File Name: interview questions and answers of spring in .zip
- Top 80 Spring MVC Framework Interview Questions & Answers
- Java Spring Interview Questions
- Spring interview questions
- Spring interview questions and answers
Ever since its release back in October of , Spring Framework has succeeded in becoming a top application framework for Java developers. In fact, it secures a place among the leading backend web development frameworks.
Top 80 Spring MVC Framework Interview Questions & Answers
I have tried to collect these spring interview questions which you may face into your next technical interview. For other spring modules, I will share interview questions and answers separately. I will really appreciate if you can suggest more similar spring interview questions which you have faced in your previous interviews and you consider them spring interview questions for experienced to be asked. I will add them in this list. This will be great help for fellow learners as well.
What is Spring Framework? What are the benefits of using Spring Framework? Explain IoC in Spring Framework? Difference between BeanFactory and ApplicationContext? In how many ways, you can configure Spring into our application? What is Spring Java-Based Configuration? What is Spring Annotation-based Configuration? Explain Spring Bean lifecycle? What are different Spring Bean Scopes? What are inner beans in Spring?
Are Singleton beans thread safe in Spring Framework? How can you inject a Java Collection in Spring? Give example? How to inject a java. Properties into a Spring Bean? Explain Spring Bean Autowiring? Explain different modes of bean autowiring?
How do you turn on annotation based autowiring? Explain Required annotation with example? Explain Autowired annotation with example? Explain Qualifier annotation with example? Difference between constructor injection and setter injection? What are the different types of events in spring framework? Name some of the design patterns used in Spring Framework?
The Spring framework is a Java platform that provides comprehensive infrastructure support for developing Java applications. Spring handles the infrastructure part so you can focus on your application part. Inside itself, Spring framework codifies formalized design patterns as first-class objects that you can integrate into your own application s without worrying too much about how they work in backend.
At present, Spring framework consists of features organized into about 20 modules. Read More : Spring Framework Tutorials. In software engineering, inversion of control IoC is a programming technique in which object coupling is bound at run time by an assembler object and is typically not known at compile time using static analysis.
In traditional programming, the flow of the business logic is determined by objects that are statically assigned to one another. With inversion of control, the flow depends on the object graph that is instantiated by the assembler and is made possible by object interactions being defined through abstractions. Inversion of control is a design paradigm with the goal of giving more control to the targeted components of your application, the ones that are actually doing the work.
Dependency injection is a pattern used to create instances of objects that other objects rely on without knowing at compile time which class will be used to provide that functionality.
Inversion of control relies on dependency injection because a mechanism is needed in order to activate the components providing the specific functionality. Otherwise how will the framework know which components to create if it is no longer in control? The org. The BeanFactory interface provides an advanced configuration mechanism capable of managing objects of any nature. BeanFactory is the actual representation of the Spring IoC container that is responsible for containing and otherwise managing the aforementioned beans.
A BeanFactory is like a factory class that contains a collection of beans. The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whenever asked for by clients. BeanFactory is able to create associations between collaborating objects as they are instantiated.
This removes the burden of configuration from bean itself and the beans client. BeanFactory also takes part in the life cycle of a bean, making calls to custom initialization and destruction methods.
On the surface, an application context is same as a bean factory. Both load bean definitions, wire beans together, and dispense beans upon request. But it also provides:. In Spring framework, dependencies and the services needed by beans are specified in configuration files, which are typically in an XML format. This means that there will not be present any other type of Spring Configuration like annotations or configuration via Java classes. A Spring XML Configuration uses Spring namespaces to make available the sets of XML tags used in the configuration; the main Spring namespaces are: context, beans, jdbc, tx, aop, mvc, aso.
And simplest web. The Bean annotation is used to indicate that a method instantiates, configures and initializes a new object to be managed by the Spring IoC container. Annotating a class with Configuration indicates that its primary purpose is as a source of bean definitions. Furthermore, Configuration classes allow inter-bean dependencies to be defined by simply calling other Bean methods in the same class.
The simplest possible Configuration class would read as follows:. To instantiate such config, you will need the help of AnnotationConfigApplicationContext class. In the example above, the com. If you are using above configuration in a web application then you will be using AnnotationConfigWebApplicationContext class.
Starting from Spring 2. So instead of using XML to describe a bean wiring, you can move the bean configuration into the component class itself by using annotations on the relevant class, method, or field declaration. Annotation injection is performed before XML injection, thus the latter configuration will override the former for properties wired through both approaches. Annotation wiring is not turned on in the Spring container by default.
So, before we can use annotation-based wiring, we will need to enable it in our Spring configuration file. So consider to have following configuration file in case you want to use any annotation in your Spring application. The life cycle of a Spring bean is easy to understand. When a bean is instantiated, it may be required to perform some initialization to get it into a usable state. Similarly, when the bean is no longer required and is removed from the container, some cleanup may be required.
Spring bean factory is responsible for managing the life cycle of beans created through spring container. The life cycle of beans consist of call back methods which can be categorized broadly in two groups :. Spring framework provides following 4 ways for controlling life cycle events of bean:. For example, customInit and customDestroy methods are example of life cycle method. The beans in spring container can be created in five bean scopes. All the scope names are self-explanatory but lets make them clear so that there will not be any doubt.
Read More : Spring Bean Scopes. In our application, we will be creating only one instance of Person class, and use it inside Customer. Spring framework does not do anything under the hood concerning the multi-threaded behavior of a singleton bean. While practically, most spring beans have no mutable state e.
