException.class)
public void sendMoney(Long fromAccountId, Long toAccountId,
                       double amount) throws BankTransactionException {

    addAmount(toAccountId, amount);
    addAmount(fromAccountId, -amount);
}
The  Spring Transaction applies the  Spring AOP to your method, which is like changing code of the method, add code to catch the exception and call Rollback transaction when the exception occurs, then it rethrows the exception out of the method. All are the same as the following illustration:

7- Controller

MainController.java
package org.o7planning.sbhibernate.controller;

import java.util.List;

import org.o7planning.sbhibernate.dao.BankAccountDAO;
import org.o7planning.sbhibernate.exception.BankTransactionException;
import org.o7planning.sbhibernate.form.SendMoneyForm;
import org.o7planning.sbhibernate.model.BankAccountInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class MainController {

    @Autowired
    private BankAccountDAO bankAccountDAO;

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String showBankAccounts(Model model) {
        List<BankAccountInfo> list = bankAccountDAO.listBankAccountInfo();

        model.addAttribute("accountInfos", list);

        return "accountsPage";
    }

    @RequestMapping(value = "/sendMoney", method = RequestMethod.GET)
    public String viewSendMoneyPage(Model model) {

        SendMoneyForm form = new SendMoneyForm(1L, 2L, 700d);

        model.addAttribute("sendMoneyForm", form);

        return "sendMoneyPage";
    }

    @RequestMapping(value = "/sendMoney", method = RequestMethod.POST)
    public String processSendMoney(Model model, SendMoneyForm sendMoneyForm) {

        System.out.println("Send Money::" + sendMoneyForm.getAmount());

        try {
            bankAccountDAO.sendMoney(sendMoneyForm.getFromAccountId(), //
                    sendMoneyForm.getToAccountId(), //
                    sendMoneyForm.getAmount());
        } catch (BankTransactionException e) {
            model.addAttribute("errorMessage", "Error: " + e.getMessage());
            return "/sendMoneyPage";
        }
        return "redirect:/";
    }

}

8- Thymeleaf Template

_menu.html
<div xmlns:th="http://www.thymeleaf.org"
     style="border: 1px solid #ccc;padding:5px;margin-bottom:20px;">

  <a th:href="@{/}">Accounts</a>

     | &nbsp;

   <a th:href="@{/sendMoney}">Send Money</a>  
  

</div>
accountsPage.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>Bank</title>

<style>
th, td {
    padding: 5px;
}
</style>

</head>

<body>
    <!-- Include _menu.html -->
    <th:block th:include="/_menu"></th:block>

    <h2>Accounts</h2>

    <table border="1">
        <tr>
            <th>ID</th>
            <th>Full Name</th>
            <th>Balance</th>
        </tr>
        <tr th:each="accountInfo : ${accountInfos}">
            <td th:utext="${accountInfo.id}">..</td>
            <td th:utext="${accountInfo.fullName}">..</td>
            <td th:utext="${accountInfo.balance}">..</td>
        </tr>

    </table>
</body>
</html>

 
sendMoneyPage.html
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
   <head>
      <title>Bank</title>
   </head>
  
   <body>      
      <!-- Include _menu.html -->
      <th:block th:include="/_menu"></th:block>
      
      <h2>Send Money</h2>
      <ul>
         <li>1 - Tom</li>
         <li>2 - Jerry</li>
         <li>3 - Donald</li>
      </ul>
      
      <div th:if="${errorMessage!=null}"
           style="color:red;font-style:italic" th:utext="${errorMessage}">..</div>
      
      <form th:action="@{/sendMoney}" th:object="${sendMoneyForm}" method="POST">
         <table>

           <tr>
              <td>From Bank Account Id</td>
              <td><input type="text" th:field="*{fromAccountId}"/></td>
           </tr>
           <tr>
              <td>To Bank Account Id</td>
              <td><input type="text" th:field="*{toAccountId}"/></td>
           </tr>
            <tr>
              <td>Amount</td>
              <td><input type="text" th:field="*{amount}" /></td>
           </tr>          
           <tr>
              <td>&nbsp;</td>
              <td><input type="submit" value="Send"/></td>
           </tr>      
         </table>      
      </form>
      
   </body>
</html>
 

9- Run the application

On  Eclipse, run your application.

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