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Micronaut offers ahead-of-time compilation, reactive NIO, and cloud-native support for microservices.
I spent over a decade as a consultant working for dozens of companies in many fields and pursuits.
Get an overview of JDBC's architecture, then learn how to connect to a database and handle SQL queries.
In this tutorial, get a glimpse of applications of Java Lambdas and Streams in Selenium to simplify.
Virtual threads, pattern matching for switch expressions, a vector API, and a Linux/RISC-V port are slated for Java 19, a non-LTS release of standard Java.
In this article, learn about htmx and how it can help you reuse elements on the server, reduce the amount.
Vulnerabilities produce enormous reputational and financial risks. As a result, many companies.
Dive into data lakes—what they are, how they're used, and how data lakes are both different.
If you are into computer vision, you probably are familiar with OpenCV. It's an amazing library that has almost.
ECMAScript 2021 highlights include replaceAll(), promise.any(), AggregateError, and new logical.
Written from firsthand SRE experience, this article touches on the importance of SREs and some of the key.
Invented for Linux kernel development, Git version control now powers millions of projects across the globe.
This article discusses the basic concept of JDK8 and upwards memory management with heap and stack.
Machine learning workloads require large datasets, while machine learning workflows require high data.
A lot of apps still work on Java 8 — and it is easy to see why. It is still supported by many vendors.
Lit is a fast, lightweight, reactive framework for building web components that work just about anywhere. Let's get started with Lit.
Here is a real-world thread dump report of an application that was suffering from this problem.
Race conditions can occur when a multithreaded application accesses a shared resource using over.
Polymorphism is an Object-Oriented-Programming concept. Whether you are new to Java programming.
What is CORS (Cross-Origin Resource Sharing)? In this Spring Boot video tutorial, we take a closer.
Time flew by and JDK 18 GA is around the corner. Let me summarize changes and in particular improvements in Hotspot´s stop-the-world garbage collectors.
The RISC-V ISA is actually a family of related ISAs, of which there are currently four base ISAs. Each base ISA can be configured with one or more standard extensions.
I believed (and still do) that it should be a thing of the past. Yet, it seems its usage is still widespread. I do not deny there are some valid reasons to transform data.
In the video below, we take a closer look at Spring Boot and update user details in an API test client using REST.
According to some surveys such as that of JetBrains, version 8 of Java is currently the most used by developers all over the world, despite being a 2014 release.
In the video below, we take a closer look at the Spring.
Project Loom introduces lightweight and efficient virtual threads called fibers, massively increasing resource.
This third article in a series on thread synchronization describes volatile fields, final variables, atomic.
Make sure your Java application knows that a “five-star” review is positive, not neutral, when it performs.
In this Spring Boot video tutorial, take a closer look at the User Login API Test Client and API automation.
In this video tutorial, take a closer look at Spring boot.
No programmers are happier with their language than Rust programmers. And if you know Java, you’ll find Rust relatively easy to learn.
How to use Java 17 new features, i.e. Records, Switch Expression and Pattern Matching for Switch.
Sentiment analysis tells you if text conveys a positive, negative, or neutral message. When applied to a stream.
My experience has taught me to favor strong typing and avoid typos. In this post, I want to list down some alternatives to using String for you to do the same.
In the video, we take a closer look at Domain Logic.
I just published the 3rd episode of the "140 Second Duckling" tutorial series and I'm getting into the rhythm of doing them. I posted the 2nd episode last week.
JDK 18 introduces configurable card table card sizes with JDK-8272773. This post tries to show you what the card table is, and why you might want to play around with this new option.
OpenJDK is the development kit for Java, the language with 26 years of history behind it. It is not a new language by any standards, especially in the industry.
The OpenJDK Quality Group promotes the testing of FOSS projects with OpenJDK builds as a way to improve the overall quality of the release.
R.java plays a vital role in Android application advancement. It is utilized to distinguish all assets' information; for example, ID, format, picture, drawable.
In this post, learn how to use the Let's Encrypt tool with Spring Boot to generate HTTPS certificates and automatically renew them.In my previous blog post, we became familiar with the configuration.
Dependency Injection is one of the core features in the heart of modern application development frameworks. In a nutshell, the process of dependency injection.
