Чашечка Java

MicroProfile 6.0 Delivers Alignment with Jakarta EE 10 and a New Specification In a major move for the Java community, the MicroProfile Working Group has officially released MicroProfile 6.0. This anticipated release brings a host of new features and improvements, including alignment with the Jakarta 10 Core Profile and updates to several key specifications, such as Metrics, JWT Authentication, Open API, Reactive Messaging, and Reactive Streams Operators. By A N M Bazlur Rahman Read: https://www.infoq.com/news/2023/01/microprofile6-delivers-alignmens/

Пишем бота-кликера на Kotlin для Lineage 2 Еще не все новогодние салаты были съедены, “Ирония судьбы” уже просмотрена, а до начала рабочей недели еще целая вечность и нужно было придумать себе развлечение на оставшиеся праздники. Предвкушая ностальгию я открыл Lineage 2, одну из самых популярных MMORPG “нулевых” на СНГ пространстве. Однако, самому играть уже не хотелось и пришла идея автоматизировать это дело. За подробностями под кат! Читать: https://habr.com/ru/post/711168/?utm_campaign=711168

10 Tools Every Software Engineer Should Learn In 2023 Hello guys, as a software engineer, staying up-to-date with the latest tools and technologies is essential to your success and one way to keep yourself up-to-date is to learn new framework, libraries and tools. Earlier, I have shared 5 Java Frameworks to learn in 2023 and in this article, we will introduce you to 10 tools that every software engineer should learn in 2023. The list includes, both essential and advanced tools from Git and Docker to TypeScript and GraphQL, which you will need in your day to day development, particularly on web development. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/10-tools-every-software-engineer-learn.html

Java News Roundup: MicroProfile 6.0, Kotlin 1.8, Spring Framework Updates This week's Java roundup for January 9th, 2023, features news from JDK 20, JDK 21, Spring Framework 6.0.4 and 5.3.25, Spring Data 2022.0.1 and 2021.2.7, Spring Shell 2.1.5 and 3.0.0-RC1, MicroProfile 6.0, Quarkus 2.15.3, Micronaut 3.8.1, Micrometer Metrics 1.10.3, Micrometer Tracing 1.0.1, Project Reactor 2022.0.2, Piranha 23.1.0, Apache Tomcat 9.0.71, JHipster Lite 0.26.0 and Kotlin 1.8.0. By Michael Redlich Read: https://www.infoq.com/news/2023/01/java-news-roundup-jan09-2023/

​Как написать на Java и Spring Boot Telegram-бот? Но это будет не просто бот. Он будет вести подсчёт сообщений от пользователей и записывать результата в БД. Подробнее в статье: https://tproger.ru/articles/telegram-bot-schjotchik-soobshhenij-na-java-i-spring-boot/

Управление зависимостями в IntelliJ IDEA В этом руководстве, в продолжение темы просмотра зависимостей, мы рассмотрим управление зависимостями в IntelliJ IDEA. Мы рассмотрим различные способы добавления зависимостей в ваш проект, а также способы добавления, обновления и удаления зависимостей с помощью Package Search. Читать: https://habr.com/ru/post/710802/?utm_campaign=710802

ПОВЫШЕНИЕ ЭЛЕКТРОБЕЗОПАСНОСТИ При производстве работ в электроэнергетике желательно обеспечить дополнительный контроль за работой производимой на высоковольтном оборудовании для безопасности работ и последующего анализа действий при несчастном случае. Для выполнения вышеуказанного условия предлагается данная система сбора информации с различных датчиков. Сбор данных происходит с помощью приложения устанавливаемого на сотовый телефон, который может находится как у непосредственного исполнителя; либо у наблюдающего за работой; либо у обоих. Связь датчиков с сотовым телефоном по Bluetooth. Полученные данные накапливаются в телефоне, а также одновременно передаются в определенный Telegram-канал с идентификационными данными пользователя (код компании/фамилия, имя). По идентификационным данным в телеграмм-канале производителя устройств возможна сортировка полученных данных. Кроме регистрации показаний датчиков сигнализирующих об опасности поражения электрическим током, предусмотрено отображение показаний подключаемых цифровых приборов. Информация от датчиков передается по Bluetooth BLE в наименовании устройства в режиме advertising – посылки «рекламы» (18 байт). Читать: https://habr.com/ru/post/710858/?utm_campaign=710858

