Functional Composability with Lambdas in Java — Originally Published in https://asyncq.com/ Introduction Composition is one of the attractive features that can be built using Lambdas in Java. Often time we need to compose different functions in order to build higher-level functions. In this article, we will deep dive to understand function composability and how we can achieve it…

Best Java Exercises to Improve Java Skills — Introduction This Page consists of a list of Java exercises that will help to increase Java knowledge. The target audience is from Beginners to Intermediate Level. I will keep adding and updating this list moving forward. If you have any recommendations don’t hesitate to write them down in the comment section. …

Intercepting SQL queries and writing custom logic is easy and powerful in Spring Data JPA/Hibernate — Introduction Spring Data JPA is an Object Relational Mapping framework that works as middleware between Java applications and databases. As part of this interaction, one of the core features is to convert entity CRUD operations into SQL and execute it against the database. Now before executing these queries, we may have…

Using Regex to query Postgres database with use cases — TLDR; Discussed what is regex and why to use them. Not all databases support it, Postgres does support regex. We covered how to use regex with Postgres along with some use cases. Regular Expression (a.k.a Regex) Regex is a powerful tool that is widely used for pattern matching and text manipulation. Almost all programming language…

List of Rest clients in Java Ecosystem — Introduction REST APIs have been the center of integration for disparate systems. Java Ecosystem has seen different flavors of Rest Client( native + third party ) that allow consuming these RestFul APIs with abstractions. Design for the Rest Client has been influenced by technology, best practices, and the need for developers…

Solution to Java Interview Problem — Problem We have been given a List of Application Logs which has properties such as id, message, tags, and datetime. We have been given the task of partitioning these logs by created datetime. Example, [ApplicationLog[id=c1e1838c-1c17-4e22-a476-c604dc3dadcc, message=Logs 1, tags=[tag-1, server-4, tag-1], date=Sat Sep 16 21:48:36 EDT 2023], ApplicationLog[id=ca1f45ec-8444-4cb5-8695-08147519080f, message=Logs 2, tags=[data-1, server-1…

Java Resources That Matters! — Table Of Contents Java Blogs ( 14 ) Java Videos ( 5 ) Java Courses ( 5 ) Java Interviews Resources ( 4) Java Jobs Abroad ( With Visa Sponsorship ) ( 10 ) Memes ( 3 ) If you haven’t subscribed, consider subscribing it :) Blogs (14) How to find the source of an…

Solution for Java Interview Problem — Problem We have a query that takes a list of large input IDs and executes them against the database. DB team asked the backend development team to batch this query instead of overwhelming the database with multiple input IDs. So, we have been given a list of input IDs that can…

Solution for Java Interview Problem — Problem We have been given an input JSON file that contains questions with options for quizzes. Our task is to extract these questions from JSON and return it to the list. Input Data The input file contains JSON data for the quiz as shown below. { "quiz": {…