Metso Outotec Interview Questions and Answers

Dependency injection is a design pattern used in Spring Boot to manage object dependencies.

• Dependency injection allows objects to be created and managed by a framework rather than by the application itself.

• It helps to reduce coupling between classes and makes code more modular and testable.

• In Spring Boot, dependencies can be injected using constructor injection, setter injection, or field injection.

• Example: @Autowired annotation is used to inject dependencies in Spring Boot.

• E...read more

JPA is a specification for ORM in Java, while ORM is a technique for mapping objects to relational databases.

• JPA is a Java specification for ORM, while ORM is a technique for mapping objects to relational databases

• ORM is a general concept, while JPA is a specific implementation of ORM for Java

• JPA provides a set of interfaces and annotations for mapping Java objects to relational databases

• ORM frameworks like Hibernate, TopLink, and iBatis can be used with JPA

An IOC container is a software component that manages the dependencies between objects.

• IOC stands for Inversion of Control

• It is used to decouple the application components

• It creates and manages objects and their dependencies

• It allows for easy testing and maintenance of the application

• Examples of IOC containers include Spring, Unity, and Autofac

Hibernate is an ORM tool and JPA is a specification for ORM.

• Hibernate is an open-source ORM tool that maps Java classes to database tables.

• JPA is a specification for ORM that defines a set of interfaces and rules for ORM tools to follow.

• Hibernate implements the JPA specification and provides additional features.

• Hibernate and JPA simplify database access by abstracting away SQL queries and providing a more object-oriented approach.

• Example: Hibernate can be used to map a Java c...read more

Hooks are functions that allow you to use state and other React features without writing a class.

• Introduced in React 16.8

• Used to reuse stateful logic

• useState, useEffect, useContext are some built-in hooks

• Custom hooks can be created for specific use cases