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Q2521. Why Java has final class ?

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Q2522. While working on a web application, you are informed that there is no new data in Database for last few hours ? How would you go about debugging this problem ?

Solution

Ans. Will look into access logs to see if web application is getting any traffic. If not , then will inform the server support team.

Will look into intermediary infrastructure , queues , streams etc to see if there is any choke or throttle there.

If there is any throttle at any point, would make request for either debugging the cause or increasing the infrastructure. For ex - increasing shards in Kinesis.

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Q2523. Set Locators priority wise in selenium WebDriver.

Selenium

Ans. Id locators,Name locators,CSS locators,Xpath locators,DOM locators

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Q2524. Which memory segment is cleaned by Garbage Collection - stack or heap ?

Core Java

Ans. Heap as objects are stored ink heap.

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Q2525. If you are told that we don't have any data in database for last 5 days being populated by

1. a web service
2. that in turn write a message to a queue
3. which is then picked by a consumer
4. and then written to DB by consumer.

How would you go about debugging this issue ?

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Q2526. Do we have references for the objects that are eligible for garbage collection ?

Core Java

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Q2527. Have you worked on Linux Systems ?

General

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Q2528. What is OSGI ?

OSGI

Ans. OSGI is open service gateway initiative, its used as java framework for developing and deploying the modular softwares.

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Q2529. What is the use of load-on-startup ?

Design

Ans. The load-on-startup element of web-app loads the servlet at the time of deployment or server start if value is positive. It is also known as pre initialization of servlet.You can pass positive and negative value for the servlet.

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Q2530. Are final methods faster than regular instance methods ?

Core Java

Ans. Yes. As they cannot be overridden , there is no use of virtual table concept which is used for dynamic binding resolution.

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Q2531. What is virtual table with respect to method overriding in Java ?

Core Java

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Q2532. How is the virtual method table implemented in Java?

Core Java

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Q2533. How many VTables are there for each class ?

Core Java

Ans. There is one VTable for each class.

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Q2534. Can an In Memory Data Management play a significant role for Big Data Analytics?

BigData

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Q2535. Explain the use of Client certificates for authentication ?

Authentication

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Q2536. How cookies helps by storing encrypted passwords ?

Authentication

Ans. It helps user autofill password on the form where its presented for authentication

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Q2537. Have you ever worked with encrypted Tokens and How ?

Authentication

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Q2538. How did you use authentication in node.js ?

Node,js

Ans. Using JWT

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Q2539. How to deal with double hop authentication issue?

Authentication

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Q2540. Have you ever used java.util.Objects class ?

Core Java

Ans. Yes, We are using requireNonNull method for validating if the object is null.

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Q2541. Why do we use getbytes in Java?

Core Java

Ans. It is used to convert String into an array of bytes.

byte[] getBytes() - converts String into a byte array.

byte[] getBytes(Charset charset) - converts String to byte array, based on charset encoding.

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Q2542. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?

Server

Ans. We can provision more instances for that particular time slot.

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Q2543. Why AWS is better than Azure ?

Cloud Computing

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Q2544. Can Java be run on hardware with just the JVM and no OS ?

Core Java

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Q2545. Which java feature is used to convert primitive type to reference type ?

Core Java

Ans. AutoBoxing

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Q2546. What is a reflexive equals contract ?

Core Java

Ans. An equal contract is said to be reflexive is equality between 2 objects always returns to be true.

For example -

Object o1;
Object o2;

o1.equals(o2); // returns true
o2.equals(o1); //returns true

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Q2547. Explain Transitive equals contract.

Core Java

Ans. The equals contract is said to be transitive if

obj1.equals(obj2); and obj2(.equals(obj3)

then obj1.equals(obj3) also returns true.

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Q2548. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q2549. Have you ever been in a situation where any of strength became a weakness in some other setting ?

General

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Q2550. What is your greatest fear ?

General

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