Spring - Interview Questions and Answers for 'Bean' | Search Interview Question

Spring - Interview Questions and Answers for 'Bean' - 29 question(s) found - Order By Rating

Q1. How can we take snapshots and track changes to environment variables in Elastic Beanstalk or Lambda ?

Ans. We can use AWS Config

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Q2. Can we use Prototype Bean scope with Autowiring ?

Spring

Ans. Default Bean scope in auto wiring is Singleton but Yes, that can be changed by specifying the Bean scope explicitly.

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Q3. What is the difference between Singleton and Prototype Bean scope in Spring ?

Spring

Ans. Prototype scope - A new object is created each time it is injected/looked up. It will use new SomeClass() each time.

Singleton scope - It is the default scope. The same object is returned each time it is injected/looked up. Here it will instantiate one instance of SomeClass and then return it each time.

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Q4. What are the disadvantages of Bean Auto Wiring in Spring ?

Spring

Ans. It can always be overridden with explicit wiring. Moreover it's confusing if we use both explicit as well as explicit wiring in the project.

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Q5. What is a session bean ?

Java EE

^{This question was recently asked at 'BirlaSoft'.This question is still unanswered. Can you please provide an answer.}

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Q6. Explain inner beans in Spring.

Spring

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Q7. Difference between ApplicationContext and BeanFactory ?

Spring

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Q8. How can we know how many instances are currently in service within an Elastic Beanstalk environment ?

Amazon Web Services (AWS)

Ans. We can go to respective environment and check configuration and then scaling. It mentions that as current status like

Current status:

2 instance(s) in service, Min: 1, Max: 4

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Q9. What do you understand by "Scaling Trigger" ?

Server

Ans. It's a configuration for auto scaling environment that specify the attributes / conditions for scaling instances up and down. For example - We may like environment to scale up when the number of requests / sec increases a particular threshold and scale down when it decreases below a threshold.

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Q10. What is the difference between single instance Web environment and Load Balanced Auto Scaling ?

Amazon Web Services (AWS)

Ans. Single instance means there is only 1 instance that will bear all the traffic load whereas Load balanced server means that there will be a cluster of servers that will host the application and load will be balanced distributed among them. Auto Scaling means that the number of instances will be expanded / shrunken based on the rule. Rule could be the traffic count , response time etc.

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Q11. What are the types of applications we can create using Elastic Beanstalk ?

Amazon Web Services (AWS)

Ans. Web Server and Worker

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Q12. How do you check logs for your application in AWS ?

Amazon Web Services (AWS)

Ans. We can do it by either going to Elastic Beanstalk -> Respective instance -> Logs

or using CloudWatch -> Logs -> Respective Log Group

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Q13. What is the difference between Elastic Compute Cloud and Elastic Beanstalk ?

Amazon Web Services (AWS)

Ans. EC2 is Amazon computing service whereas Elastic Beanstalk is the AWS service for deploying and managing web applications.

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Q14. What is the use of @Bean annotation in Spring ?

Spring

Ans. There are 2 ways to specify dependencies in Spring, one by the way of specifying beans in config files and other is by specifying annotations like @Bean, @Component , @Service etc to let spring know of the dependencies.

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Q15. Which type of EJB can use bean pooling?

Java EE

Ans. Stateless Session Beans

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Q16. Can we have two beans with same class with different bean id in spring ?

Spring

Ans. Yes

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Q17. Difference between Java beans and Spring Beans ?

Spring

Ans. Java Beans managed by Spring IoC are called Spring Beans.

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Q18. Q: What is default scope of bean in Spring framework?

Spring

Ans. The default scope of bean is Singleton.

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Q19. What bean scopes does Spring support? Explain them.

Spring

Ans. The Spring Framework supports following five scopes -

Singleton
prototype
request
session
global-session

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Very Frequently asked Spring question.

Q20. What is bean auto wiring?

Spring

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 your bean by inspecting the contents of the BeanFactory without using and elements.

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Q21. What is IDE ? List few Java IDE ?

Tool

Ans. IDE stands of Integrated Development Environment. Few Java IDE's are WSAD ( Websphhere Application Developer ) , RAD ( Rational Application Developer ) , Eclipse and Netbeans.

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Q22. What ate the getter and setter methods ?

Ans. getters and setters methods are used to store and manipulate the private variables in java beans. A getters as it has name, suggest retrieves the attribute of the same name. A setters are allows you to set the values of the attributes.

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Q23. Why are Getter and Setter better than directly changing and retrieving fields ?

or

What is the significance of variable hiding in Java ?

or

Why it's preferred to keep variables private and allow their access through getter and setter methods ?

Core Java

Ans. 1. Methods can participate in runtime polymorphism whereas member variables cannot.

For example -

Vehicle vehicle = new Car();

car.getObjVariable();// will return variable defined in Car

whereas

car.variable

will return the variable from Car class irrespective of the object it holds.

2. Validations can be performed before setting the variables.

3. If the input format changes or some other value or calculated value needs to be returned , that can be absorbed by making change ( wrapping ) in the setter and getter. By this the call to method from outside or interface to the object will remain the same.

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Frequently asked in Phone Interviews.

Q24. What the Bean scopes provided by Spring ?

Spring

Ans. Singleton , Prototype , Request , Session , global-session

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Q25. When should we use prototype scope and singleton scope for beans ?

Spring

Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful.

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Q26. How to generate getters and setters automatically in eclipse ?

Eclipse

Ans. Right Click -> Source -> Generate Getters and Setters.

and it will open up a dialog wherein we can select the fields to generate Getters and Setters.

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Q27. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?

Spring

Ans. No, if required we should only have final variables.Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too.

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Q28. Which class provides the enumerated value for Bean Scope ?

a. BeanDefinition
b. ConfigurableBeanFactory
c. WebApplicationContext
d. All of the Above

Spring

Ans. All of the Above

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Q29. What is a Java Bean ? How is it different from other Java classes ?

Ans. A Java bean is a class which abides by following conventions:

Core of the object is member elements and not operations ( methods )

Member Elements can be accessed by getters (and setters if those properties are not read-only).

serializable.

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Q30. Which type of EJB can use bean pooling?

Java EE

a. Session Beans

b. Stateless Session Beans

c. Stateless Sessionless Beans

d. Any EJB Beans

Ans.b. Stateless Session Beans

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