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Tech forum for Java, algorithms & data-structures, Hibernate, RESTful API, Spring framework, Microservices architecture, Interview questions, Python, SDET, Machine learning, DevOps.

Difference between ExecutorService submit and execute method

Upasana | June 23, 2022 | 2 min read | 17 views

You should prefer to use submit() method because it gives more flexibility to the programmer in terms of execution control i.e. you can check status of task, cancel a task or get the results of task. Additionally a better exception handling is possible using submit().

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AWS Java SDK v2 - S3 File upload & download

Upasana | November 04, 2021 | 4 min read | 4,118 views | AWS Tutorials

In this tutorial, we will walk through new AWS Java SDK v2 for doing object level operations on S3 bucket. We will specifically cover PutObject, GetObject and GetUrl operation on S3 Objects using AWS SDK v2 S3Client

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AWS Lambda Interview Questions for Developers

Upasana | October 23, 2021 | | 0 views | Python Coding Problems AWS Tutorials

AWS Lambda Interview Questions for Java, Python and Kotlin developers - What is AWS Lambda, What are pros and cons of using lambda, etc.

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Install RabbitMQ and Erlang 23 on Ubuntu 20

Upasana | September 04, 2021 | 2 min read | 552 views

This article will walk you through Erlang 23 and RabbitMQ installation on Ubuntu 20 focal server using apt.

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Part 3: Dockerize Flask application and build CI/CD pipeline in Jenkins

Upasana | February 09, 2021 | 3 min read | 2,177 views | Flask - Python micro web framework

This article covers Flask API Containerization using Docker, Setting up CI/CD pipeline using Jenkins and Cloud deployment

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Spring RestTemplate Basic Authentication

Upasana | December 26, 2020 | 3 min read | 2,287 views

We will configure RestTemplate with basic authentication credentials in a Spring Boot application using RestTemplateBuilder.

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Given a collection of 1 million integers, all ranging between 1 to 9, sort them in Big O(n) time

Upasana | November 22, 2020 | 2 min read | 669 views | Java Coding Challenges algorithm-datastructures

This is a typical Integer Sorting problem with a constraint that the number range to sort is very limited in spite 1 million total entries. Integer Sorting with limited range is achieved efficiently with Bucket Sorting.

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Goldman Sachs Java Interview Questions

Upasana | November 22, 2020 | 4 min read | 3,022 views | investment banking

Goldman Sachs Java Interview Questions on core java problems, coding challenges, data structures and algorithms, performance issues, design problems, and testing aspects.

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50 microservices interview questions for Java developers

Upasana | November 22, 2020 | 2 min read | 1,250 views | microservices-architecture

50 Spring Microservices interview questions for experienced Java Developers - core concepts, oauth2 security, testing microservices, deployment patterns, and best practices

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Dialoglfow fulfillment with Spring Boot

Upasana | November 21, 2020 | 2 min read | 649 views

In this tutorial we will learn how to implement Google Dialogflow response fulfilment webhook API with a Spring Boot application.

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