Quarkus + FreeMarker + Hibernate - CRUD example

Hello everyone, Today we will learn how to develop a Quarkus CRUD web application, using FreeMarker template, H2DB, and Hibernate.


Following technologies stack being used:
  • Quarkus 2.2.3.Final
  • Hibernate 5.5.7.Final
  • Maven 3
  • JDK 11
  • FreeMarker 0.2.7
  • H2DB 
  • Bootstrap
Freemarker is a very popular and mature templating engine. Its integration as a Quarkus extension provides developers ease of configuration, and offers support for native images.

Project Structure:


If you want to use Freemarker you need to add the quarkiverse-freemarker extension. In your pom.xml file.

Dependency Management-Maven-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>com.knf.dev</groupId>
   <artifactId>quarkus-freemarker-crud</artifactId>
   <version>1.0</version>

   <properties>
      <compiler-plugin.version>3.8.1</compiler-plugin.version>
      <maven.compiler.parameters>true</maven.compiler.parameters>
      <maven.compiler.source>11</maven.compiler.source>
      <maven.compiler.target>11</maven.compiler.target>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <quarkus-plugin.version>2.2.3.Final</quarkus-plugin.version>
      <quarkus.platform.artifact-id>quarkus-universe-bom</quarkus.platform.artifact-id>
      <quarkus.platform.group-id>io.quarkus</quarkus.platform.group-id>
      <quarkus.platform.version>2.2.3.Final</quarkus.platform.version>
      <surefire-plugin.version>2.22.1</surefire-plugin.version>
   </properties>

   <dependencyManagement>
      <dependencies>
         <dependency>
            <groupId>${quarkus.platform.group-id}</groupId>
            <artifactId>${quarkus.platform.artifact-id}</artifactId>
            <version>${quarkus.platform.version}</version>
            <type>pom</type>
            <scope>import</scope>
         </dependency>
      </dependencies>
   </dependencyManagement>

   <dependencies>
      <dependency>
         <groupId>io.quarkus</groupId>
         <artifactId>quarkus-resteasy-jsonb</artifactId>
      </dependency>

      <dependency>
         <groupId>io.quarkus</groupId>
         <artifactId>quarkus-hibernate-orm</artifactId>
      </dependency>
      <dependency>
         <groupId>io.quarkiverse.freemarker</groupId>
         <artifactId>quarkus-freemarker</artifactId>
         <version>0.2.7</version>
      </dependency>
      <dependency>
         <groupId>io.quarkus</groupId>
         <artifactId>quarkus-jdbc-h2</artifactId>
      </dependency>
      <dependency>
         <groupId>io.quarkus</groupId>
         <artifactId>quarkus-junit5</artifactId>
         <scope>test</scope>
      </dependency>
      <dependency>
         <groupId>io.rest-assured</groupId>
         <artifactId>rest-assured</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>io.quarkus</groupId>
            <artifactId>quarkus-maven-plugin</artifactId>
            <version>${quarkus-plugin.version}</version>
            <executions>
               <execution>
                  <goals>
                     <goal>build</goal>
                  </goals>
               </execution>
            </executions>
         </plugin>
         <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>${compiler-plugin.version}</version>
         </plugin>
         <plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>${surefire-plugin.version}</version>
            <configuration>
               <systemProperties>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
               </systemProperties>
            </configuration>
         </plugin>
      </plugins>
   </build>

   <profiles>
      <profile>
         <id>native</id>
         <activation>
            <property>
               <name>native</name>
            </property>
         </activation>
         <build>
            <plugins>
               <plugin>
                  <artifactId>maven-failsafe-plugin</artifactId>
                  <version>${surefire-plugin.version}</version>
                  <executions>
                     <execution>
                        <goals>
                           <goal>integration-test</goal>
                           <goal>verify</goal>
                        </goals>
                        <configuration>
                           <systemProperties>
<native.image.path>${project.build.directory}/${project.build.finalName}-runner</native.image.path>
                           </systemProperties>
                        </configuration>
                     </execution>
                  </executions>
               </plugin>
            </plugins>
         </build>
         <properties>
            <quarkus.package.type>native</quarkus.package.type>
         </properties>
      </profile>
   </profiles>
</project>

application.properties

# datasource configuration
quarkus.datasource.db-kind = h2
quarkus.datasource.username = sa
# quarkus.datasource.password =
quarkus.datasource.jdbc.url = jdbc:h2:mem:test

