​Разыскивается Senior/ Lead Java разработчик

Компания АО «Гринатом» ищет себе в команду крутого специалиста для работы над продуктом для HR-автоматизации на российском IT-рынке!

Стек проекта: Java 17, Spring, Kafka, GraphQL, PostgreSQL, Redis, Zeebe

Если вы хотите помочь сделать процесс найма сотрудников еще лучше и при этом получать хорошую заработную плату, разрабатывая продукт, которым в будущем будут пользоваться миллионы, то переходите по ссылке. Там подробности, условия и возможность оставить отклик.

#вакансия

Top 10 Online Courses to Learn Data Structure and Algorithms in 2023 - Best of Lot

Hello guys, In the past, I have shared a lot of useful resources like books and tutorials to learn Data Structure and Algorithms for both beginners and experienced programmers. I have also shared a lot of Data Structure and Algorithmic interview questions like this and their solutions in Java. Still, I have got continuously queries about excellent online courses to learn Data Structure and Algorithms in Java. Even though the topics are completely independent with the programming language, Java developer definitely likes the online courses which teach Data Structure and Algorithms in Java, and that's why my recent post about best algorithms courses, which includes algorithms courses from JavaScript and Python didn't impress my readers.


Java Interview questions and tutorials

Read: http://www.java67.com/2019/07/top-10-online-courses-to-learn-data-structure-and-algorithms-in-java.html

How to log messages to File and Console in Java using Log4j? Example Tutorial

Hello guys, if you are wondering how to use a logging library like Log4j or SLF4j in Java then you have come to the right place. In this tutorial, you will learn how to implement logging in your Java program using the Log4j library. Log4j is a Java based open source library from Apache Software Foundation, which is widely used for logging messages in Java applications. In order to use log4j in your application, you first need to download log4j.jar files from https://logging.apache.org/log4j/2.x/download.html site. You can download either the zip version or the tar version depending upon whether you are running your Java program in UNIX or Windows. If you are using Maven then you can also add the following dependency in your pom.xml file and Maven will take care of downloading JAR files.

Java Interview questions and tutorials

Read: http://www.java67.com/2023/08/how-log-messages-to-file-and-console-in.html

How to use Deque Data Structure in Java? Example Tutorial

Hello friends, I am really glad to see you all again here. And I know you are
here to learn new and valuable Java concepts and continue your journey on
Java. Today we are gonna learn something that is really important
logically. yes! you heard right, we are going to learn about Deque data structure in Javaand how to use Deque in the Java program.
Deque is a special data structure, a double-ended queue that allows you to
process elements at both ends, I mean you can add and remove objects from both
front and rear end. It's a short form of Double-Ended Queue and pronounced as
"Deck".
Java Interview questions and tutorials

Read: http://www.java67.com/2021/11/how-to-use-deque-in-java-example.html

What is Backend for front-end pattern in Microservices? How to use it? Example Tutorial

Hello guys, as Organizations embrace Microservices architecture, the need for efficient communication and collaboration between front-end and back-end teams becomes crucial. To address this, theBackend for Front-End (BFF) pattern has emerged as a valuable approach. BFF pattern allows front-end developers to have dedicated back-end services that cater specifically to their needs, enabling them to build user interfaces more effectively.  In the past, I have shared several Microservices design patterns like Event Sourcing, SAGA, Database Per Microservices, CQRS, API Gateway, Aggregator Design Pattern,  and also shared best practices to design Microservices and in this article, I am going to talk about the Backend for Front-End pattern entails and how to effectively utilize it in microservices architecture.

Java Interview questions and tutorials

Read: http://www.java67.com/2023/07/what-is-backend-for-front-end-pattern.html

Свойство типа Controller Service в кастомном процессоре NiFi

В этой короткой статье я хочу показать, как использовать в качестве одного из свойств кастомного процессора NiFi стандартную службу Controller Service, а также как написать тест для такого процессора.В качестве примера будем использовать стандартную службу SSLContextService.


Читать: https://habr.com/ru/articles/752690/?utm_campaign=752690

Использование Kotlin и WebFlux для выполнения задач ML в Apache Spark на GPU

В предыдущей статье для создания Spark Driver приложения использовался сервлетный стек Spring (Boot 2.7.11) и JDK 8.

