10+ Meesho Interview Questions and Answers

To implement REST API, follow these steps:

• Define the resources and their URIs

• Define the HTTP methods (GET, POST, PUT, DELETE)

• Implement the methods using a programming language

• Test the API using tools like Postman

• Document the API using tools like Swagger

n+1 issue in Hibernate refers to the problem of excessive database queries being executed due to lazy loading.

• Occurs when a query fetches an entity and its associated entities one at a time instead of all at once

• Can be solved by using eager loading or batch fetching

• Can also be solved by using a join fetch query

• Can lead to performance issues and slow down the application

Example code using @OneToMany and @ManyToOne annotations

• Create two entities, one with @OneToMany and the other with @ManyToOne annotation

• Use mappedBy attribute in @OneToMany to specify the relationship

• Use joinColumn attribute in @ManyToOne to specify the foreign key column

• Example: User has many Posts, Post belongs to one User

Using stream, find the second largest number.

• Sort the stream in descending order and return the second element.

• Use the reduce() method to compare and find the second largest number.

• Create a priority queue and add elements to it. Pop the second largest element from the queue.

Hibernate supports two types of caches: Level 1 (session) cache and Level 2 (SessionFactory) cache.

• Level 1 cache is associated with the session object and is enabled by default.

• Level 2 cache is shared across sessions and requires configuration.

• Level 2 cache can be implemented using various providers like Ehcache, Infinispan, Hazelcast, etc.

Java programs output can be determined by running the code and observing the console or log files.

• Compile the Java code using a compiler like javac

• Run the compiled code using the Java Virtual Machine (JVM)

• Observe the output in the console or log files

• Output can be text, numbers, or other data types

Java 8 introduced several new features including lambda expressions, streams, and functional interfaces.

• Lambda expressions allow for functional programming and simplify code

• Streams provide a way to process collections of data in a functional way

• Functional interfaces allow for the use of lambda expressions

• Default methods allow for adding methods to interfaces without breaking existing implementations

• Date and time API improvements

• Nashorn JavaScript engine integration

Spring Boot provides transaction management support through the use of @Transactional annotation.

• Spring Boot uses the @Transactional annotation to manage transactions.

• The @Transactional annotation can be applied to methods or classes.

• Spring Boot supports both programmatic and declarative transaction management.

• Programmatic transaction management involves using the TransactionTemplate class.

• Declarative transaction management involves using the @Transactional annotation.

• Spring ...read more

Streams are a sequence of data elements that can be processed in parallel or sequentially. They are used in various applications.

• Streams are used for data processing, such as filtering, mapping, and reducing.

• They are also used for I/O operations, such as reading and writing files or network sockets.

• Streams can be parallelized to improve performance on multi-core systems.

• Examples of stream-based APIs include Java 8 Streams, Node.js Streams, and Apache Kafka Streams.

Spring Boot is a framework for building standalone, production-grade Spring-based applications.

• Provides a simplified way to create Spring applications with minimal configuration

• Includes an embedded Tomcat, Jetty or Undertow server for easy deployment

• Supports auto-configuration, which automatically configures Spring based on dependencies

• Offers a wide range of starter dependencies for common use cases

• Enables easy integration with other Spring projects like Spring Data, Spring S...read more

Final assurance of achieving target is through continuous monitoring, adjusting strategies, and team collaboration.

• Regularly track progress towards the target

• Analyze data to identify areas of improvement

• Adjust strategies based on feedback and results

• Collaborate with team members to ensure everyone is aligned and working towards the same goal

UAT testing is the process of testing a software application by the end-users to ensure its usability, functionality, and compatibility.

• UAT stands for User Acceptance Testing

• It is the final phase of testing before the software is released to the market

• It is performed by the end-users to ensure that the software meets their requirements

• It focuses on the usability, functionality, and compatibility of the software

• It helps to identify any issues or bugs that were not caught durin...read more

Reassuring the interviewer about the reliability of the results

• Highlight the thoroughness of the process followed to obtain the results

• Mention any quality control measures implemented to ensure accuracy

• Provide examples of successful outcomes or positive feedback received

• Discuss any certifications or accreditations that validate the results