Spring Interview Questions And Answers In Java Pdf
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- Spring Interview Questions
- Spring Interview Questions and Answers
- Spring interview questions and answers
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 framework targets to make Java EE development easier to use and promote good programming practice by enabling a POJO-based programming model.
Spring Interview Questions
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. Spring framework targets to make Java EE development easier to use and promote good programming practice by enabling a POJO-based programming model.
Ans: This is the basic Spring module, which provides the fundamental functionality of the Spring framework. BeanFactory is the heart of any spring-based application. Spring framework was built on the top of this module, which makes the Spring container. Ans: The most useful one is org. This container reads the configuration metadata from an XML file and uses it to create a fully configured system or application.
This module also introduces metadata programming to Spring. Ans: With the JDBC abstraction and DAO module, we can be sure that we keep up the database code clean and simple, and prevent problems that result from a failure to close database resources. It provides a layer of meaningful exceptions on top of the error messages given by several database servers. Ans: The Spring web module is built on the application context module, providing a context that is appropriate for web-based applications.
This module also contains support for several web-oriented tasks such as transparently handling multipart requests for file uploads and programmatic binding of request parameters to your business objects. It also contains integration support with Jakarta Struts. Ans: MVC framework is provided by Spring for building web applications. With Spring MVC you can declaratively bind request parameters to your business objects.
Ans: Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other. Ans: The Spring IoC is responsible for creating the objects, managing them with dependency injection DI , wiring them together, configuring them, as also managing their complete lifecycle. Ans: IOC or dependency injection minimizes the amount of code in an application. It makes it easy to test applications since no singletons or JNDI lookup mechanisms are required in unit tests.
Loose coupling is promoted with minimal effort and least intrusive mechanism. IOC containers support eager instantiation and lazy loading of services. The full path of the XML bean configuration file must be provided to the constructor. Ans: Application contexts provide a means for resolving text messages, a generic way to load file resources such as images , they can publish events to beans that are registered as listeners.
In addition, operations on the container or beans in the container, which have to be handled in a programmatic fashion with a bean factory, can be handled declaratively in an application context. The application context implements MessageSource, an interface used to obtain localized messages, with the actual implementation being pluggable. Ans: Dependency Injection, an aspect of Inversion of Control IoC , is a general concept, and it can be expressed in many different ways.
This concept says that you do not create your objects but describe how they should be created. A container the IOC container is then responsible for hooking it all up. The best solution is using constructor arguments for mandatory dependencies and setters for optional dependencies.
They are instantiated, assembled, and managed by the Spring IoC container. These beans are created with the configuration metadata that is supplied to the container, for example, in the form of XML definitions. Beans defined in spring framework are singleton beans.
By default, it is set to true. So, all the beans in spring framework are by default singleton beans. Ans: A Spring Bean definition contains all configuration metadata which is needed for the container to know how to create a bean, its lifecycle details and its dependencies. Ans: There are three important methods to provide configuration metadata to the Spring Container:.
Ans: When defining an in Spring, we can also declare a scope for the bean. It can be defined through the scope attribute in the bean definition. On the other hand, when the same instance of a bean must be returned by Spring every time it is needed, the bean scope attribute must be set to a singleton.
Ans: There are five scoped provided by the Spring Framework supports following five scopes:. Ans: There are two important bean lifecycle methods. The first one is set up which is called when the bean is loaded into the container. The second method is the teardown method which is called when the bean is unloaded from the container.
The bean tag has two important attributes init-method and destroy-method with which you can define your own custom initialization and destroy methods.
There are also the corresponding annotations PostConstruct and PreDestroy. Ans: When a bean is only used as a property of another bean it can be declared as an inner bean. Inner beans are always anonymous and they are always scoped as prototypes. Ans: Spring offers the following types of collection configuration elements:.
Ans: Wiring, or else bean wiring is the case when beans are combined together within the Spring container. When wiring beans, the Spring container needs to know what beans are needed and how the container should use dependency injection to tie them together.