Движение по магистрали без аварий. Или как передавать 1,5 терабайта в сутки и ни одного не потерять? Привет, Хабр. Меня зовут Владимир Евсеев, я Senior Java developer, Teamlead в SSP SOFT. Наша команда приступила к масштабному проекту: системе, обеспечивающей транспортный уровень документооборота банка. Сегодня я расскажу, как мы справились с первым этапом: выстроили магистраль, способную передавать около 150 000 файлов в сутки, или 1,5 терабайта информации. Поделюсь, что получилось и что еще предстоит  довести до совершенства. Читать: https://habr.com/ru/post/710770/?utm_campaign=710770

What is CQRS - Command Query Responsibility Segregator Pattern in Java? Example Tutorial Hello guys, if you are wondering what is CQRS pattern and when and how to use it in your Microservices then you have come to the right place. CQRS is one of the 10 essential Microservice pattern and can be used when your application is either read heavy or write heavy and reading and writing requirement are very different. It aims to separate your app into two parts, command part which writes data and query part which read data and that's how it allows you to develop, scale and optimize them separately. It's also one of the popular Microservices Questions and if you are preparing for interviews, you should prepare this pattern as well. Earlier, I have explained SAGA Pattern and Database Per Microservice pattern and in this article I will explain CQRS pattern, when to use it and what problem does it solve. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/what-is-cqrs-command-query.html

10 examples of crontab commands in Linux Hello guys, if you are working in Linux or UNIX environment and scheduled any job or script to run at a particular time at everyday like a script to archive log files at midnight or a script to restart your app on Monday morning then you must have come across crontab commandin Linux. While there are many solution to schedule jobs in enterprise application like Control M from Bmc Software and AutoSys but the crontab command provides the easiest way to schedule any script in Linux, as you don't need any third party software for scheduling. It's also quite popular, so much so that all the jobs scheduled by crontab is called cron jobs, and that's why I think every developer should know about crontab command and how to use it. Java Interview questions and tutorials Read: http://www.java67.com/2022/08/10-examples-of-crontab-commands-in-linux.html

When to use PUT or POST in a RESTful API and Web Service? Answer Hello guys, if you are confused about whether to use PUT or POST for updating a resource using RESTful web service then you have come to the right place. In the past, I have shared the best RESTful web service books and courses and today, I am going to share some tips to choose between PUT and POST while designing your RESTful web services. Btw, you are not alone, one of the most common confusion among web developers is the choice of PUT or POST HTTP method for creating and updating a resource while developing RESTful Web Services. Since both can be used to submit data, you can use either POST or PUT to create or update a resource. Java Interview questions and tutorials Read: http://www.java67.com/2016/09/when-to-use-put-or-post-in-restful-web-services.html

10 Examples of New HttpClient + HttpRequest + HttpResponse In Java 11 (REST Client] Hello guys, one of the notable addition in recent Java release is the full fledged HttpClient from Java. This is one of the class or utility which was much needed in Java. It was quite surprising that JDK doesn't have any fully functional HTTP client to connect to REST APIs in this world of API Integration. Until Java 11, Java developer rely on classes like RestTemplate and WebClient from Spring Framework to make HTTP class to REST APIs, but now you don't need to include Spring Framework in your project just for that. You can now use HttpClient classand its support classes like HttpRequest and HttpResponse to make both synchronous and asynchronous HTTP calls in Java. Java Interview questions and tutorials Read: http://www.java67.com/2022/12/10-examples-of-java-httpclient.html

Java + Spring Boot + Microservices Example - Step by Step Guide Hello guys, if you are wondering how to create a Microservice in Java and Spring Boot then you are ar the right place. In the past, I have shared best Spring Boot courses for Microservices, Interview Questionsas well as essential Microservice design principles and patternslike circuit breaker, CQRS, Event sourcing etc and In this article, we will cover the fundamentals of microservices with Spring Boot utilizing Spring cloud. We will cover a few fundamental ideas and then we will make a little micro-service to give you an outline. I will also share step by step guide to make Microservices in Java and then deploy them using Docker and Kubernetes on Cloud. Java Interview questions and tutorials Read: http://www.java67.com/2022/08/java-spring-boot-microservices-example.html