The OpenJDK Quality Group promotes the testing of FOSS projects with OpenJDK builds as a way to improve the overall quality of the release.
Java serialization is a popular mechanism where you are able to serialize and deserialize complex object graphs; for example where object A can contain a reference.
Take a closer look at the Visitor Design Pattern in Java. This video tutorial includes an introduction, real-time examples, a class diagram, and implementation.In the video below, we take a closer look at the Visitor Design.
This article will get you started with the Hibernate implementation of JPA. We will use only standard features and cover the basics to provide an overview. JPA was born as the acronym for Java Persistence API.
In this video tutorial, take a closer look at the adapter design pattern in Java (Mobile Charger) with an introduction, example, implementation, and more.
In the video below, we take a closer look at the Interpreter Design pattern in Java. This tutorial includes an introduction, real-time examples, a class diagram, and implementation. Let's get started.
Inside.java is a collection of curated content produced by members of the Java Platform Group at Oracle. Content includes blog posts, mailing list activity, conference talks.
Java’s finalize method will be deprecated in Java 18 and removed entirely in a future release. Let’s look at the alternatives.
In this post, we're going to see how to configure and implement database operations using Reactive Programming through Spring Data Reactive Repositories.
Learn about the thread pool and how to create it in Java from scratch. This post includes an intro, implementation, and testing of a simple thread pool version.
Record classes enhance Java’s ability to model plain-data aggregates without a lot of coding verbosity or, in the phrase used in JEP 395, without too much ceremony.
Welcome to “Curly Braces,” Eric Bruno’s new Java Magazine column. Just as braces (used, for example, in if, while, and for statements) are critical elements.
GraalVM is an open source project from Oracle that includes a modern just-in-time (JIT) compiler for Java bytecode, allows ahead-of-time (AOT) compilation.
A guide for Java developers who want to integrate Spring Boot Webflux applications with a remote LDAP server and authenticate/authorize their users with JWT.
A top priority for Java apps — whether running on physical servers, VMs, or in the cloud — is continuous availability, which can create a costly burden.
Within programming, object orientation (also known as OOP) is one of the wealthiest paradigms in documentation and standards, as with dependency.
The incredible amounts of data collected by digital technologies have created an explosion of big data analysis. It allows companies, governments.
In the video below, we take a closer look at the Flyweight Design pattern in Java. This tutorial includes an introduction, real-time example, implementation, and key points. Let's get started!
In my previous article, we covered authentication and authorization with remote LDAP servers in Spring Web MVC. Since base concepts are the same, some sections.
While the use of objects in object-oriented languages such as Java provides an excellent way of abstracting away complexity, frequent object creation can come.
Reach for these low-level Java APIs when you need to move a lot of file data or socket data quickly. This article is about achieving high performance in terms of file.
From using jconsole to monitoring uncaught exceptions, here are a dozen tips that may be worth trying before you launch your favorite IDE’s debugger.
The features released between Java 11 and Java 17 have brought a greater opportunity for developers to improve application development productivity as well and code expressiveness and readability. In this deep-dive session.
The game of Minecraft most definitely has an end, quite literally. There is a realm in Minecraft called the End, where players can go to finish the game.
This article tells the history behind one of the most trending IntelliJ IDEA plugin - JPA Buddy. Also, it provides some insights about issues using JPA, Hibernate, Spring Data, etc.
In this article, I'll show you how to package and distribute a java command-line application and the challenges one has to face to implement it.
This article explains what NullPointerException is with its common causes and best practices you can do to avoid NPE. Read on to find out more!
In the video below, we take a closer look at Lazy Load Design Pattern in Java with an introduction and implementation. Let's get started!
In this post of our series “Stranger things in Java” - dedicated to Java insights, we will try to clarify the use of the underscore symbol "_" in Java programming. This series of articles called “Stranger things in Java.
In this video tutorial, we introduce factory design patterns and abstract factory design patterns with examples and key points.
In the video below, we take a closer look at the Observer Design Pattern in Java. The tutorial will provide an introduction, example, and key points. Let's get started.
Learn how to create Java queues that can sustain millions of events per second and that can hold terabytes of data. Queues are often fundamental components in software.
The dev.java website is a huge resource for all Java developers. Here are 11 tricks collected from the site. [Nicolai Parlog is a developer advocate at Oracle, and he recently created a highly caffeinated.
