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

Spring - Interview Questions and Answers for 'Spring bean' - 7 question(s) found - Order By Rating

Q1. What is the difference between Singleton and Prototype Bean scope in 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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Q2. 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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Q3. Explain inner beans in Spring.

Spring

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Q4. 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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Q5. Can we have two beans with same class with different bean id in spring ?

Spring

Ans. Yes

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Q6. 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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Q7. 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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