Spring Boot + Angular + MongoDB CRUD example

Hello everyone, today we will learn how to develop a Full-stack web application that is a basic User Management Application using MongoDB, Spring Boot, and Angular 10. The GitHub repository link is provided at the end of this tutorial. You can download the source code.


-Add User:



-Retrieve all Users:



-User by ID:


-Update User:


We divided this tutorial into two parts. 

PART 1 - Restful API Development with Spring Boot 
PART 2 - UI development using Angular 10 

PART 1 - Restful API Development with Spring Boot 

These are APIs that Spring backend App will export:


Backend project structure



Maven[pom.xml]

A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details utilized by Maven to build the project.
<?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>2.1.1.RELEASE</version>
    <relativePath /> 
  </parent>
  <groupId>com.example</groupId>
  <artifactId>springboot_angular_mongodb_crud</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springboot_angular_mongodb_crud</name>
  <description>Demo project for Spring Boot</description>
  <properties>
    <java.version>11</java.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </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>


application.properties

spring.data.mongodb.uri=mongodb://localhost:27017/user-dev



Create User Document

package com.knf.dev.document;

import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection = "database_sequences")
public class User {

    private String _id;
    private String firstName;
    private String lastName;
    private String emailId;
    public String getId() {
        return _id;
    }
    public void setId(String _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 getEmailId() {
        return emailId;
    }
    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }
  public User(String _id, String firstName, 
            String lastName, String emailId) {
        super();
        this._id = _id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.emailId = emailId;
    }
    public User() {
        super();
    }
}


Create a User Repository

package com.knf.dev.repository;

import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
import com.knf.dev.document.User;

@Repository
public interface UserRepository 
         extends MongoRepository<User, String> {

}


Create User Controller

package com.knf.dev.controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
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.knf.dev.ResourceNotFoundException.ResourceNotFoundException;
import com.knf.dev.document.User;
import com.knf.dev.repository.UserRepository;

@RestController
@CrossOrigin(origins = "http://localhost:4200")
@RequestMapping("/api/v1")
public class UserController {
    @Autowired
    private UserRepository userRepository;

    @GetMapping("/users")
    public List<User> getAllUsers() {

        return userRepository.findAll();
    }

    @GetMapping("/users/{id}")
    public ResponseEntity<User> getUserById
       (@PathVariable(value = "id") 
            String id) throws ResourceNotFoundException {

        User user = userRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                    ("User not found for this id :: " + id));
        return ResponseEntity.ok().body(user);
    }

    @PostMapping("/users")
    public User createUser(@Valid @RequestBody User user) {
        return userRepository.save(user);
    }

    @PutMapping("/users/{id}")
    public ResponseEntity<User> updateUser
            (@PathVariable(value = "id") 
                       String id, @Valid @RequestBody User userDto)

            throws ResourceNotFoundException {
        User user = userRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException
                      ("User not found for this id :: " + id));

        user.setEmailId(userDto.getEmailId());
        user.setLastName(userDto.getLastName());
        user.setFirstName(userDto.getFirstName());
        user.setId(id);
        final User updateUser = userRepository.save(user);
        return ResponseEntity.ok(updateUser);
    }

    @DeleteMapping("/users/{_id}")
    public Map<String, Boolean> deleteUser
      (@PathVariable(value = "_id") 
         String id) throws ResourceNotFoundException {

        User user = userRepository.findById(id)
               .orElseThrow(() -> new ResourceNotFoundException
                     ("User not found for this id :: " + id));

        userRepository.delete(user);
        Map<String, Boolean> response = new HashMap<>();
        response.put("deleted", Boolean.TRUE);
        return response;
    }
}


Spring Boot Main Driver

package com.knf.dev;