Java is one of the most-used programming languages for applications, including cybersecurity. In this post, learn why Java is important to secure web design.
The latest version of Oracle JDK 17 can be downloaded from a command line, or automatically in scripts and dockerfiles by using download URLs which will deliver the then current update release.
In low-latency applications, the creation of unnecessary objects is often avoided by reusing mutable objects to reduce memory pressure and thus the load.
Java serialization is a popular mechanism where you are able to serialize and deserialize complex object graphs, or example where object A can contain a reference.
An introduction to the lean REST framework that turns a number of popular Java libraries into a more streamlined alternative to Spring. Dropwizard is a REST-oriented framework that draws together several Java packages.
The JavaFX Media API approach is cross-platform and can be used on Windows, Linux, and macOS. It works well for JavaFX.
In the video below, we will take a closer look at Spring Boot - RESTful web service endpoint to delete user.
Java Development Kit (JDK) 18 is set for release on March 22, 2022. The new version of standard Java will have nine new features, with the feature set having been frozen as of December 9.
Oracle ships JDK 11 and JDK 17 as 64-bit binaries for Windows, macOS, and Linux. However, many Java applications, especially for Windows.
A group of developers and maintainers scrambled to secure the Log4j vulnerability over the weekend, but there is still a lot of work to do to clean up the mess.
In general, a Functor is a concept originating from mathematics, to be exact from a part of mathematics called category theory. In my very first article.
In this video tutorial, we will take a closer look at Spring Boot - RESTful web service.
The Simple Web Server was added to the jdk.httpserver module in JDK 18. It is a minimal HTTP static file server, designed to be used for prototyping. testing, and debugging. This article explores some less obvious.
The guide highlights the significant changes and enhancements done in JDK 17. This guide contains the following sections: Significant Changes in the JDK, Security Updates,Removed APIs.
General inheritance, whereby a public class is extended over package boundaries, provides a number of challenges and drawbacks and should be avoided.
Java is a high-level programming language, which means that we don't need to know the internals of the language and how it works under the hood to be a Java developer.However, if you want to lead back-end.
In the first article in this series, “Modern file input/output with Java Path API and Files helper methods,” you met Java’s Path API as well as an older API.
Deprecate finalization for removal in a future release. Finalization remains enabled by default for now, but can be disabled to facilitate early testing.
The JDK comes with a number of helpful utilities packed within the toolkit’s bin directory. For those who wish to decompile bytecode,Also known as the Java class file disassembler.
A few weeks ago I ran into this story on Reddit that discusses the problem with using the URL class as a key in a Map.
I have created the Tyracorn engine in Java pretty much from scratch, only using a small number of basic libraries. If you are considering doing the same then continue reading.
The release of the JDK 17 brings to interesting features in the Java language: sealed types and pattern matching for switch.
JDK 17 has been out for a few months and it’s not just packed with new language features. The performance boost compared to older JDK versions is also really significant.
In the video below, we take a closer look at How to run the Spring Boot application using the Maven Command?
Writing this blog is a result of how it took a while for me to figure out how to configure the OUT parameter in calling the stored procedures using Spring JPA.
I’m a developer who cares deeply about production. But I’m not a DevOps and unfortunately, I’m pretty bad at that. That’s why when I heard about Skaffold.
Likewise, to manage the risk of lock-in with the walled garden of a single Cloud vendor, one can eschew their specific services and choose Kubernetes. In both cases, and especially in the former.
Assumptions and ambiguities. As developers, we all hate them. Sealed classes—defined and implemented by JEP 409, as a standard language feature in Java 17.
Enhance the Java programming language with pattern matching for switch expressions and statements, along with extensions to the language of patterns.
In this article, I'll discuss how you can take a real-world REST application example adapted to spring-cloud-function and speed up the cold start time using GraalVM.
In this Spring Boot video tutorial, learn more about building RESTful web services with Jersey (XML) and JPA.
In this Spring Boot video tutorial, learn more about RESTful API with Spring Data REST
In this article, find answers about immutability and its best practices. Practical examples demonstrate the advantages of immutability and related tricks.
Take advantage of Docker to ease Java development. Learn how to update a running Java codebase (without restarting the container) and to debug into a remotely running containerized Java app.
