IRIS Business Services Interview Questions and Answers

Oops concept in Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation hides the internal state of an object and restricts access to it.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction focuses on the essential characteristics of an object while hiding unnecessary details.

DB connections flow in Spring Boot involves configuring data source, creating connection pool, and managing transactions.

• Configure data source in application.properties or application.yml

• Use @EnableJpaRepositories to enable JPA repositories

• Create connection pool using HikariCP or Tomcat JDBC

• Manage transactions using @Transactional annotation

Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.

• HTTP: RESTful APIs are commonly used for communication between microservices.

• Messaging queues: Services can communicate asynchronously through message brokers like RabbitMQ or Kafka.

• RPC (Remote Procedure Call): Services can directly call each other's functions over the network.

The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.

• Static variables are shared among all instances of a class

• Static methods can be called without creating an instance of the class

• Static blocks are used to initialize static variables

REST is lightweight, uses standard HTTP methods, and is more flexible. SOAP is more rigid, uses XML, and has built-in security features.

• REST uses standard HTTP methods like GET, POST, PUT, DELETE for communication.

• SOAP uses XML for communication and has built-in security features like WS-Security.

• REST is more lightweight and flexible, making it easier to work with in modern web development.

• SOAP is more rigid and has a steep learning curve, but is still widely used in enterpri...read more

The main difference between .Net and .Net Core is that .Net Core is a cross-platform, open-source framework while .Net is Windows-only.

• Net Core is cross-platform, supporting Windows, macOS, and Linux

• .Net Core is open-source, allowing for community contributions and faster updates

• .Net Core is modular, allowing developers to include only the necessary components for their application

• .Net Core has better performance and scalability compared to .Net Framework

• .Net Core is recommen...read more

Project creep refers to the gradual expansion of a project's scope, timeline, and budget beyond the initial plan.

• Project creep occurs when additional features or requirements are added to a project without proper evaluation of the impact on resources.

• It can lead to delays in project completion, increased costs, and decreased quality of deliverables.

• Effective project management techniques such as regular monitoring and communication can help prevent project creep.

• Example: A so...read more

Waterfall is a linear approach to project management, while Agile is iterative and flexible.

• Waterfall follows a sequential process, while Agile allows for incremental development.

• Waterfall requires detailed planning upfront, while Agile adapts to changes throughout the project.

• Waterfall is best suited for projects with clear requirements, while Agile is ideal for projects with evolving requirements.

• Waterfall may lead to delays if changes are needed late in the project, while ...read more