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Kumori Technologies Backend Java Developer Interview Questions and Answers
Kumori Technologies Backend Java Developer Interview Experiences
1 interview found
Anonymous
I applied via Walk-in and was interviewed in Dec 2022. There were 2 interview rounds.
(2 Questions)
- Q1. Inheritance, rest api ,asynchronous and synchronous programming, one dsa basic question
- Q2. Ajax, Javascript, fetch api, and other frontend related questions
Interview Preparation Tips
Check everything you know whatever you have written in your resume
Top trending discussions
Interview questions from similar companies
I was interviewed in Jul 2024.
(5 Questions)
- Q1. What is idempotent term in patch and put?
- Ans.
Idempotent term in patch and put means that multiple identical requests have the same effect as a single request.
Idempotent means that the result of a successful request is the same regardless of how many times it is repeated.
In PATCH and PUT requests, idempotent means that sending the same request multiple times will not have any additional side effects.
For example, if a PATCH request updates a resource with specific ...
- Q2. Java memory types and which object stores where?
- Ans.
Java memory types and where objects are stored
Java memory consists of stack and heap
Primitive data types are stored in stack
Objects and arrays are stored in heap
References to objects are stored in stack
Example: int num = 5; // num is stored in stack, value 5 is stored in stack
Example: String str = new String(); // str reference is stored in stack, actual String object is stored in heap
- Q3. Hash map store unique name?
- Ans.
Yes, hash map stores unique keys.
Hash map in Java does not allow duplicate keys. If you try to insert a duplicate key, it will replace the existing value with the new one.
However, hash map allows duplicate values.
Example: HashMap
- Q4. Hashmap java 7 and java 8 difference?
- Ans.
Java 8 introduced new methods for HashMap such as forEach, compute, merge, etc.
Java 8 introduced new methods like forEach, compute, merge for HashMap operations
Java 8 allows using lambda expressions for iterating over HashMap entries
Java 8 introduced default methods in Map interface for HashMap
- Q5. Can we create static method or variable inside static main()
- Ans.
No, static methods or variables cannot be created inside static main() method.
Static methods or variables cannot be created inside another static method.
Static methods or variables can only be created at the class level, outside of any method.
Example: public class MyClass { static int myVariable = 10; }
Interview Preparation Tips
They have their own answer, they don't accept your answer even though if it is correct.
5 years experienced person they ask just java basic, not springboot, no Microservices, no any advanced questions.
Skills evaluated in this interview
ashwini kasar
(2 Questions)
- Q1. What is profile in springboot
- Ans.
Profile in Spring Boot is a set of configurations that can be used to customize the behavior of an application.
Profiles allow developers to define different configurations for different environments (e.g. development, testing, production).
Profiles can be activated using the 'spring.profiles.active' property in the application.properties file.
Profiles can be used to specify different database connections, logging levels...
- Q2. How will you create custom exception
- Ans.
Custom exceptions can be created by extending the Exception class in Java.
Create a new class that extends the Exception class
Override the constructors to provide custom messages and error codes
Throw the custom exception using the 'throw' keyword
Skills evaluated in this interview
Suraj Verma
(2 Questions)
- Q1. What is StreamsAPI
- Ans.
StreamsAPI is a feature in Java that allows for processing sequences of elements in a functional style.
StreamsAPI provides a way to work with collections of objects in a more concise and declarative manner.
It supports operations like filter, map, reduce, and collect.
Example: List
names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(System.out::println);
- Q2. What is exception in Java
- Ans.
An exception in Java is an event that disrupts the normal flow of a program's instructions.
Exceptions are objects that are thrown when an abnormal condition occurs during the execution of a program.
They can be caught and handled using try-catch blocks.
Unchecked exceptions do not need to be declared in a method's throws clause, while checked exceptions do.
Examples of exceptions in Java include NullPointerException, Arra
Skills evaluated in this interview
Selected
I applied via Approached by Company and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. What improvements to interfaces were introduced in Java 8 that were missing in Java 7, specifically regarding static and default methods?
