Computer Knowledge

Java Enterprise and Web Technologies

2,183 Questions

Java enterprise and web technologies questions focus on J2EE architecture, web services like SOAP, and servlet functionalities. These topics frequently appear in IT officer and specialist scale examinations. Regular practice ensures familiarity with enterprise application components.

HttpServlet methodsSOAP and web servicesEJB architecture rolesJ2EE componentsJSP servlet callingUDDI concepts

Java Enterprise and Web Technologies Questions

Multiple choice

Which of the following is NOT a common pattern used for data fetching in SPAs?

  1. AJAX requests

  2. WebSockets

  3. Server-sent events

  4. Local Storage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Local Storage is a browser-based API for storing data locally, while AJAX requests, WebSockets, and server-sent events are techniques for fetching data from a server.

Multiple choice

Which of the following is NOT a common approach for handling authentication and authorization in SPAs?

  1. JSON Web Tokens (JWT)

  2. OAuth2

  3. Cookies

  4. Local Storage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Local Storage is a browser-based API for storing data locally, while JSON Web Tokens (JWT), OAuth2, and Cookies are commonly used mechanisms for handling authentication and authorization in SPAs.

Multiple choice

What is the difference between a web server and an application server?

  1. A web server serves static content, while an application server serves dynamic content

  2. A web server uses HTTP to communicate with clients, while an application server uses a variety of protocols to communicate with clients

  3. A web server is typically located in a DMZ, while an application server is typically located in a private network

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A web server serves static content, while an application server serves dynamic content. A web server uses HTTP to communicate with clients, while an application server uses a variety of protocols to communicate with clients. A web server is typically located in a DMZ, while an application server is typically located in a private network.

Multiple choice

Which architectural pattern involves dividing an application into multiple components that communicate through well-defined interfaces?

  1. Layered Architecture

  2. Microservices Architecture

  3. Component-Based Architecture

  4. Event-Driven Architecture
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Component-Based Architecture is an architectural pattern where an application is divided into multiple components that communicate through well-defined interfaces, promoting modularity and reusability.

Multiple choice

What is the role of a web server in web application development?

  1. To store and manage web application files

  2. To process and respond to client requests

  3. To generate dynamic content for web pages

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A web server performs multiple tasks, including storing and managing web application files, processing and responding to client requests, and generating dynamic content for web pages.

Multiple choice

Which of the following is a common web application architecture pattern?

  1. Model-View-Controller (MVC)

  2. Model-View-Presenter (MVP)

  3. Model-View-ViewModel (MVVM)

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

MVC, MVP, and MVVM are all common web application architecture patterns that provide a structured approach to organizing and managing the different components of a web application.

Multiple choice

Which of the following is a common web application caching technique?

  1. Browser caching

  2. Server-side caching

  3. Database caching

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Browser caching, server-side caching, and database caching are all common web application caching techniques used to improve the performance and responsiveness of web applications by storing frequently accessed data in memory or on disk.

Multiple choice

What is the term used to describe the practice of writing code that responds to specific events in a serverless environment?

  1. Event-driven programming

  2. Asynchronous programming

  3. Reactive programming

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Event-driven programming is the practice of writing code that responds to specific events in a serverless environment, allowing applications to react to external stimuli and perform tasks accordingly.

Multiple choice

What is a Progressive Web Application (PWA)?

  1. A web application that can be installed on a mobile device

  2. A mobile app that is built using web technologies

  3. A website that is optimized for mobile devices

  4. A web application that can be accessed offline
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PWAs are web applications that can be installed on a mobile device, just like a native app. They can be accessed offline, and they can use features like push notifications and location tracking.

Multiple choice

Which framework is widely used for building web applications in Python?

  1. Django

  2. Flask

  3. Spring Boot

  4. Express.js
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Django is a high-level Python web framework that provides a comprehensive set of tools and features for rapid web development.

Multiple choice

Which framework is commonly used for building RESTful APIs in Node.js?

  1. Express.js

  2. Django

  3. Flask

  4. Spring Boot
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Express.js is a lightweight and flexible Node.js framework for building web applications and APIs.

Multiple choice

Which framework is commonly used for building web applications in C#?

  1. Django

  2. Flask

  3. ASP.NET Core

  4. Express.js
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ASP.NET Core is a cross-platform, open-source framework for building modern web applications using C#.

Multiple choice

Which of the following is a popular framework for developing Microservices?

  1. Spring Boot

  2. .NET Core

  3. Node.js

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Spring Boot, .NET Core, and Node.js are widely used frameworks for developing Microservices, providing comprehensive features and tools for building, deploying, and managing Microservices applications.

Multiple choice

What is the purpose of a service in Angular?

  1. To provide reusable functionality across components

  2. To manage state and data

  3. To handle user input and events

  4. To perform HTTP requests
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Services in Angular are used to provide reusable functionality that can be shared across multiple components. This helps in reducing code duplication and improving maintainability.

Multiple choice

What is the purpose of the HttpClient module in Angular?

  1. To perform HTTP requests

  2. To handle user input and events

  3. To manage state and data

  4. To create custom HTML elements
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The HttpClient module in Angular is used to perform HTTP requests and fetch data from remote servers. It provides a simplified and type-safe way to make HTTP requests and handle responses.