NeoSOFT Interview Questions, Process, and Tips

Q1. What is refelection
Ans. 
Reflection is the ability of a program to examine and modify its own structure and behavior at runtime.
• Allows a program to inspect and modify its own classes, methods, and fields

• Commonly used in frameworks like Spring and Hibernate for configuration and dependency injection

• Can be used to access private fields or methods using Java reflection API
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Basic logical questions

Q1. Write simple SQL queries
Ans. 
Basic SQL queries for software engineer interview
• SELECT * FROM table_name;

• SELECT column1, column2 FROM table_name WHERE condition;

• INSERT INTO table_name (column1, column2) VALUES (value1, value2);

• UPDATE table_name SET column1 = value1 WHERE condition;

• DELETE FROM table_name WHERE condition;
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Q1. Salary Discussion
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Q1. What is MediaType, app.run, app.use
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Q1. 1. How microservices communicate with each other?
Ans. 
Microservices communicate with each other through APIs and messaging protocols.
• Microservices use APIs to communicate with each other.

• Messaging protocols like HTTP, AMQP, and MQTT are used for asynchronous communication.

• Service discovery mechanisms like Eureka and Consul are used to locate services.

• API gateways like Zuul and Kong are used to manage API traffic.

• Event-driven architecture is used for real-time communicatio
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Q2. 2. How do you secure your APIs?
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Securing APIs involves implementing authentication, authorization, encryption, and input validation.
• Implement authentication mechanisms like OAuth, JWT, or API keys

• Use authorization to control access to APIs based on user roles and permissions

• Encrypt sensitive data transmitted over the network using HTTPS

• Validate and sanitize input to prevent common security vulnerabilities like SQL injection or cross-site scripting (X
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Q3. 3. Scenario based question on qualifier?
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Q4. 4. What is ORM tool?
Ans. 
ORM (Object-Relational Mapping) tool is a software framework that maps objects to relational databases.
• ORM tool simplifies database operations by allowing developers to interact with databases using object-oriented programming.

• It eliminates the need for writing complex SQL queries by providing a higher-level abstraction.

• ORM tools handle tasks like data persistence, retrieval, and mapping between objects and database ta...read more
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Q5. 5. Advantages of hibernate
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Hibernate simplifies database programming in Java applications.
• Hibernate provides a simple and efficient way to interact with databases.

• It eliminates the need for writing complex SQL queries.

• It supports object-oriented programming and mapping of Java classes to database tables.

• It provides caching and lazy loading mechanisms for improved performance.

• It supports transaction management and reduces the risk of data corrupt...read more
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Q6. 6. Rest controller vs Controller
Ans. 
Rest controller is used for RESTful web services while Controller is used for traditional web applications.
• Rest controller maps HTTP requests to RESTful web services while Controller maps HTTP requests to traditional web applications.

• Rest controller uses @RestController annotation while Controller uses @Controller annotation.

• Rest controller returns data in JSON or XML format while Controller returns data in HTML format...read more
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Q7. 7. What if i write component in place of service ?
Ans. 
Using component instead of service may cause confusion and errors in the code.
• Components and services are two different concepts in Java development.

• Components are used for UI elements while services are used for business logic.

• Using component instead of service may lead to errors in the code and confusion for other developers.

• For example, if a component is used instead of a service for business logic, it may not have ...read more
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Q8. 8. What is the work of @autowired?
Ans. 
The @Autowired annotation is used to automatically wire beans by matching the data type of the bean with the data type of the property.
• Used to inject dependencies automatically

• Reduces the need for manual bean configuration

• Can be used with constructors, fields, and methods

• Can be used with @Qualifier to specify which bean to wire
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Q9. 9. What is Eureka server ? Default port
Ans. 
Eureka server is a service registry that enables microservices to discover and communicate with each other.
• Eureka server is a component of Netflix's OSS suite.

• It allows services to register themselves and discover other services.

• It uses a REST API for communication.

• Default port is 8761.
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Q10. 10. What is circuit breaker? Hystrix
Ans. 
Circuit breaker is a design pattern used to prevent cascading failures in distributed systems. Hystrix is a popular implementation.
• Circuit breaker monitors the availability of a service and trips if the service fails repeatedly.

• It helps to prevent cascading failures by failing fast and providing fallback options.

• Hystrix is a popular implementation of circuit breaker pattern in Java.

• It provides features like request cac
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Q11. 11. What are ternary operators ?
Ans. 
Ternary operators are conditional operators that evaluate a boolean expression and return one of two values based on the result.
• Ternary operators are written in the form of 'condition ? value1 : value2'

• If the condition is true, the operator returns value1, otherwise it returns value2

• Ternary operators can be used as a shorthand for if-else statements

• Example: int x = (a > b) ? a : b; // assigns the larger value of a and
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Q12. 12. How to write the entity class?
Ans. 
Entity class represents a table in a database and its attributes as fields.
• Define class with @Entity annotation

• Add @Id annotation to primary key field

• Add @Column annotation to map fields to table columns

• Implement getters and setters

• Override equals() and hashCode() methods
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Q13. 13. What is crud vs Jpa ?
Ans. 
CRUD is a basic operation for data manipulation while JPA is a Java specification for ORM.
• CRUD stands for Create, Read, Update, and Delete which are basic operations for data manipulation.

• JPA is a Java specification for Object-Relational Mapping (ORM) which provides a way to map Java objects to relational database tables.

• JPA provides a higher level of abstraction and simplifies the data access layer by providing an API...read more
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Q1. What are constraints
Ans. 
Constraints are rules that are applied to the data in a database to ensure its integrity and consistency.
• Constraints define the limits or conditions that must be met for data to be valid.

• They can be applied to individual columns or entire tables.

• Common types of constraints include primary key, foreign key, unique, and check constraints.

• Primary key constraints ensure that each row in a table is uniquely identified.

• Forei...read more
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Q1. When we are use interface and abstract class in Android
Ans. 
Interfaces and abstract classes are used in Android to achieve abstraction, modularity, and code reusability.
• Interfaces are used to define a contract that classes must implement, allowing for polymorphism and loose coupling.

• Abstract classes provide a base implementation for subclasses, allowing for code reuse and providing common functionality.

• Interfaces are commonly used for event handling, callbacks, and defining con...read more
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