Service and DAO clases , and as such are trivially thread safe. But if your bean has mutable state e. View Model Objects , so you need to ensure thread safety. In spring framework, setting bean dependencies in configuration files is a good practice to follow, but the spring container is also able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators other beans for your bean by inspecting the contents of the BeanFactory.
Autowiring is specified per bean and can thus be enabled for some beans, while other beans will not be autowired. Apart from the autowiring modes provided in bean configuration file, autowiring can be specified in bean classes also using Autowired annotation. To use Autowired annotation in bean classes, you must first enable the annotation in spring application using below configuration. Same can be achieved using AutowiredAnnotationBeanPostProcessor bean definition in configuration file.
Now, when annotation configuration has been enables, you are free to autowire bean dependencies using Autowired , the way you like. There are five auto wiring modes in spring framework. Lets discuss them one by one.
In a production-scale application, there may be hundreds or thousands of beans declared in the IoC container, and the dependencies between them are often very complicated. In real life application, you will not be interested in checking all the bean properties configured in your context files. Rather you would like to check if particular set of properties have been set or not in some specific beans only.
So solve this problem, you can use Required annotation. To Use the Required annotation over setter method of bean property in class file as below:.
Java Spring Interview Questions
Dependency injection is the concept where you do not create your objects but describe how they should be created, and then expect pre-created objects to be passed in. The Spring container is responsible for the rest. DI can be either constructor based or setter based. Constructor based DI is accomplished when the container invokes a class constructor with a number of arguments, each representing a dependency on other classes. Setter based dependency injection is accomplished when the container calls setter methods on a bean after instantiating it. Numbers are actual for all scopes except prototype, since Spring does not manage the complete lifecycle of a prototype bean: the container instantiates, configures, and otherwise assembles a prototype object and hands it to the client with no further record of that prototype instance. Find top Spring developers today.
Spring is an open source development framework for enterprise Java. The main features of spring may be used for developing applications of Java. Also, extensions for making web applications on top of JavaEE platform can be done. The main goal of spring is to make the development of J2EE development a lot easier to use and promote a programming practice by making use of POJO-based models. Spring is a lightweight framework. This framework is defined as a structure using which we can find the solutions to various technical problems. We hereby provide you with some questions on spring.
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 interview questions
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.
I have tried to collect these spring interview questions which you may face into your next technical interview. For other spring modules, I will share interview questions and answers separately. I will really appreciate if you can suggest more similar spring interview questions which you have faced in your previous interviews and you consider them spring interview questions for experienced to be asked. I will add them in this list.
What is Spring? Answer: Spring is an open source development framework for Enterprise Java. The core features of the Spring Framework can be used in developing any Java application, but there are extensions for building web applications on top of the Java EE platform.
Spring interview questions and answers
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. Programmatic transaction management. No, singleton beans are not thread-safe in Spring framework.
There are a lot of opportunities from many reputed companies in the world. So, You still have an opportunity to move ahead in your career in the Spring certification guide. Do you want to build your career in java spring? Then visit Mindmajix- a global online platform: " Java spring online Training" This course will help you to achieve excellence in this domain. Here are frequently asked java spring interview questions, let's have a look into them. Ans: Spring is an open-source development framework for Enterprise Java. The core features of the Spring Framework can be used in developing any Java application, but there are extensions for building web applications on top of the Java EE platform.
This is a summary of some of the most important questions concerning the Spring Framework, that you may be asked to answer in an interview or in an interview.
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Притормозив, он задумался, в какую сторону повернуть, и в этот момент мотор его веспы кашлянул и заглох. Стрелка топливного индикатора указывала на ноль. И, как бы повинуясь неведомому сигналу, между стенами слева от него мелькнула тень. Нет сомнений, что человеческий мозг все же совершеннее самого быстродействующего компьютера в мире. В какую-то долю секунды сознание Беккера засекло очки в металлической оправе, обратилось к памяти в поисках аналога, нашло его и, подав сигнал тревоги, потребовало принять решение.
- Еще не было случая, чтобы в моих данных появлялись ошибки. Поэтому я хочу узнать мнение специалиста. - Что ж, - сказал Джабба, - мне неприятно первым тебя разочаровать, но твои данные неверны. - Ты так думаешь. - Могу биться об заклад. - Он откусил кусок пирога и заговорил с набитым ртом. - Максимальное время, которое ТРАНСТЕКСТ когда-либо тратил на один файл, составляет три часа.
Не поддается, сэр? - с трудом произнесла. - А как же принцип Бергофского. О принципе Бергофского Сьюзан узнала еще в самом начале своей карьеры.
У него в голове ничего, кроме ТРАНСТЕКСТА. При первых же признаках беды он тут же поднял бы тревогу - а в этих стенах сие означает, что он позвонил бы. - Джабба сунул в рот кусочек сыра моцарелла. - Кроме всего прочего, вирус просто не может проникнуть в ТРАНСТЕКСТ.
Сьюзан казалось, что она сходит с ума. Она уже готова была выскочить из комнаты, когда Стратмор наконец повернул рубильник и вырубил электропитание. В одно мгновение в шифровалке установилась полная тишина. Сирены захлебнулись, мониторы Третьего узла погасли. Тело Грега Хейла растворилось в темноте, и Сьюзан, инстинктивно поджав ноги, прикрылась пиджаком Стратмора.