# drop and create the database at startup (use `update` to only update the schema)
quarkus.hibernate-orm.database.generation=drop-and-create

Create the Entity class

package com.knf.dev;

import javax.persistence.*;
import java.io.Serializable;

@Table(name = "users")
@Entity
public class User implements Serializable {
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private Long id;
   private String firstName;
   private String lastName;
   private String email;


   public User(Long id, String firstName, String lastName, String email) {
      super();
      this.id = id;
      this.firstName = firstName;
      this.lastName = lastName;
      this.email = email;
   }

   public Long getId() {
      return id;
   }

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

   public String getFirstName() {
      return firstName;
   }

   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }

   public String getLastName() {
      return lastName;
   }

   public void setLastName(String lastName) {
      this.lastName = lastName;
   }

   public String getEmail() {
      return email;
   }

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

   public User() {
      super();
   }

}

Create CRUD Repository

package com.knf.dev;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.persistence.EntityManager;
import javax.transaction.Transactional;
import java.util.List;

@Singleton
public class UserResource {

   @Inject
   EntityManager entityManager;

   public List<User> getUsers() {
      return entityManager.createQuery("SELECT c FROM User c").getResultList();
   }

   public User getUser(Long id) {
      return entityManager.find(User.class, id);
   }

   @Transactional(Transactional.TxType.REQUIRED)
   public User addUser(User user) {
      entityManager.persist(user);
      return user;
   }

   @Transactional(Transactional.TxType.REQUIRED)
   public void updateUser(User user) {
      entityManager.merge(user);
   }

   @Transactional(Transactional.TxType.REQUIRED)
   public void deleteUser(Long id) {
      User user = getUser(id);
      entityManager.remove(user);
   }
}

Create the UserEndPoint class

package com.knf.dev;

import freemarker.template.Template;
import freemarker.template.TemplateException;
import io.quarkiverse.freemarker.TemplatePath;

import javax.inject.Inject;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Path("/")
public class UserEndpoint {

    @Inject
    @TemplatePath("home.ftlh")
    Template home;

    @Inject
    @TemplatePath("create-update.ftlh")
    Template creatUpdate;

    @Inject
    UserResource userResource;

    @GET
    @Produces(MediaType.TEXT_HTML)
    public String getAllUserView()
            throws TemplateException, IOException {
        List<User> users = userResource.getUsers();
        StringWriter stringWriter = new StringWriter();
        home.process(Map.of("users", users), stringWriter);
        return stringWriter.toString();
    }

    @GET
    @Path("/create")
    @Produces(MediaType.TEXT_HTML)
    public String createUserView()
            throws TemplateException, IOException {
        User user = new User();
        Map<String, Object> obj = new HashMap<>();
        StringWriter stringWriter = new StringWriter();
        obj.put("user", user);
        obj.put("isUpdate", false);
        creatUpdate.process(obj, stringWriter);
        return stringWriter.toString();
    }

    @POST
    @Produces(MediaType.TEXT_HTML)
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Path("/create")
    public String createUser
            (@FormParam("firstName") String firstName,
             @FormParam("lastName") String
                     lastName, @FormParam("email") String email)
            throws TemplateException, IOException {
        User usr = new User();
        usr.setEmail(email);
        usr.setFirstName(firstName);
        usr.setLastName(lastName);
        userResource.addUser(usr);
        return getAllUserView();
    }

