Java Enterprise and Web Technologies

This method of a servlet is invoked once per a request and is responsible for generating the response to that request.

It is employed to combat overhead costs associated with remote executions.

It means that the container shares instance of EJB beans among multiple clients.

The bean requires that the client must have a transaction open before the client attempts to use the bean.

It returns the value of the specified request header as an numeric form.

If the client has transaction open when it invokes the beans method, the bean runs the client's transaction context.

Java applications are typically bundled into JAR (Java Archive) files for distribution.

API stands for Application Programming Interface, a set of definitions and protocols for building and integrating application software.

ASP stands for Application Service Provider, a business that provides computer-based services to customers over a network.

In the MVC architectural pattern, the Model component is responsible for managing the application's business logic. It encapsulates the data and the operations that can be performed on that data. The Model is typically independent of the View and the Controller, allowing for easier maintenance and testing.

Model-View-ViewModel (MVVM) is an architectural pattern commonly used in mobile applications to manage state and provide data to the user interface. MVVM separates the application into three distinct layers: the Model, the View, and the ViewModel. The ViewModel acts as an intermediary between the Model and the View, exposing data and functionality to the View in a way that is easy to consume. This pattern promotes a clean separation of concerns, making it easier to maintain and test the application.

The Repository Pattern is commonly used in mobile applications to handle data persistence and synchronization. It provides an abstraction layer between the application and the data source, allowing developers to work with data in a consistent and efficient manner. The Repository Pattern encapsulates the logic for data access, caching, and synchronization, making it easier to manage and maintain the application's data layer.

The Event Bus architectural pattern is commonly used in mobile applications to handle communication between different components. It provides a central hub or bus through which components can publish and subscribe to events. When an event is published, all subscribed components are notified and can react accordingly. This pattern facilitates loose coupling between components, making it easier to maintain and extend the application. Event Bus also enables asynchronous communication, allowing components to communicate without blocking each other.

Redux is a popular state management library for SPAs, providing a centralized store for application state and a predictable way to update it.

Express.js is a server-side framework, while React Router, Angular Router, and Vue Router are client-side routing libraries specifically designed for SPAs.