На дворе вторая половина 2023 года, у многих в проде уже используется Boot 3+ (а то и 3.1+), совсем скоро должна выйти новая LTS версия Java, и, мягко говоря, Boot 2+ и JDK8 устарели. Использовались они намеренно, так как для задач тренировки моделей машинного обучения на GPU в среде Spark частью системы является ускоритель вычислений на GPU NVidia Rapids. Поддержка JDK 17 появилась только в релизе v23.06.0 от 27.06.23, с ее выходом появилась возможность перейти на актуальную LTS версию Java, а с ней - на Spring Boot 3+.

В данной статье описывается миграция с Boot 2 и JDK 8 До Boot 3 и JDK 17, со Spring Web на Spring WebFlux, в конце сравниваются Web и WebFlux версии по потреблению аппаратных ресурсов и скорости выполнения.


Читать: https://habr.com/ru/articles/752702/?utm_campaign=752702

What is Service Discovery in Microservices? Client Side vs Server Side Service Discovery?

Hello guys, if you are wondering how different services communicate with each other in a Microservice architecture then you are not alone. Many Java programmer I have interviewed doesn't really know how different services in a Microservice architecture communicate with each other. n the past, I have shared several Microservices design patterns like Event Sourcing, SAGA, Database Per Microservices, CQRS, API Gateway, Aggregator Design Pattern,  as well as best practices to design Microservices and in this article, I will talk about Service Discovery Pattern. In a distributed system architecture, Service Discovery plays a crucial role in enabling efficient communication between services. Service discovery patterns provide mechanisms for dynamically locating and accessing services within a network.
Java Interview questions and tutorials

Read: http://www.java67.com/2023/06/what-is-service-discovery-pattern-what.html

Из кладовщика в разработчики

В этой статье я расскажу о своем пути от должности рабочего на складе до профессии backend-разработчика в международной компании на Кипре. Также поделюсь практическими советами о том, как можно совершить подобный карьерный переход.


Читать: https://habr.com/ru/articles/752874/?utm_campaign=752874

How to Create a Microservice using Quarkus in Java? Example Tutorial

Hello guys, Microservices architecture has become increasingly popular due to its flexibility, scalability, and ease of maintenance. When it comes to building microservices in Java, Quarkus is an excellent framework that provides a lightweight, fast, and efficient runtime. In this tutorial, we will explore how to create a microservice application using Quarkus in Java, along with a comprehensive step-by-step example. In last few articles, we have seen how to create Microservices using Spring Boot and Microservices using gRPC and in this article, we are going to see how to create a Microservice architecture using Quarkus framework.
Java Interview questions and tutorials

Read: http://www.java67.com/2023/06/how-to-create-microservice-application.html

Cadence 1.0: Uber Releases Its Scalable Workflow Orchestration Platform

Uber released a major version of its workflow orchestration platform named Cadence after six years in development. Uber and other companies use Cadence to build stateful services at scale using native programming languages.
By Rafal Gancarz

Read: https://www.infoq.com/news/2023/08/uber-cadence-workflow-platform/

Java Digest #3

Всем привет! 👋 👋 👋

Мы — Java-разработчики Тинькофф: Константин, Андрей и Арсений. Собираем интересные новости, статьи, туториалы и другие материалы из мира Java-разработки и решили делиться этим со всем сообществом.

«Поскольку крысы не умели читать, собранная им библиотека характеризовалась некоторой причудливостью, однако патриций был не из тех людей, кто игнорирует возможность приобрести новые познания».

Терри Пратчетт «Стража! Стража!»


Читать: https://habr.com/ru/companies/tinkoff/articles/753032/?utm_campaign=753032

Пошушукаемся о Барбаре Лисков или раз и навсегда запоминаем принцип подстановки

Здравствуйте, всем! Хотя это моя первая публикация на Хабре, тему я хочу затронуть важную и далеко не всегда понятную новичкам. Не обращайте внимание на странный заголовок. Считайте, что это – ружье на стене, которое по ходу пьесы обязательно выстрелит.

Материал по этой теме здесь уже имеется, но на мой взгляд, информация там подана не совсем удачно и полно. Рискну внести свою лепту в дело понимания и запоминания такого фундаментального принципа.