The OpenAPI specification defines how to write HTTP APIs that can be consumed by any programming language and provide insight into the APIs’ functionality
You may be one of many organisations (or an engineer in one) that operates Java microservices in the cloud with a desire to move towards a serverless architecture, but are unable to justify the steep migration path
The Vector API provides a portable API for expressing vector mathematics computations. The first iteration of the API was proposed by JEP 338 and integrated into Java 16. The second incubator, JEP 414
Oracle Cloud Infrastructure (OCI) has recently launched the Ampere A1 Compute family of Arm Neoverse N1-based VMs and bare-metal instances. These A1 instances use Ampere Altra CPUs
JCS is a distributed caching system written in Java. It is intended to speed up applications by providing a means to manage cached data of various dynamic natures. Like any caching system, JCS is most useful for high read, low put applications.
MicroStream is a fundamentally new persistence framework for storing complex Java object graphs natively, which means the object graph is stored on disk as it is in RAM.
For the last few years, I’m writing articles that describe a new, more functional way to write Java code. But the question of why we should use this new coding style remains largely unanswered. This article is an attempt to fill this gap.
When it comes to managing your software development lifecycle (SDLC), one of the most challenging aspects is effectively managing and deploying data. Building “data-ready” test environments can effectively support your engineering practices
In Java, you can assign a char to an int, but you can’t assign a double to a float. And Java doesn’t stop you from performing a mathematical assignment or other operation that might lose precision.
The java.net.InetAddress API resolves host names to Internet Protocol (IP) addresses, and vice versa. The API currently uses the operating system's native resolver, which is typically configured to use a combination of a local hosts file and the Domain Name System (DNS).
To deploy enterprise Java applications with Red Hat JBoss Enterprise Application Platform (EAP) servers to Red Hat OpenShift, developers have usually needed to learn how to use OpenShift templates
Reimplement java.lang.reflect.Method, Constructor, and Field on top of java.lang.invoke method handles. Making method handles the underlying mechanism for reflection will reduce the maintenance and development cost of both the java.lang.reflect and java.lang.invoke APIs.
Records, introduced in Java 16 (JEP 395), address several key issues related to serialization. A source of frequent headaches in the Java ecosystem. Consequently this makes the serialization and deserialization process for Records much simpler and entirely defined by the public definition of the Record class.
An HTTP server can use content negotiation to respond to different clients. Modern clients typically expect a JSON response. At times, a different format is required, such as XML for older clients or binary for newer ones. The process used to manage that challenge.
In the video below, we take a closer look at the Spring Boot file upload example with MultipartFile | Spring Boot Tutorial. Let's get started! In this video article, take a closer look at the Spring Boot file upload example with MultipartFile.
One of the principles from the 12 Factor App, states that we have to separate our application configuration from the code. The configuration varies based on the environment and it's better to organize them based on the environment your application is running.
In the video in this article, we take a closer look at Spring boot and how to implement user sign-up with RESTful Web Services. Let's get started!Spring boot - How to Implement User Sign-up? | Spring Boot | Spring Security | RESTful Web Services.
java.lang.System.getProperty()’ is a common API used by Java developers to read the System properties that are configured during application startup time. i.e. when you pass “-DappName=buggyApp” as your application’s startup JVM argument, the value of the ‘appName’ system.
A new Java release every six months can be exciting, overwhelming, or both. Given that Java 17 is also an LTS release, it’s not just the developers but enterprises also noticing it. If you have been waiting to move on from Java 8 or 11, now is the time to weigh its advantages. In this blog post, I will limit the coverage of Java.
As a programmer, you should take challenges to survive and build some wonders in the development or programming field. Hence, if you are seeking to learn an advanced programming language to enhance your career skills, Java is one of the best prospects around. To develop skills, you should constantly improve.
Log4J2 is an upgrade to the popular Log4J logging framework. It is one of the newer frameworks and its goal is to provide improvements on Logback as well as Log4J. Also, it aims to avoid some of the issues in its older version. In this post, we will look at Spring Boot Log4J2 setup.
Many times, starting a container for that is not an option. For instance: you might not have a container environment available, or you just don’t have the artifacts to create that container (it might be a 3rd part API), or it is hard to emulate the needed behavior with containers.
