File Name: spring aop interview questions and answers .zip
The canonical reference for building a production grade API with Spring. If you have a few years of experience in the Java ecosystem, and you're interested in sharing that experience with the community and getting paid for your work of course , have a look at the "Write for Us" page.
Cheers, Eugen. In this article, we're going to look at some of the most common Spring-related questions that might pop up during a job interview. Spring is the most broadly used framework for the development of Java Enterprise Edition applications. The core features of Spring can be used in developing any Java application. We can use its extensions for building various web applications on top of the Jakarta EE platform, or we may just use its dependency injection provisions in simple standalone applications.
Dependency Injection, an aspect of Inversion of Control IoC , is a general concept stating that you do not create your objects manually but instead describe how they should be created. An IoC container will instantiate required classes if needed. For more details, please refer here. For more details, check this article.
The recommended approach is to use constructor arguments for mandatory dependencies and setters for optional ones. Constructor injection allows injecting values to immutable fields and makes testing easier. BeanFactory is an interface representing a container that provides and manages bean instances. The default implementation instantiates beans lazily when getBean is called. ApplicationContext is an interface representing a container holding all information, metadata, and beans in the application.
It also extends the BeanFactory interface but the default implementation instantiates beans eagerly when the application starts. This behavior can be overridden for individual beans. For all differences, please refer to the reference. There are five supported scopes:. For differences, please refer here. No, singleton beans are not thread-safe, as thread safety is about execution, whereas the singleton is a design pattern focusing on creation. Thread safety depends only on the bean implementation itself.
It may also be required to perform some initialization to get it into a usable state. After that, when the bean is no longer required, it will be removed from the IoC container.
The whole cycle with all initialization methods is shown on the image source :. It's one of the ways of configuring Spring-based applications in a type-safe manner. It's an alternative to the XML-based configuration. Also, if you want to migrate your project from XML to Java config, please refer to this article.
Yes, in large projects, having multiple Spring configurations is recommended to increase maintainability and modularity. Spring Security is a separate module of the Spring framework that focuses on providing authentication and authorization methods in Java applications.
It also takes care of most of the common security vulnerabilities such as CSRF attacks. To use Spring Security in web applications, you can get started with a simple annotation: EnableWebSecurity. You can find the whole series of articles related to security on Baeldung. Spring Boot is a project that provides a pre-configured set of frameworks to reduce boilerplate configuration so that you can have a Spring application up and running with the smallest amount of code. Scope prototype means that every time you call for an instance of the Bean, Spring will create a new instance and return it.
This differs from the default singleton scope, where a single object instance is instantiated once per Spring IoC container. Simply put, all the requests processed by the DispatcherServlet are directed to classes annotated with Controller. Each controller class maps one or more requests to methods that process and execute the requests with provided inputs.
If you need to take a step back, we recommend having a look at the concept of the Front Controller in the typical Spring MVC architecture. The RequestMapping annotation is used to map web requests to Spring Controller methods.
More details on RequestMapping are available here. For further explanation, you can go through this quick article. There are two distinct ways to configure Transactions — with annotations or by using Aspect Oriented Programming AOP — each with their advantages. The benefits of using Spring Transactions, according to the official docs , are:. You can, of course, go more in-depth on persistence, with the entire series discussing persistence in Spring. Aspects enable the modularization of cross-cutting concerns such as transaction management that span multiple types and objects by adding extra behavior to already existing code without modifying affected classes.
According to the official docs , weaving is a process that links aspects with other application types or objects to create an advised object. This can be done at compile time, load time, or at runtime. Reactive programming is about non-blocking, event-driven applications that scale with a small number of threads, with back pressure being a key ingredient that aims to ensure producers don't overwhelm consumers.
Thus, using reactive programming does not mean we're building a reactive system, which is an architectural style. In order to achieve this reactive model and be highly scalable, the entire stack is non-blocking. Check out our tutorial on Spring 5 WebFlux for additional details. By definition, the two types represent streams, hence they're both lazy, which means nothing is executed until we consume the stream using the subscribe method.
Both types are immutable, therefore calling any method will return a new instance of Flux or Mono. Being a reactive client, it can handle reactive streams with back pressure, and it can take full advantage of Java 8 lambdas. It can also handle both sync and async scenarios. Basically, it's a thin shell around the WebClient.