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

@SpringBootApplication
public class SpringbootAngularMongodbCrudApplication {

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



PART 2 - UI development using Angular

Project Structure




The package.json

A package.json is a JSON file that subsists at the root of a Javascript/Node project. It holds metadata pertinent to the project and is utilized for managing the project's dependencies, scripts, version, and a whole lot more.
{
  "name": "front-end-simple-crud",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~10.1.2",
    "@angular/common": "~10.1.2",
    "@angular/compiler": "~10.1.2",
    "@angular/core": "~10.1.2",
    "@angular/forms": "~10.1.2",
    "@angular/platform-browser": "~10.1.2",
    "@angular/platform-browser-dynamic": "~10.1.2",
    "@angular/router": "~10.1.2",
    "bootstrap": "^4.5.3",
    "jquery": "^3.5.1",
    "rxjs": "~6.6.0",
    "tslib": "^2.0.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^0.1100.3",
    "@angular/cli": "~10.1.2",
    "@angular/compiler-cli": "~10.1.2",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.11.1",
    "codelyzer": "^6.0.0",
    "jasmine-core": "~3.6.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~5.0.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~3.0.2",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "^1.5.0",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.0.2"
  }
}


The User.ts file(User Model)

Path - src/app/user.ts 

Before defining the UserListComponent, let’s define a User class for working with users. create a new file user.ts inside the src/app folder and add the following code to it -
export class User {
    _id: string;
    firstName: string;
    lastName: string;
    emailId: string;
    active: boolean;

}


User List Component

Let's create the UserListComponent component which will be used to display a list of users, create a new user, and delete a user.

Path - src/app/user-list/user-list.component.ts
import { UserDetailsComponent } from '../user-details/user-details.component';
import { Observable } from "rxjs";
import { UserService } from "../user.service";
import { User } from "../user";
import { Component, OnInit } from "@angular/core";
import { Router } from '@angular/router';

@Component({
  selector: "app-user-list",
  templateUrl: "./user-list.component.html",
  styleUrls: ["./user-list.component.css"]
})
export class UserListComponent implements OnInit {
  users: Observable<User[]>;

  constructor(private userService: UserService,
    private router: Router) { }

  ngOnInit() {
    this.reloadData();
  }

  reloadData() {
    this.users = this.userService.getUsersList();
  }

  deleteUser(_id: string) {
    this.userService.deleteUser(_id)
      .subscribe(
        data => {
          console.log(data);
          this.reloadData();
        },
        error => console.log(error));
  }
  updateUser(id: string) {
    this.router.navigate(['update', id]);
  }
  userDetails(_id: string) {
    this.router.navigate(['details', _id]);
  }
}


User List Template

Path - src/app/user-list/user-list.component.html
Add user-list.component.html file with the following code to it -
<div class="panel panel-primary">
  <div class="panel-heading">
    <h2>User List</h2>
  </div>
  <div class="panel-body">
    <table class="table table-striped">
      <thead>
        <tr>
          <th>Firstname</th>
          <th>Lastname</th>
          <th>Email</th>
          <th>Actions</th>
        </tr>
      </thead>
      <tbody>
        <tr *ngFor="let user of users | async">
          <td>{{user.firstName}}</td>
          <td>{{user.lastName}}</td>
          <td>{{user.emailId}}</td>
          <td>
     <button (click)="updateUser(user.id)" class="btn btn-warning" 
style="margin-left: 10px">Update</button>
     <button (click)="deleteUser(user.id)" class="btn btn-danger" 
style="margin-left: 10px">Delete</button>
     <button (click)="userDetails(user.id)" class="btn btn-info" 
style="margin-left: 10px">Details</button>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</div>


Add User Component

Path - src/app/create-user/create-user.component.ts

CreateUserComponent is used to create and handle new user form data. Add the following code to it -
import { UserService } from '../user.service';
import { User } from '../user';
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  selector: 'app-create-user',
  templateUrl: './create-user.component.html',
  styleUrls: ['./create-user.component.css']
})
export class CreateUserComponent implements OnInit {

  user: User = new User();
  submitted = false;

  constructor(private userService: UserService,
    private router: Router) { }

  ngOnInit() {
  }

  newUser(): void {
    this.submitted = false;
    this.user = new User();
  }

  save() {
    this.userService
      .createUser(this.user).subscribe(data => {
        console.log(data)
        this.user = new User();
        this.gotoList();
      },
        error => console.log(error));
  }

  onSubmit() {
    this.submitted = true;
    this.save();
  }

  gotoList() {
    this.router.navigate(['/users']);
  }
}


Create a User Template

The create-user.component.html shows the add using HTML form. Add the following code to it -

