Zuci Systems Senior Java Developer Interview Questions, Process, and Tips

Q1. Lookup vs graphlookup in mongodb
Ans. 
Lookup is used to perform a left outer join in MongoDB, while graphlookup is used to perform recursive graph traversal.
• Lookup is used to perform a left outer join between two collections in MongoDB.

• Graphlookup is used to perform recursive graph traversal in a collection that contains graph data.

• Lookup can only perform a single level join, while graphlookup can perform multiple levels of traversal.

• Lookup is faster than
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Q2. Count frequency of each character in string
Ans. 
Use a hashmap to count the frequency of each character in a string.
• Create a hashmap to store characters as keys and their frequencies as values.

• Iterate through the string and update the hashmap accordingly.

• Return the hashmap with character frequencies.
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Q1. Create a rest api all the way from controller to repository using NOTEPAD
Ans. 
Creating a REST API from controller to repository using NOTEPAD
• Create a controller class with mapping annotations for REST endpoints

• Implement service layer to handle business logic and interact with repository

• Define repository interface with methods for data access operations

• Use Spring Boot for easy setup and configuration

• Test API endpoints using tools like Postman
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Q2. Couldnt write custom mongodb query at repository layer in notepad which rejected my candidature.
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Paper Test MCQs(Hibernate, Multithreading, Quantative Apptitute, Logical Reasoning,English Grammer check)

Q1. Basic string questions Spring boot questions
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Q1. Project disscussion Questions related to the project Java 8 Stream questions
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Q1. Create a spring boot project and implement crud operation for user table.
Ans. 
Implement CRUD operations for user table in a Spring Boot project.
• Create a Spring Boot project using Spring Initializr

• Define a User entity with necessary fields and annotations

• Create a UserRepository interface extending JpaRepository

• Implement methods in a UserService class for CRUD operations

• Use RESTful endpoints to expose the CRUD operations
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Q1. How the communication is happening between the microservices ?
Ans. 
Communication between microservices is typically done through APIs, messaging queues, or service meshes.
• Microservices communicate with each other through APIs, which allow them to send and receive data over the network.

• Messaging queues like RabbitMQ or Kafka can be used for asynchronous communication between microservices.

• Service meshes like Istio or Linkerd can handle communication between microservices by managing tr...read more
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Q2. Explain SAGA design pattern
Ans. 
SAGA design pattern is used to manage distributed transactions in microservices architecture.
• SAGA breaks down a transaction into a series of smaller, independent transactions.

• Each step in the SAGA pattern is a separate transaction that can be rolled back if needed.

• SAGA ensures eventual consistency by coordinating the transactions across multiple services.

• Example: In an e-commerce application, SAGA can be used to handle...read more
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Q1. Salary Discussion
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Code on Fibonacci series, sum of pairs of number equal to the given number.

Q1. Share a git repo and requirement. Code based on the requirement. Java Spring questions
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Q1. Java microservices & multithreading questions
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Q1. Java fundamentals
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Q2. Spring fundamentals
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Q1. Managerial round
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Q2. Scenario based questions
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