Q1. What is a JPA? What are its key components? A1. The process of mapping Java objects to database tables and vice versa is called “Object-relational mapping” (ORM). The Java Persistence API provides Java developers with an object/relational mapping (ORM) facility for managing relational data in Java applications. … Read...
The SAR (Situation-Action-Result) technique is very useful to tackle open-ended questions like:
1. What were some of the challenges you had encountered,
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Q1 How will you go about implementing the following validation rules for a user name?
— user name must be between 2 and 17 characters long.
— valid characters are A to Z, a to z, 0 to 9, . (full-stop), _ (underscore) and –
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Performance testing is an important process of any software development. You can bring this up yourself to many open-ended questions like — Tell me about yourself? What are some of your recent accomplishments that you are proud of? Setting up a performance/load test script is always the first step in...
Java Garbage Collection interview questions & answers to ascertain your depth of Java knowledge in building industry strength Java applications. Determining optimal Garbage Collection (GC) settings is critical to achieve high throughput & low latency.
Q1. In which part of memory does Java Garbage Collection (i.e.
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Q1. What is a Transaction? A1. A transaction is a set of operations that should be completed as a unit. If one operation fails then all the other operations fail as well. Example 1: If you transfer funds between two accounts there will be two operations in the set Operation...
Q1. What is JNDI? And what are the typical uses within a JEE application? A1. JNDI stands for Java Naming and Directory Interface. It provides a generic interface to LDAP (Lightweight Directory Access Protocol) and other directory services like NDS (Novell Directory Service), … Read more ›...
Q1. What do you understand by client side and server side view technologies? A1. There are client side & server side view technologies available. Server side view technologies In server-side view technology the most of the page rendering happens on the server side. … Read more ›...
Most feasible way to handle consistency across microservices is via eventual consistency. This model doesn’t enforce distributed ACID transactions across microservices. Event sourcing is an event-centric approach to business logic design and persistence. It favours to use some mechanisms of ensuring that the system would be eventually consistent at some...
Flyweight pattern is about sharing a collection of objects. The flyweight design pattern is a structural pattern used to improve memory usage and performance (i.e. due to shorter and less frequent garbage collections) by creating fewer objects. Instead of creating a large number of objects, we reuse the objects that...
Q. What is a first-level cache in Hibernate? A. First-level cache always is associated with a “Session” object. Hibernate uses this cache by default. You can’t turn it off. Hibernate caches the SQL statements like insert, update, delete, etc in the first-level cache. By default, … Read more ›...
1. Firstly, reflect back on your past experiences and achievements by going through your resume to sell yourself more effectively. “Think of situations where you have”
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Generics in Java can be be a bit tricky to get your head around. Hope the explanation below enhances your understanding of generics. This complements 5 Java generics interview Q&As with examples. Raw List, List <Object>, and List<?> A raw List: is a heterogeneous mixture or a mixed bag that...
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