- Ans.
Java 8 introduced static and default methods in interfaces, allowing for method implementation and code reusability.
Java 8 introduced static methods in interfaces, allowing for method implementation directly in the interface itself.
Default methods were also introduced in Java 8, enabling interfaces to have method implementations without affecting implementing classes.
Static methods in interfaces can be called using the...
- Q2. Explain internal working of HashMap ? How to synchronize it ?
- Ans.
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
HashMap uses an array of linked lists to store key-value pairs.
When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.
If multiple keys hash to the same index, a linked list is used to handle collisions.
To synchronize a HashMap, you can use the synchronizedMap() m...
- Q3. Given a list of employees with their ratings, how can you sort the employees based on their ratings using the Java 8 Streaming API?
- Q4. Will the program compile if the parent class throws a runtime exception while the child class throws an arithmetic exception?
- Ans.
No, the program will not compile if the parent class throws a runtime exception while the child class throws an arithmetic exception.
In Java, if a parent class method throws a checked exception, the child class method can only throw the same exception or its subclasses.
ArithmeticException is an unchecked exception, so if the parent class throws a checked exception and the child class throws an unchecked exception, the ...
- Q5. In a Spring Boot application with two databases, how can you configure JDBC to specify which database to use?
- Ans.
Configure JDBC in Spring Boot to specify which database to use
Define multiple DataSource beans in the configuration class
Use @Primary annotation to specify the primary DataSource
Use @Qualifier annotation to specify the secondary DataSource
Inject the DataSource beans where needed in the application
- Q6. How to use a jetty server in your spring boot application ?
- Ans.
To use a Jetty server in a Spring Boot application, you can configure it as a dependency and customize its settings.
Add Jetty server dependency in your pom.xml file
Exclude Tomcat server dependency if it's included by default in Spring Boot
Configure Jetty server settings in application.properties or application.yml file
Example: Add Jetty dependency - <dependency> <groupId>org.springframework.boot</groupId...
- Q7. Difference between @RequestParam and @PathVariable ?
- Ans.
RequestParam is used to extract query parameters from the URL, while PathVariable is used to extract values from the URI path.
RequestParam is used for query parameters in the URL, while PathVariable is used for values in the URI path.
RequestParam is optional, while PathVariable is required.
RequestParam is used with the @RequestParam annotation, while PathVariable is used with the @PathVariable annotation.
Example: @Requ...
- Q8. How would you handle a scenario where one microservice is awaiting a response from another microservice that is taking an extended time to respond?
- Ans.
I would implement timeout mechanisms and retries to handle the scenario of one microservice awaiting a response from another microservice taking an extended time.
Implement timeout mechanisms in the calling microservice to limit the waiting time for a response.
Set up retry logic to automatically resend the request to the slow microservice if no response is received within the specified timeout period.
Use circuit breaker...
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(8 Questions)
- Q1. How much exp in docker?
- Ans.
I have 2 years of experience working with Docker in various projects.
2 years of experience working with Docker in various projects
Proficient in creating Docker containers, managing images, and orchestrating containers using Docker Compose
Familiar with Docker Swarm and Kubernetes for container orchestration
Experience in troubleshooting Docker-related issues and optimizing container performance
- Q2. Do you have exp in Kubernetes?
- Ans.
Yes, I have experience in Kubernetes.
I have worked on deploying and managing applications on Kubernetes clusters.
I am familiar with creating and managing Kubernetes resources such as pods, deployments, services, and ingresses.
I have experience in using tools like kubectl and Helm for interacting with Kubernetes clusters.
I have implemented CI/CD pipelines using Kubernetes for automated deployment and scaling of applicat
- Q3. What is OOP?
- Ans.
OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
OOP focuses on creating objects that contain data and methods to manipulate that data.
Encapsulation, inheritance, and polymorphism are key principles of OOP.
Examples of OOP languages include Java, C++, and Python.
- Q4. Types of polymorphism
- Ans.
Polymorphism in Java refers to the ability of a method to do different things based on the object it is acting upon.