    @GET
    @Produces(MediaType.TEXT_HTML)
    @Path("/update/{id}")
    public String updateUser(@PathParam("id") Long id)
            throws TemplateException, IOException {
        User user = userResource.getUser(id);
        Map<String, Object> obj = new HashMap<>();
        StringWriter stringWriter = new StringWriter();
        obj.put("user", user);
        obj.put("isUpdate", true);
        creatUpdate.process(obj, stringWriter);
        return stringWriter.toString();
    }

    @POST
    @Path("/update/{id}")
    @Produces(MediaType.TEXT_HTML)
    public String createUser(@FormParam("firstName") String firstName,
                             @FormParam("lastName") String
                                     lastName, @FormParam("email")
                                         String email,
                             @PathParam("id") Long id)
            throws TemplateException, IOException {
        User usr = new User();
        usr.setEmail(email);
        usr.setFirstName(firstName);
        usr.setLastName(lastName);
        usr.setId(id);
        userResource.updateUser(usr);
        return getAllUserView();
    }

    @GET
    @Produces(MediaType.TEXT_HTML)
    @Path("/delete/{id}")
    public String deleteUser(@PathParam("id") Long id)
            throws TemplateException, IOException {
        userResource.deleteUser(id);
        return getAllUserView();
    }
}

Creating FreeMarker templates

home.ftlh

<!doctype html>
<head>
    <title>Freemarker Example</title>
    <meta charset="utf-8">
    <meta content="width=device-width, initial-scale=1" name="viewport">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          rel="stylesheet">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
    </script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
    </script>
</head>
<body>
<div class="container">
            <h2>User CRUD operation with Quarkus + Freemarker Template</h2>
     <a href="/create" class="btn btn-primary" role="button">Create New User</a>
    <table class="table">
        <thead >
        <tr>
            <th scope="col">Id</th>
            <th scope="col">First Name</th>
            <th scope="col">Last Name</th>
            <th scope="col">Email</th>
            <th scope="col"></th>
            <th scope="col"></th>
        </tr>
        </thead>
        <tbody>
        <#list users as user>
        <tr>
            <th scope="row">${user.id}</th>
            <td>${user.firstName}</td>
            <td>${user.lastName}</td>
            <td>${user.email}</td>
            <td><a href="/update/${user.id}" class="btn btn-warning" role="button">
                     Update</a></td>
            <td><a href="/delete/${user.id}" class="btn btn-danger" role="button">
                     Delete</a></td>
        </tr>
        </#list>
        </tbody>
    </table>
</div>
</body>
</html>

create-update.ftlh

<!doctype html>
<head>
    <title>Freemarker Example</title>
    <meta charset="utf-8">
    <meta content="width=device-width, initial-scale=1" name="viewport">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
          rel="stylesheet">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
    </script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js">
    </script>
</head>
<body>
<div class="container">
            <h2>
                <#if !isUpdate>Create</#if>
            <#if isUpdate>Update</#if>
        User
        </h2>
<div>
    <form action="<#if isUpdate>/update/${user.id}</#if><#if !isUpdate>/create</#if>"
          method="post" name="user">
        <table class="table">
            <tbody>
            <thead>
            <tr>
                <th>Field</th>
                <th>Value</th>
            </tr>
            </thead>
            <tbody>
            <#if isUpdate>
            <tr>
                <th>ID</th>
                <td>
                    <div name="id">${user.id}</div>
                </td>
            </tr>
            </#if>
            <tr>
                <th>First Name</th>
                <td><input name="firstName" type="text"
                           value="<#if user.firstName??>${user.firstName}</#if>"/>
                                                    </td>
            </tr>
            <tr>
                <th>Last Name</th>
                <td><input name="lastName" type="text"
                           value="<#if user.lastName??>${user.lastName}</#if>"/></td>
            </tr>
            <tr>
                <th>Email</th>
                <td><input name="email" type="text"
                           value="<#if user.email??>${user.email}</#if>"/></td>
            </tr>
            </tbody>
        </table>
        <button class="btn btn-primary" type="submit">Save</button>
    </form>
</div>
</div>
</body>
</html>

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