When it comes to Test Automation, configuring parallel threads can become challenging especially when logins are involved. It's more of a challenge for the UI/ Selenium test to run batches in a separate thread on Azure.
In the video below, we take a closer look at Spring Boot on how to change the default context path using the Java command. In the era of high-profile data breaches, rampant ransomware, and a constantly shifting government regulatory environment.
Learn about Java Management Service (JMS), a new addition to the Oracle Java SE Subscription offering. JMS is a cloud service that helps you understand your Java usage on premises, on Oracle Cloud, and in other public clouds.
Software testing is an essential process for developing the perfect app. But, as a software tester, it is essential to have certain skills which in turn will help with testing the applications better. Many people and organizations still have a tough time finding the right software tester.
Today, everyone has access to the Internet. Mobile phones and high-speed internet connectivity has brought people the convenience to surf the internet at any time. In fact, if we talk about the present then desktops traffic is lower than mobile device traffic.
Automation testing is not always a smooth ride. There are cases where the tests would not work as expected, in which cases debugging the test code (or implementation) is the only way out! Debugging issues in tests become even more difficult if the test suite.
Ever since its inception in 2011, microservices is making huge waves, especially among organizations developing forward-thinking applications. A survey by Nginx shows that 36% of enterprises are currently using Microservices, while another 26% is doing research.
Building an application using the grails framework is quite easy. But, when building it the right way we need to follow the best practices. Some of the practices followed while building a grails application are listed below: Controller: the controller logic should be as simple as possible. Duplication of code should be avoided.
Grails Training - Developed and delivered by the folks who created and actively maintain the Grails framework!. In this guide you are going to create your first Grails application. You will learn about domain classes, controllers, services, GSPs, and unit & integration tests. This guide is aimed at developers who are new to Grails.
Similar to other topologies like DevSecOps, which emphasizes more on the “Sec,” or security matters, DevTestOps stresses the aspect of continuous testing and CI/CD in DevOps. At the same time, to uphold the culture of saying “no” to working in silos.
Stream’s distinct() method returns a stream consisting of the distinct elements according to Object.equals(Object) of this stream For ordered streams, the selection of distinct elements is stable For duplicated elements, the element appearing first in the encounter order.
I wonder when I get promoted — many novice programmers today wonder when they get their first job. As a rule, there is no clear answer to this question. In different companies, the developer’s career path and the skills required from junior
For more than five years, DC/OS has enabled some of the largest, most sophisticated enterprises in the world to achieve unparalleled levels of efficiency, reliability, and scalability from their IT infrastructure. But now it is time to pass the torch to a new generation of technology: the D2iQ Kubernetes Platform (DKP).
Sharat Chander - Director, Java Product Management Georges Saab - Vice-President Java Platform Group & Oracle Chair OpenJDK Governing Board Aurelio García-Ribeyro - Senior Director of Product Management Manish Gupta - Vice-President Global Marketing, Java & GraalVM Chad Arimura - Vice-President Java Developer Relations.
This Stream method is an intermediate operation which returns an IntStream consisting of the results of applying the given function to the elements of this stream Stream’s mapToInt() method is stateless which means it is non-interfering with other elements in the stream Where IntStream is a sequence of primitive int-valued.
A critical component for every business website is a high-quality user interface. A well-designed interface gives the users an intuitive and efficient experience, which positively affects their perception of the brand. There are multiple tools or layout grids that help define website.
Hello guys, if you want to learn about Hooks in React.js like useState, useSelector, useEffect, and useDispatch then you have come to the right place. In the past, I have shared the best React courses, websites, and books and in this article.
Stack Overflow for Teams, our core SaaS collaboration product, is helping thousands of companies around the world make the transition to remote work, address business continuity challenges, and undergo digital transformation.
Apache Tomcat is an open-source application server maintained by the Apache community. It is one of the most popular solutions for hosting Java applications due to its ease of use and lightweight yet versatile functionality.
Software is changing the world. QCon empowers software development by facilitating the spread of knowledge and innovation in the developer community. A practitioner-driven conference, QCon is designed for technical team leads, architects, engineering directors, and project managers who influence innovation in their teams.
We build a distributed CRM system. The system has a dedicated Spring Boot-based authentication /authorization service and a number of secure and insecure micro-services.