Path - src/app/create-user/create-user.component.html 
<h3>Create User</h3>
<div [hidden]="submitted" style="width: 400px;">
  <form (ngSubmit)="onSubmit()">
    <div class="form-group">
      <label for="name">First Name</label>
      <input type="text" class="form-control" id="firstName" 
required [(ngModel)]="user.firstName" name="firstName">
    </div>

    <div class="form-group">
      <label for="name">Last Name</label>
      <input type="text" class="form-control" id="lastName" 
required [(ngModel)]="user.lastName" name="lastName">
    </div>

    <div class="form-group">
      <label for="name">Email Id</label>
      <input type="text" class="form-control" id="emailId" 
required [(ngModel)]="user.emailId" name="emailId">
    </div>

    <button type="submit" class="btn btn-danger">Submit</button>
  </form>
</div>

<div [hidden]="!submitted">
  <h4>Successfully submitted!</h4>
</div>


Update User Component

Path - src/app/update-user/update-user.component.ts 

UpdateUserComponent is used to update an existing user.
import { Component, OnInit } from '@angular/core';
import { User } from '../user';
import { ActivatedRoute, Router } from '@angular/router';
import { UserService } from '../user.service';

@Component({
  selector: 'app-update-user',
  templateUrl: './update-user.component.html',
  styleUrls: ['./update-user.component.css']
})
export class UpdateUserComponent implements OnInit {

  _id: string;
  user: User;

  constructor(private route: ActivatedRoute, private router: Router,
    private userService: UserService) { }

  ngOnInit() {
    this.user = new User();

    this._id = this.route.snapshot.params['_id'];

    this.userService.getUser(this._id)
      .subscribe(data => {
        this.user = data;
      }, error => console.log(error));
  }

  updateUser() {
    this.userService.updateUser(this._id, this.user)
      .subscribe(data => {
        console.log(data);
        this.user = new User();
        this.gotoList();
      }, error => console.log(error));
  }

  onSubmit() {
    this.updateUser();
  }

  gotoList() {
    this.router.navigate(['/users']);
  }
}


Update User Template

Path - src/app/update-user/update-user.component.html 

The update-user.component.html shows the updated user HTML form. Add the following code to this file -
<h3>Update User</h3>
<div  style="width: 500px;">
  <form (ngSubmit)="onSubmit()">
    <div class="form-group">
      <label for="name">First Name</label>
      <input type="text" class="form-control" id="firstName" 
required [(ngModel)]="user.firstName" name="firstName">
    </div>

    <div class="form-group">
      <label for="name">Last Name</label>
      <input type="text" class="form-control" id="lastName" 
required [(ngModel)]="user.lastName" name="lastName">
    </div>

    <div class="form-group">
      <label for="name">Email Id</label>
      <input type="text" class="form-control" id="emailId" 
required [(ngModel)]="user.emailId" name="emailId">
    </div>

    <button type="submit" class="btn btn-success">Submit</button>
  </form>
</div>


User Details Component

Path - src/app/user-details/user-details.component.ts 

The UserDetailsComponent component is used to display a particular user detail. Add the following code to it -
import { User } from '../user';
import { Component, OnInit, Input } from '@angular/core';
import { UserService } from '../user.service';
import { Router, ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-user-details',
  templateUrl: './user-details.component.html',
  styleUrls: ['./user-details.component.css']
})
export class UserDetailsComponent implements OnInit {

