Tech Key Areas (16+ ) FAQs Archives | Page 13 of 16 | 800+ Java & Big Data Interview Q&As

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Preventing XSS attacks in Java

Cross Site Scripting (XSS) is one of the most common security problems in today’s web applications, and the second most common is the SQL injection attack. Both account for ~ 70% to 80% of the security threats of which XSS attacks are accountable for ~ 50% to 60%. Q1. …...

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Processing large files efficiently – BigData & Hadoop – part 3

Q1. What are the different data sizes, and what technologies can be used to process them? A1. In general, data sizes can be classified as shown below. 1) Small size data is < 10 GB in multiple files. … Read more ›...

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Processing large files efficiently in Java – multi-threaded code – part 2

If you want to process medium sized data (e.g. 2 GB to 100 GB in multiple files) in Java, consider writing a batch job with Spring batch or Java EE 7.0 batch processing. If processing requires access to other systems, use “spring integration” … Read more ›...

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Prometheus monitoring interview Q&As

Prometheus is an observability & monitoring tool that integrates well with Grafana for visualisation. Prometheus differs from Loki by focussing on metrics instead of logs. Q01. What is Prometheus monitoring? … Read more ›...

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Proxy design pattern in Java with service retry example

Design pattern: If you are asked to describe or talk about a design pattern, you could mention this dynamic proxy class as a proxy design pattern. Many pick either singleton or factory design pattern. It would be nicer to pick something other than these two common patterns. … Read more...

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QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability – Non Functional Requirements

Q1. What are the system qualities that typically form a basis for QoS requirements? A1. Quality of service (QoS) covers Non Functional requirements such as As microservices use disparate datasources like SQL store, NoSQL store, Cache, Object store like AWS S3, … Read more ›...

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Remote debugging in Java with Java Debug Wire Protocol (JDWP)

What is remote debugging? It is increasingly essential with the globalization to be able to debug a Java application that is deployed remotely, in another country or city. You will come across scenarios where an application might be running fine in your sandbox (i.e. local desktop), but might be buggy...

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Remotely debugging Spark submit Jobs in Java

This extends Remote debugging in Java with Java Debug Wire Protocol (JDWP) to debug Spark jobs written in Java. We need to debug both the “Driver” and the “Executor“.

Debugging the Spark Driver in Java

Step 1: Run the Spark submit job in the remote machine,

…

SDLC process interview Q&As

No right or wrong answers. The depth and quality of the answers will can prove your seniority and experience. Q1. What are the SDLC activities you perform as a Java developer? A1. Don’t get overwhelmed by this activities list. This proves why employers favor experience to just academic qualifications alone....

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Security holes & how to fix them interview Q&A

Security is of paramount importance to any application or website. Applications with security vulnerabilities can not only tarnish the reputation of a company, but also can adversely impact the bottom-line of that organization. So, it really pays for the organizations to have the right people who can identity potential security...

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sed and awk to write shell scripts for Java developers

Q. How would you go about replacing a piece of a text or a phrase from 20,000+ web templates residing on a Unix file system? Even some candidates with 5+ years of experience will be tempted to spend a day or two to write 200+ lines of code to achieve...

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Session Hijacking prevention Questions & Answers

Q1. Does the following code pose any security risk? if yes, how will you fix it?

if(cartId == null){
    cartId= getCartId(...);
    Cookie cookie = new Cookie(UserInput.CART_ID_KEY, cartId);
    response.addCookie(cookie);
}

if(cartId == null){

cartId= getCartId(...);

Cookie cookie = new Cookie(UserInput.CART_ID_KEY, cartId);

response.addCookie(cookie);

}

A1. The above code is a security risk. Never store sensitive data in a cookie. Instead, save it in the session on the server side, … Read more ›...

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Source control system and subversion (aka SVN) Q&A

Q. Why do you need a source control system?
A. Source Control systems like subversion is a must if you are writing Java code by yourself or as a team. It allows multiple streams of coding, tracks the changes in your code and allows you to roll back to previous versions.

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Blog Archives

Preventing XSS attacks in Java

Processing large files efficiently – BigData & Hadoop – part 3

Processing large files efficiently in Java – multi-threaded code – part 2

Prometheus monitoring interview Q&As

Proxy design pattern in Java with service retry example

QoS & SLAs interview Q&As on Availability, Serviceability, Fault tolerance & Disaster Recoverability – Non Functional Requirements

Remote debugging in Java with Java Debug Wire Protocol (JDWP)

Remotely debugging Spark submit Jobs in Java

SDLC process interview Q&As

Security holes & how to fix them interview Q&A

sed and awk to write shell scripts for Java developers

Session Hijacking prevention Questions & Answers

Source control system and subversion (aka SVN) Q&A

300+ Java Interview Questions - FAQs

10+ Companion Techs Interview Q&As

300+ Big Data Interview Questions - FAQs

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