В данной статье я постараюсь по максимуму избежать кода. Сделано это в целях повышения универсальности материала, он должен быть интересен всем читателям независимо от их языка программирования. В тех местах, где код неизбежно понадобится, он будет оформлен в синтаксисе Java. Не пугайтесь, все объясню, сложно не будет (во всяком случае, по моим расчетам). Итак, поехали!


Читать: https://habr.com/ru/articles/753282/?utm_campaign=753282

Java News Roundup: Liberica JDK Performance Edition, GraalVM JDK 21 Builds, Open Liberty, Quarkus

This week's Java roundup for July 31st, 2023 features news from OpenJDK, JDK 22, JDK 21, GlassFish 7.0.7, GraalVM JDK 21 Developer Builds, Liberica JDK Performance Edition, JNoSQL 1.0.1, Spring Tools 4.19.1, Open Liberty 23.0.0.8-beta and 23.0.0.7, Micronaut 4.0.3, Quarkus 3.2.3 and 2.16.9, Apache Camel 4.0.0-RC2, JHipster Lite 0.40, Ktor 2.3.3, Maven 3.9.4 and Gradle 8.3-RC3.
By Michael Redlich

Read: https://www.infoq.com/news/2023/08/java-news-roundup-jul31-2023/

How to create a Microservice in Java using gRPC? Example Tutorial

Hello guys, if you are wondering how to create Microservices in Java then you have come to the right place. Microservices architecture has gained significant popularity due to its
scalability, modularity, and ease of deployment. When it comes to building
microservices, gRPC (Google Remote Procedure Call) is an excellent choice for
facilitating communication between services. In last few articles, I have shared how to build Microservices in Java using Spring Boot and How to build Microservices app using Quarkus and In this article, we will explore
how to create a microservice application using gRPC in Java, along with a
comprehensive step-by-step tutorial.

Java Interview questions and tutorials

Read: http://www.java67.com/2023/07/how-to-create-microservice-application.html

Kafka UI краткий гайд

Буквально недавно я начал создавать свой аналог сервиса Discord, используя веб-сокеты и передавая сообщения через очередь. В один из моментов мне понадобилось проверить, корректно ли проходят сообщения в этой очереди. Тогда я осознал, как неудобно каждый раз заходить в docker контейнер и вручную вводить команду для просмотра всех сообщений в топиках. После дня анализа и советов от моего коллеги, опытного DevOps-инженера Паши, я пришел к выводу, что kafka-ui от команды provectus — это наилучший и наиболее удобный инструмент для визуализации данных в Kafka.


Читать: https://habr.com/ru/articles/753398/?utm_campaign=753398

Top18 Spring Cloud Features for Microservices Architecture in Java

Hello guys, If you are doing Java development using Spring Boot then you may already know that Spring Cloud is a popular open-source framework for implementing microservices in Java. It provides a wide range of features that simplify the development, deployment, and management of Microservices in Java. In this article, we will discuss some of the key features of the Spring Cloud framework that makes it an excellent framework for developing Microservices in Java. Microservices architecture is a modern approach to building complex applications as a collection of loosely coupled, independently deployable services.
Java Interview questions and tutorials

Read: http://www.java67.com/2023/04/spring-cloud-features-for-microservices.html

OpenJDK plan would add computed constants to Java

Read: https://www.infoworld.com/article/3704272/openjdk-plan-would-add-computed-constants-to-java.html#tk.rss_java

Difference between @RequestParam and @PathVariable in Spring MVC

Hello guys, if you are wondering what is difference between @ReqestParam and @PathVaraible annotation in Spring MVC, most likely because it was asked to you on a Java and Spring interview or maybe you are just curious then you have come to the right place. In the past, I have talked about difference between @Component, @Service, @Reposistory and @Controller annotations and in this comprehensive article we are going to take an in-depth look at the difference between the two most frequently used annotations in Spring MVC. It provides two commonly used annotations, namely @RequestParam and @PathVariable, which play a significant role in parameter handling within web applications.
Java Interview questions and tutorials

Read: http://www.java67.com/2023/08/difference-between-requestparam-and.html

Java Joins the Ranks in Semantic Kernel SDK

Microsoft has announced the availability of its Semantic Kernel software development kit (SDK) for Java, designed to mesh Large Language Models (LLMs) with popular programming languages, extending support beyond C# and Python.
By Shaaf Syed

Read: https://www.infoq.com/news/2023/08/semantic-kernel-java/