  _id: string;
  user: User;

  constructor(private route: ActivatedRoute,private router: Router,
    private userService: UserService) { }

  ngOnInit() {
    this.user = new User();

    this._id = this.route.snapshot.params['_id'];
    console.log("gh"+this._id);
    this.userService.getUser(this._id)
      .subscribe(data => {
        console.log(data)
        this.user = data;
      }, error => console.log(error));
  }

  list(){
    this.router.navigate(['users']);
  }
}


User Details  Template

Path - src/app/user-details/user-details.component.html 

The user-details.component.html displays a particular user detail. Add the following code to it -
<h2>User Details</h2>

<hr />
<div *ngIf="user">
  <div>
    <label><b>First Name: </b></label> {{user.firstName}}
  </div>
  <div>
    <label><b>Last Name: </b></label> {{user.lastName}}
  </div>
  <div>
    <label><b>Email Id: </b></label> {{user.emailId}}
  </div>
</div>

<br>
<br>
<button (click)="list()" class="btn btn-primary">User List</button><br>



User Service

Path - src/app/user.service.ts 

The UserService will be used to get the data from the backend by calling  APIs. Update the user.service.ts file inside src/app directory with the following code to it -
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class UserService {

  private baseUrl = 'http://localhost:8000/api/v1/users';

  constructor(private http: HttpClient) { }

  getUser(_id: string): Observable<any> {
    return this.http.get(`${this.baseUrl}/${_id}`);
  }

  createUser(user: Object): Observable<Object> {
    return this.http.post(`${this.baseUrl}`, user);
  }

  updateUser(_id: string, value: any): Observable<Object> {
    return this.http.put(`${this.baseUrl}/${_id}`, value);
  }

  deleteUser(_id: string): Observable<any> {
    return this.http.delete(`${this.baseUrl}/${_id}`, 
           { responseType: 'text' });
  }

  getUsersList(): Observable<any> {
    return this.http.get(`${this.baseUrl}`);
  }
}


App Routing Module

Path: /src/app/app.routing.module.ts 

Routing for the Angular app is configured as an array of Routes, each component is mapped to a path so the Angular Router knows which component to display based on the URL in the browser address bar.
import { UserDetailsComponent } from './user-details/user-details.component';
import { CreateUserComponent } from './create-user/create-user.component';
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import {UserListComponent } from './user-list/user-list.component';
import { UpdateUserComponent } from './update-user/update-user.component';

const routes: Routes = [
  { path: '', redirectTo: 'user', pathMatch: 'full' },
  { path: 'users', component: UserListComponent },
  { path: 'add', component: CreateUserComponent },
  { path: 'update/:_id', component: UpdateUserComponent },
  { path: 'details/:_id', component: UserDetailsComponent },
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }


App Component

Path: /src/app/app.component.ts 

The app component is the root component of the application, it defines the root tag of the app as with the selector property of the @Component decorator.
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Angular 10 + Spring Boot + Mongo DB CRUD ';
}


App Component Template

Path: /src/app/app.component.html 

Defines the HTML template associated with the root AppComponent.
<nav class="navbar navbar-expand-sm bg-success navbar-dark">
  <!-- Links -->
  <ul class="navbar-nav">
    <li class="nav-item">
        <a routerLink="users" class="nav-link" routerLinkActive="active">
User List</a>
    </li>
    <li class="nav-item">
        <a routerLink="add" class="nav-link" routerLinkActive="active">
Add User</a>
    </li>
  </ul>
</nav>
<div class="container">
  <br>
  <h2 style="text-align: center;">{{title}}</h2>
  <hr>  
  <div class="card">
    <div class="card-body">
  <router-outlet></router-outlet>
    </div>
  </div>
</div>

<footer class="footer">
  <div class="container">
      <span>All Rights Reserved 2020 @Knowledge Factory</span>
  </div>
</footer>


App Module

Path: /src/app/app.module.ts 

Defines the root module, named AppModule, that tells Angular how to assemble the application. Initially declares only the AppComponent. 
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { CreateUserComponent } from './create-user/create-user.component';
import { UserDetailsComponent } from './user-details/user-details.component';
import { UserListComponent } from './user-list/user-list.component';
import { UpdateUserComponent } from './update-user/update-user.component';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
  declarations: [
    AppComponent,
    CreateUserComponent,
    UserDetailsComponent,
    UserListComponent,
    UpdateUserComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    FormsModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }


index.html

Path: /src/index.html 

The main index.html file is the initial page loaded by the browser that kicks everything off.
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Angular10CRUD</title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
  <app-root></app-root>
</body>
</html>