It can connect to any server over an HTTP connection. It can also bind directly to WebFlux applications using mock request and response objects, without the need for an HTTP server. This means older versions of Java cannot be used. Hence, the framework requires a minimum of Java 8. In Spring 5, everything has been modularized, thus we won't be forced to import jars that may not have the functionalities we're looking for.
Let's see an example to understand the new module functionality in Java 9 and how to organize a Spring 5 project based on this concept. Moreover, MVC is a blocking paradigm and WebFlux is a non-blocking style, therefore we shouldn't be mixing both together, as they serve different purposes. Persistence The Persistence with Spring guides. Security The Spring Security guides. Full Archive The high level overview of all the articles on the site. Baeldung Ebooks Discover all of our eBooks.
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It is the execution of an aspect. Advice is like making your application learn a new trick. They are usually introduced at joinpoints. The default scope of bean is Singleton for Spring framework. Transaction management supported by Spring are : Declarative transaction management.
Are you looking for spring Aop job? Need interview questions for preparation? Find the spring Aop job interview questions and answers on wisdom jobs career edge for your interview success. Spring framework has various examples like logging, auditing, declarative transactions, security, caching, etc. Various spring AOP jobs include sr. Having experience on Java along with Application framework i. Spring and Hibernate will help you to gain an edge in your career path.
Spring is largely a redundancy. Java EE 6 provides what you are likely to need from Spring a standards compliant framework. If you are still doing J2EE development I can understand why you think Spring is the better framework, however. Thanks Thomas you like these spring questions, and thanks for explaining that point some how I completely missed that. Can you add some more Spring framework interview questions , especially from spring mvc part. I am going for spring interview and expecting spring mvc interview questions based on job description.
Spring AOP Interview Questions · 2. What is a pointcut, a join point, an advice, an aspect, weaving, Introduction, Target Object, AOP Proxy?
Spring interview questions and answers are frequently asked because it is now widely used framework to develop enterprise application in java. There are given a list of top 40 frequently asked spring interview questions. It is a lightweight, loosely coupled and integrated framework for developing enterprise applications in java. It removes the dependency from the program.
Name some of the design patterns used in Spring Framework? Spring Framework is using a lot of design patterns, some of the common ones are: Singleton Pattern: Creating beans with default scope. What is Spring DAO? How to integrate Spring and Hibernate Frameworks? Also, Spring ORM provides support for using Spring declarative transaction management, so you should utilize that rather than going for hibernating boiler-plate code for transaction management.
The canonical reference for building a production grade API with Spring. If you have a few years of experience in the Java ecosystem, and you're interested in sharing that experience with the community and getting paid for your work of course , have a look at the "Write for Us" page. Cheers, Eugen. In this article, we're going to look at some of the most common Spring-related questions that might pop up during a job interview.
Again, please feel free to suggest new questions which are not part of this post so I can include them to benefit larger audience. Some aspects have centralized code but other aspects may be scattered or tangled e. These scattered aspects are called cross-cutting concern.
I have posted a lot of Spring Tutorials recently. This post will help you get through Spring interview Questions explaining the core concepts in detail. Spring Framework is one of the most popular Java EE frameworks for web applications. If you are good in Spring Framework, the chances of getting selected get high. Spring is one of the most widely used Java EE framework. Spring framework can be used in normal java applications also to achieve loose coupling between different components by implementing dependency injection and we can perform cross-cutting tasks such as logging and authentication using spring support for aspect-oriented programming.
It provides powerful to the cross cutting concern area into application. What is the concept of AOP? Which problem does it solve? Aspect-Oriented Programming AOP enables modularization of cross-cutting concerns to solve following problems. Pointcut — An expression that selects one or more Join Points Join Point — A point in the execution of a program such as a method call or exception thrown Advice — Code to be executed at each selected Join Point Aspect — A module that encapsulates pointcuts and advice Weaving — Technique by which aspects are combined with main code Introduction -Spring AOP allows to introduce new interfaces and a corresponding application to any object advises. Target Object -An object is assisted by one or more respects. Also known as the object advised.
+ Spring Aop Interview Questions and Answers, Question1: What is a pointcut, a join point, an advice, an aspect, weaving, Introduction, Target Object, AOP.
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