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10+ Planet Spark Interview Questions and Answers

Updated 5 Feb 2024
Popular Designations
Q1. What is the difference between constructor injection and setter injection in dependency injection?
Ans.

Constructor injection passes dependencies through a class constructor, while setter injection uses setter methods.

  • Constructor injection is done by passing dependencies as parameters to the constructor.

  • Setter injection involves calling setter methods to set the dependencies after the object is created.

  • Constructor injection ensures that all required dependencies are provided at the time of object creation.

  • Setter injection allows for optional dependencies to be set after the obj...read more

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Q2. What are the different states of entity instances?
Ans.

Entity instances can be in new, managed, detached, or removed states.

  • New state: when an entity is first created but not yet associated with a persistence context.

  • Managed state: when an entity is being managed by a persistence context and any changes made to it will be tracked.

  • Detached state: when an entity was previously managed but is no longer associated with a persistence context.

  • Removed state: when an entity is marked for removal from the database.

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Q3. What are the advantages of design patterns in Java?
Ans.

Design patterns in Java provide reusable solutions to common problems, improving code quality and maintainability.

  • Promotes code reusability by providing proven solutions to common design problems

  • Improves code maintainability by following established best practices

  • Enhances code readability by providing a common language for developers to communicate design ideas

  • Helps in creating scalable and flexible software architecture

  • Examples include Singleton, Factory, Observer, and Strat...read more

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Q4. What are the different types of advice in Spring AOP?
Ans.

Types of advice in Spring AOP include before, after, around, after-returning, and after-throwing.

  • Before advice: Executed before the method invocation.

  • After advice: Executed after the method invocation, regardless of its outcome.

  • Around advice: Wraps around the method invocation, allowing for custom behavior before and after.

  • After-returning advice: Executed after the method successfully returns a value.

  • After-throwing advice: Executed after the method throws an exception.

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Q5. What are the benefits of the Java Executor Framework?
Ans.

The Java Executor Framework provides a way to manage and control the execution of tasks in a multithreaded environment.

  • Allows for easy management of thread pools, reducing overhead of creating new threads for each task.

  • Provides a way to schedule tasks for execution at a specific time or with a delay.

  • Supports task cancellation and interruption.

  • Facilitates handling of task dependencies and coordination between tasks.

  • Offers better control over thread execution, such as setting t...read more

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Q6. Can you explain the prototype scope in Spring?
Ans.

Prototype scope in Spring creates a new instance of the bean every time it is requested.

  • Prototype scope is used when a new instance of the bean is required for each request.

  • It is not thread-safe, as a new instance is created for each request.

  • Example: If a bean is defined with prototype scope, a new instance will be created every time it is injected or requested.

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Q7. How do you implement the Java Executor Framework?
Ans.

The Java Executor Framework provides a way to manage and execute tasks asynchronously in Java applications.

  • Create an instance of ExecutorService using Executors class

  • Submit tasks for execution using execute() or submit() methods

  • Handle the results of the tasks using Future objects

  • Shutdown the ExecutorService when tasks are completed using shutdown() method

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Q8. What is Inversion of Control?
Ans.

Inversion of Control is a design principle where the control flow of a program is inverted, with the framework controlling the flow.

  • Inversion of Control allows for decoupling of components, making the code more modular and easier to maintain.

  • Common examples of Inversion of Control include dependency injection and event listeners.

  • Frameworks like Spring and Hibernate make use of Inversion of Control to manage object lifecycles and dependencies.

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Q9. What is the Java Executor Framework?
Ans.

Java Executor Framework is a framework provided by Java for managing and executing tasks asynchronously.

  • It provides a way to manage threads and execute tasks concurrently.

  • It includes interfaces like Executor, ExecutorService, and ScheduledExecutorService.

  • It allows for better control over thread management and task execution compared to manually managing threads.

  • Example: Executors.newFixedThreadPool(5) creates a thread pool with 5 threads for executing tasks.

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Q10. What is dependency injection?
Ans.

Dependency injection is a design pattern in which the dependencies of an object are provided externally rather than created within the object itself.

  • In dependency injection, the dependencies of an object are injected into it from an external source, typically a framework or container.

  • This helps in achieving loose coupling between classes, making the code more modular and easier to maintain.

  • There are three common types of dependency injection: constructor injection, setter inj...read more

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