Visa Servicenow Developer Interview Questions and Answers

Q1. Basics of java like string ,string builder ,Buffer,scp
Add your answer
Q2. Spring boot annotaions
Add your answer

Q1. Collection related questions asked
Add your answer
Q2. Performance tuning questions asked
Add your answer

Q1. Sal queries simeple data structure question finding largest number in am array.
Add your answer
Q2. Solid principal
Add your answer

Q1. Lazy loading and eager loading in Java in context of Singleton class
Ans. 
Lazy loading defers the initialization of an object until it is actually needed, while eager loading initializes the object immediately.
• Lazy loading is commonly used in Singleton pattern to delay the creation of the instance until it is requested.

• Eager loading initializes the Singleton instance at the time of class loading.

• Lazy loading can help improve performance by only creating the instance when needed, while eager ...read more
Answered by AI
Add your answer
Q2. Connect master and slave instances of a DB in spring boot project
Ans. 
Use Spring Boot configuration to connect master and slave instances of a DB
• Configure multiple data sources in application.properties or application.yml file

• Use @Primary annotation for the master data source and @Qualifier annotation for the slave data source

• Define separate DataSource, JdbcTemplate, and EntityManager beans for each data source

• Use @Transactional annotation with the appropriate data source to specify whic
Answered by AI
Add your answer
Q3. Global Exception handler in Spring boot
Ans. 
Global exception handler in Spring Boot handles all exceptions thrown by the application.
• Global exception handler can be implemented using @ControllerAdvice annotation in Spring Boot.

• It allows centralized exception handling for all controllers in the application.

• You can define methods annotated with @ExceptionHandler to handle specific exceptions.

• Global exception handler can return custom error responses or redirect to
Answered by AI
Add your answer

Writing URLShortener or LoadBalancer in Java

Q1. ACID definition and Isolation levels
Add your answer
Q2. CAP Theoreme and Distributed transactions
Add your answer

Q1. Design patterns
Add your answer
Q2. How hashcode and equals related to each other
Add your answer

Q1. Sort the list, after many queries
Add your answer
Q2. LRU cache with multi level caching
Ans. 
LRU cache with multi level caching involves implementing a cache with multiple levels of storage, where the least recently used items are evicted first.
• Implement a two-level cache system with a primary cache (e.g. in-memory) and a secondary cache (e.g. disk-based).

• Use a data structure like a doubly linked list and a hash map to efficiently manage the cache and track the least recently used items.

• When an item is accesse...read more
Answered by AI
Add your answer

Time ,speed ,distance

Java application using oops concept

Q1. Inheritance , oops
Add your answer

Q1. Tell me about urself
Add your answer