Main/Bootstrap File

Path: /src/main.ts

The main file is the entry point used by angular to launch and bootstrap the application.
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.error(err));



Local Setup and Run the application

Step 1: Install Mongo DB - Click here


Step 2: Download or clone the source code from GitHub to a local machine - Click here



Backend


Step 3: mvn clean install


Step 4: Run the Spring Boot application - mvn spring-boot:run



Frontend


Step 5: npm install 


Step 6: ng serve

From the browser call the endpoint http://localhost:4200/

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ReactJS - Bootstrap - Buttons

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Bootstrap is a free and open-source front-end development framework for the creation of websites and web apps. It is a free and open-source project, hosted on GitHub, and originally engendered by Twitter.  Let us create a new React app - click here After engendering the React app, the best way to install Bootstrap is via the npm package. To install Bootstrap, navigate to the React app folder, and run the following command. $ npm install react-bootstrap bootstrap --save Example import React from 'react' ; import Button from 'react-bootstrap/Button' ; import 'bootstrap/dist/css/bootstrap.min.css' ; class App extends React.Component { render() { return ( <div> <> <Button variant = "primary" > Primary </Button> { ' ' } <Button variant = "secondary" > Secondary </Button> { ' ' } <Butto
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Java - How to Count the Number of Occurrences of Substring in a String

In this section, we will write a Java program to Count the Number of Occurrences of Substring in a String. Java program to Count the Number of Occurrences of Substring in a String In the below program, we have countOccurrencesOf(String str, String sub) a generic method, here we simply pass input string and substring as arguments and method return number of occurrences of the substring. /** * * Java program to count number of occurrence of substring in given string. * @author knowledgefactory.net * */ public class Main { public static void main ( String [] args) { int count = countOccurrencesOf ( "javaknowledgefactoryjava" , "java" ); System . out .println( "Count number of occurrences of substring 'java' " + " in string 'javaknowledgefactoryjava' : " + count ); int count1 = countOccurrencesOf ( "javaknowledgefactoryjavajava" , "java" ); System .
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Spring Boot 3 + Spring Security 6 + Thymeleaf - Registration and Login Example

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In this section we will learn how to create user registration and login using Spring boot 3, Spring security 6, Thymeleaf, JPA, and PostgreSQL. The GitHub repository link is provided at the end of this tutorial. You can download the source code. What’s New in Spring Security 6? WebSecurityConfigurerAdapter Removed : The  WebSecurityConfigurerAdapter class was deprecated and then removed in Spring Security 6. Instead, you should now take a more component-based approach and create a bean of type  SecurityFilterChain . Here's an example: @Configuration @EnableWebSecurity public class SecurityConfiguration { @Bean public SecurityFilterChain securityFilterChain ( HttpSecurity http) throws Exception { http .authorizeHttpRequests((requests) -> requests .requestMatchers( "/registration**" ).permitAll() .anyRequest().authenticated() ) .formLogin((form) -> form
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Spring Core | BeanFactoryPostProcessor | Example

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In Spring, the  BeanFactoryPostProcessor is a  functional interface that contains a abstract method postProcessBeanFactory .   It allows us to modify the Spring context’s bean definitions before any beans get created.  BeanFactoryPostProcessor can create new bean definitions or modify existing ones. Since  BeanFactoryPostProcessor  should be called before other bean types are formed, it must be registered as a static method level. BeanFactoryPostProcessor example We are creating a simple maven project. You could clone the code from our GitHub repo. Final Project Directory 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 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion >4.0.0</ modelVersion > < gr
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Custom Exception Handling in Quarkus REST API