Types of polymorphism in Java include method overloading and method overriding.
Method overloading is when multiple methods have the same name but different parameters.
Method overriding is when a subclass provides a specific implementation of a method that is already defined in its superclass.
- Q5. Thread in java
- Ans.
Threads in Java allow multiple tasks to run concurrently within a single program.
Threads are lightweight sub-processes that share the same memory space.
They are used to improve performance by allowing tasks to run simultaneously.
Examples include creating a new thread using the Thread class or implementing the Runnable interface.
- Q6. Knowledge in which spring modules
- Q7. What is spring profile
- Ans.
Spring profile is a way to segregate parts of your application configuration and make it only available in certain environments.
Spring profiles allow you to define different configurations for different environments such as development, testing, and production.
You can use @Profile annotation to specify which beans should be loaded based on the active profile.
Profiles can be activated in various ways such as through app...
- Q8. What is @PreAuthorize and @PostAuthorize
- Ans.
Annotations used in Spring Security to apply authorization rules before and after a method is called.
Used in Spring Security to define authorization rules
@PreAuthorize is used to apply authorization rules before a method is called
@PostAuthorize is used to apply authorization rules after a method is called
Both annotations support SpEL expressions for defining rules
Interview Preparation Tips
- Basics in java
- Spring security
- Spring Boot
- Docker
- Cloud Computing
Selected
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(6 Questions)
- Q1. Java 8 , java 11 and java 17 features?
- Ans.
Java 8 introduced lambda expressions, Java 11 added local-variable syntax for lambda parameters, and Java 17 included sealed classes and pattern matching.
Java 8 introduced lambda expressions for functional programming.
Java 11 added local-variable syntax for lambda parameters to simplify code.
Java 17 included sealed classes to restrict inheritance and pattern matching for instanceof checks and type casts.
- Q2. Dispatcher servlet, design patterns
- Q3. @SpringbootApplication annotation, actuators
- Q4. String Coding question with java 8 features such as lambda function and stream api
- Q5. Number of words in a string
- Ans.
Count the number of words in a given string.
Split the string by spaces and count the number of resulting elements.
Handle edge cases like multiple spaces or empty strings.
Consider punctuation marks as part of words unless specified otherwise.
- Q6. Microservice design patterns
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(2 Questions)
- Q1. What are virtual threads and its uses
- Q2. Differenciate deep cloning vs shallow cloning with a code
I applied via Job Fair and was interviewed in Oct 2024. There were 4 interview rounds.
Onlin test consist pf easy numerical questions
Easy questions not so difficult
(3 Questions)
- Q1. Java oops concept
- Q2. Basic sprophramming questions
- Q3. Networking firewall cisco
(2 Questions)
- Q1. Personal questions
- Q2. Whetehr to willing to work in any locations
- Ans.
Yes, I am willing to work in any location for the right opportunity.
I am open to relocating for the right job opportunity
I am flexible and adaptable to new environments
I believe working in different locations can provide valuable experiences and growth opportunities
Interview Preparation Tips
- Networking
I applied via Company Website and was interviewed in Oct 2024. There were 3 interview rounds.
First round is quit easy
2 coding question based on dsa
(2 Questions)
- Q1. Explain different phases of sdlc
- Ans.
SDLC stands for Software Development Life Cycle, which consists of different phases from planning to maintenance.
1. Planning phase involves defining project scope, requirements, and creating a project plan.
2. Analysis phase focuses on gathering and analyzing requirements to create a detailed system design.
3. Design phase involves creating a high-level design, detailed design, and architecture for the software.
4. Implem...
- Q2. 4 paillers of datastructure.
- Ans.
The 4 pillars of data structure are arrays, linked lists, stacks, and queues.
Arrays: Data structure that stores a collection of elements with a fixed size.
Linked Lists: Data structure where each element points to the next element in the sequence.
Stacks: Data structure that follows the Last In First Out (LIFO) principle.
Queues: Data structure that follows the First In First Out (FIFO) principle.
Skills evaluated in this interview
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