Ans: The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators other beans for a bean by inspecting the contents of the BeanFactorywithout using and elements.
Ans: The autowiring functionality has five modes which can be used to instruct Spring container to use autowiring for dependency injection:. Ans: Java-based configuration option enables you to write most of your Spring configuration without XML but with the help of few Java-based annotations. An example is a Configuration annotation, that indicates that the class can be used by the Spring IoC container as a source of bean definitions.
Another example is the Bean annotated method that will return an object that should be registered as a bean in the Spring application context. Ans: An alternative to XML setups is provided by an annotation-based configuration which relies on the bytecode metadata for wiring up components instead of angle-bracket declarations. Instead of using XML to describe a bean wiring, the developer moves the configuration into the component class itself by using annotations on the relevant class, method, or field declaration.
Ans: Annotation wiring is not turned on in the Spring container by default. In order to use annotation-based wiring, we must enable it in our Spring configuration file by configuring element.
Ans: This annotation simply indicates that the affected bean property must be populated at configuration time, through an explicit property value in a bean definition or through autowiring. The container throws BeanInitializationException if the affected bean property has not been populated. Ans: The Autowired annotation provides more fine-grained control over where and how autowiring should be accomplished.
Ans: When there are more than one beans of the same type and only one is needed to be wired with a property, the Qualifier annotation is used along with Autowired annotation to remove the confusion by specifying which exact bean will be wired. So developers only need to write the statements and queries to get the data to and from the database. JDBC can be used more efficiently with the help of a template class provided by Spring framework, which is the JdbcTemplate.
Ans: JdbcTemplate class provides many convenience methods for doing things such as converting database data into primitives or objects, executing prepared and callable statements, and providing custom database error handling. This allows us to switch between the persistence technologies fairly easily and to code without worrying about catching exceptions that are specific to each technology. The integration process is of 3 steps:. Ans: Most users of the Spring Framework choose declarative transaction management because it is the option with the least impact on application code, and hence is most consistent with the ideals of a non-invasive lightweight container.
Declarative transaction management is preferable over programmatic transaction management though it is less flexible than programmatic transaction management, which allows you to control transactions through your code. Ans: Aspect-oriented programming, or AOP, is a programming technique that allows programmers to modularize crosscutting concerns or behavior that cuts across the typical divisions of responsibility, such as logging and transaction management. Ans: The core construct of AOP is the aspect, which encapsulates behaviors affecting multiple classes into reusable modules.
It ia a module which has a set of APIs providing cross-cutting requirements. For example, a logging module would be called AOP aspect for logging. An application can have any number of aspects depending on the requirement. Ans: The Concern is behaviour we want to have in a module of an application. A Concern may be defined as a functionality we want to implement. The cross-cutting concern is a concern which is applicable throughout the application and it affects the entire application. For example, logging, security and data transfer are the concerns which are needed in almost every module of an application, hence they are cross-cutting concerns.
Ans: The joinpoint represents a point in an application where we can plug-in an AOP aspect. It is the actual place in the application where an action will be taken using Spring AOP framework.
Ans: The advice is the actual action that will be taken either before or after the method execution. This is an actual piece of code that is invoked during the program execution by the Spring AOP framework. Spring aspects can work with five kinds of advice:. Ans: The pointcut is a set of one or more joinpoints where advice should be executed.
You can specify pointcuts using expressions or patterns. Ans: An Introduction allows us to add new methods or attributes to existing classes. Ans: A target object is an object being advised by one or more aspects. It will always be a proxy object. It is also referred to as the advised object. Ans: A proxy is an object that is created by applying advice to a target object.
Spring Interview Questions and 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?
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.
How does Spring resolves view returned by ModelAndView class? Some Spring MVC questions are tricky e. Struts and Spring integration and can be only answered by experienced Java program with 2 to 4 year experience in Spring MVC framework. Good questions Radhe. How do you fix this issue?
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.
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. Recommended Read : Spring Framework.
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