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In this section, we will learn how to handle exceptions in the Quarkus REST application using ExceptionMapper interface implementations. ExceptionMapper is a contract for a provider that will map a thrown application exception to a Response object. We will show you custom exception handling with the help of a simple application, Final  Project Directory: Complete pom.xml  <?xml version = "1.0" ?> <project     xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0     https://maven.apache.org/xsd/maven-4.0.0.xsd"     xmlns = "http://maven.apache.org/POM/4.0.0"     xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" >     <modelVersion> 4.0.0 </modelVersion>     <groupId> org.knf.dev.demo </groupId>     <artifactId> quarku-custom-exception-handling </artifactId>     <version> 1.0.0-SNAPSHOT </version>     <properties>         <compiler-plugin.version> 3.8.1 </compiler-
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File Upload, Download, And Delete - Azure Blob Storage + Spring Boot Example

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In this section, you will learn how to create  a storage account on Microsoft Azure and create a simple spring boot application to perform different file operations such as upload, download, and delete files from the Azure blob storage. A little bit of Background Azure Blob Storage Azure Blob storage is Microsoft's object storage solution for the cloud. Blob storage is optimized for storing massive amounts of unstructured data. Unstructured data is data that doesn't adhere to a particular data model or definition, such as text or binary data. More Info -  https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blobs-introduction Spring Boot Spring Boot makes it easy to create stand-alone, production-grade Spring-based Applications that you can "just run".  More Info -  https://spring.io/projects/spring-boot Create an Azure Storage Account and blob container using Azure Portal Sign in to Azure portal  https://portal.azure.com/#home  and search for " Storage a
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Java, Spring Boot Mini Project - Library Management System - Download

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Hello everyone, Hope you are doing well. Here, we provide a Library Management System mini-project for beginners, it's free for download. Maybe you can build more on top of this project and create your own product, that's all about you. The source code download link is provided at the end of this post. 1. Benefit of this project You could cover the following technologies and features by learning and debugging this mini project. Java 17 Java Stream Java Lamda Expressions Java Records Functional programming Object-oriented programming var Keyword in Java Generics in Java Java Switch Spring boot 2.6.4 Spring Security Thymeleaf template engine OpenCSV Spring Data JPA Server Side Pagination H2 Database  Bootstrap HTML CSS and more... 2. Objective Of Spring Boot On Library Management System The main objective of this project is to manage the details of the books, author, category, and publisher. Only Admin/Librarian will manage all these activities. Also, they can export the data in
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ReactJS, Spring Boot JWT Authentication Example

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In this tutorial, we’ll create a user registration & login example using ReactJS, Spring Boot, Spring Security, and JWT authentication. You could download the source code from our Github repository, the download link is provided at the end of this tutorial. Technologies used Backend Technologies: Java 17 Spring Boot 2.7.0 Spring Security Spring Data JPA JWT H2 Database Frontend Technologies: React 17.0.1 Axios 0.27.2 Redux 4.0.5 Bootstrap 4.5.2 ReactJS - SpringBoot - JWT - Flow Backend Project Directory: Frontend Project Directory: Following is the screenshot of our application - User Registration: User Signin: Profile View: Access Resource: We will build two projects:  1. Backend:   spring-boot-security-jwt 2. Frontend: react-redux-jwt Project 1: spring-boot-security-jwt 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"
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Top 5 Java ORM tools - 2024

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  The term ORM refers to object-relational mapping, which uses objects to adapt programming languages to database systems while allowing them to function with SQL and object-oriented programming ideas. Any kind of database management system that can accomplish object mapping to the table in the virtual system is suitable for the implementation of ORM. Java has a wide variety of ORM tools, some of which are mentioned below: 1. Hibernate Hibernate is a lightweight, open-source, non-invasive Java ORM (Object-Relational Mapping) framework that allows developers to create objects that function independently of database software and create persistence logic in any Java or JavaEE application. It offers an abstraction layer, so developers don't have to bother about implementations; Hibernate handles these tasks internally, such as connecting to databases and creating queries to carry out CRUD operations, among other things. Persistence logic development is done with it. Persistence logic r
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