[Solved] java.lang.ClassNotFoundException: org.Springframework.Web.Context.ContextLoaderListener in Java and Spring Problem :You are getting java.lang.ClassNotFoundException : org.Springframework.Web. Context.ContextLoaderListener in your Spring-based Java Web application. Cause: This error comes when you are using the Spring MVC framework in your Java Web application and configured org.springframework.web.context.ContextLoaderListener as a listener in your deployment descriptor also known as web.xml, but the JAR which contains this class is not available in the web application's CLASSPATH. Java Interview questions and tutorials Read: http://www.java67.com/2015/06/org.Springframework.Web.Context.ContextLoaderListener.html

How to fix org.springframework.beans.factory.BeanCreationException: Error creating bean with name X [Java Spring] If you are using the Spring framework in your Java application and getting this error during startup it means Spring is not able to initialize the bean X and add it into its application context, Why? There could be multiple reasons like a typo on the spring bean name. Let's take a closer look at the stack trace to find out the real reason: BeanInstantiationException: Could not instantiate bean class [X]: No default constructor found; nested exception is java.lang.NoSuchMethodException: X.() Here X is the class, which is declared as Spring bean. The error clearly says that the default constructor is not present in class X. Java Interview questions and tutorials Read: http://www.java67.com/2017/07/solving-orgspringframeworkbeansfactoryb-beancreation-exception-java-spring.html

10 Git Commands Every Programmer Should Learn In 2023 (with ChatGPT Examples) Hello guys, Git is one of the most important skill for programmers, developers and data scientist and if you don't know git then you will struggle working in a team. If you want to learn Git in 2023 then you can start with these essential Git commands. I have explained the command and give you example. For examples, I have asked ChatGPT to see how it explains and I was amazed to see the response so I have included here for my own reference. I don't if ChatGPT will remain free forever but I am taking screenshot for the questions which I am asking so that I can keep a record for myself and you in future as ChatGPT is the best instructor I have got today and its helping me to learn and revise several key concepts. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/10-git-commands-every-programmer-should.html

Difference between Serializable vs Externalizable in Java - Interview Question Serializable vs Externalizable What is the difference between Serializable and Externalizable in Javais famous core Java interview questions and for some of them its one of those difficult Java question, which no one wants to see in Java interview. I was in that category until I read Effective Java and explored How Serialization works in Java and find out more about the Serialization process. What makes Serialization questions tricky is, Serialization as a persistence mechanism is not very popular. Many programmers prefer databases, memory-mapped files, or simple text files over Serialization. But Serialization has a distinguished advantage over these mechanisms. Java Interview questions and tutorials Read: http://www.java67.com/2012/10/difference-between-serializable-vs-externalizable-interface.html

What is ContextLoaderListener in Spring MVC? Example Tutorial The ContextLoaderListner is one of the essential components of the Spring MVC framework, probably the most important after the DispatcherServlet itself. It is used to create the root context and responsible for loading beans, which are shared by multiple DispatcherServlet like beans related to the service layer and data access layer. In general, When you develop Spring MVC based web applications and also using Spring in the services layer, you need to provide two application-contexts. The first one is configured using ContextLoaderListener, and the other is set using DispatcherServlet. The DispatcherServlet is responsible for loading web component-specific beans like controllers, view resolvers, and handler mappingswhile, as I said before, ContextLoaderListener is accountable for loading middle-tier and data-tier beans which forms the back end of Spring applications. Java Interview questions and tutorials Read: http://www.java67.com/2019/05/contextloaderlistener-in-spring-mvc-10.html

What is the use of DispatcherServlet in Spring MVC? Interview Question Example Hello guys, In today's article we are going to discuss one interesting and the important Spring MVC concept, which is also a popular Spring Interview question. How DispatcherServlet works internally in Spring MVC or What is the role of DispatcherServlet in Spring MVC are some of the frequently asked Spring MVC Interview Questions. You might have seen them already during your previous Java web development interviews but if you have not, it's a good question to know. In this article, I'll answer these questions by explaining What is DispatcherServlet and its importance in Spring MVC. The DispatcherServlet is one of the important components of the Spring MVC web framework and acts as a Front Controller. Java Interview questions and tutorials Read: http://www.java67.com/2017/06/what-is-use-of-dispatcherservlet-in-spring-mvc.html