A stack is the part of the memory. The local automatic variable is created on this stack and method arguments are passed. When a process starts, it get a default stack size which is fixed for each process. In today's operating system, generally, the default stack size is 1 Mb, which is enough for most of the process.
In this video tutorial, explore RESTful Web Services with Spring Boot and take a closer look at reading HTTP POST Request Body using @RequestBody annotation.Join the DZone community and get the full member experience. Reading HTTP POST Request Body using @RequestBody.
Hello Java developer, if you are looking for an example of how to create RESTful web services using Restlet Framework in Java and Eclipse then you have come to the right place.
You can format JSON String in Java using Jackson API's pretty print feature. As you might have noticed in my previous JSON tutorials that the output of the programs is not properly formatted, which makes them hard to read.
You can convert a java.util.Date to java.sql.Timestamp value by using the getTime() method of Date class. This method returns the long millisecond value from Epoch (1st January 1970 midnight)
Since Set interface or HashSet class doesn't provide a get() method to retrieve elements, the only way to take out elements from a Set is to iterate over it by using the Iterator, or loop over Set using advanced for loop of Java.
In earlier programming tutorials, I have taught you how to print a pyramid pattern of stars and numbers in Java, and in this tutorial, you will learn the printing pyramid patterns of alphabets.
The instanceof operator in Java is used to check if an object belongs to a particular type or not at runtime. It's also a built-in keyword in Java programming language and is mostly used to avoid ClassCastException in Java.
Experience Quarkus on the Developer Sandbox for Red Hat OpenShift, and even if you don’t have access to a Red Hat OpenShift environment, that’s OK. We made it easy to provision an OpenShift cluster and experience the greatness of Quarkus.
Software Development goes through many phases like requirement gathering & analysis, communication, design, code building, testing, and release. A business has to ensure that the product they deliver is up to the mark.
Logging is an inevitable part of debugging. Well, at least in modern high-level programming languages and architectures. It wasn’t thirty years ago, in Assembly, but it is now. Sometimes we trace variables, but rarely.More often we just print them to console. Moreover, we don’t just print them using println.
MapStruct is sometimes a bit blunt regarding duplicate parameter names. Sometimes you don’t even notice a parameter name is duplicate (with nested objects for example). This can result in an incorrect mapping and can take a lot of debugging time.
When you’re writing a lot of data from your application or library to the graph, you want to be efficient. The following tips have been widely used in libraries for object-graph mapping, like Spring Data Neo4j or the PHP-OGM.
While working on Jakarta EE 10 certification (See announcement Apache Tomee Jakarta EE certified after 10 years, Apache TomEE implemented Jakarta Security specification. Currently, there is only one implementation used in Glassfish and used by all the other vendors
In distributed systems, it can be hard to figure out where problems are. You grep through one component's logs just to discover that the source of your problem is in another component. You search there only to discover that you need to enable debug logs
Prior to Kubernetes 1.22 release, once a StatefulSet Pod is in the Ready state it is considered Available to receive traffic. For some of the StatefulSet workloads, it may not be the case. For example, a workload like Prometheus with multiple instances of Alertmanager,
In this case study, we’ll look into a security problem that can totally wreak havoc to resources in an AWS account and uses an obscure functionality that most newcomers to the AWS ecosystem do not know about. There is a production Lambda function with a production S3 bucket
OpenJDK includes two interpreters, CPP interpreter and Template interpreter. The template interpreter is the default one, and its implementation contains various optimization to make it fast, which also makes its source code harder to follow to some extent.
I recently received an invite to try out the OpenAI API beta. As always, I jumped straight in and started playing around. By tweaking the examples I was able to produce some interesting and/or entertaining results. However, after a little while I realised I didn’t really understand what was happening or what the various parameters.
Kubernetes v1.22, released earlier this month, introduced a redesigned approach for volume populators. Originally implemented in v1.18, the API suffered from backwards compatibility issues. Kubernetes v1.22 includes a new API field called dataSourceRef that fixes these problems
IncludeClassNamePatterns specifies regular expressions that are used to match against fully qualified class names when running a test suite on the JUnit Platform. You can use @IncludeClassNamePatternsand @ExcludeClassNamePatterns to explicitly include and exclude the classes.
In this article, we will discuss how to remove/eliminate null & empty values from a Stream using filter() method A list contains numbers and null values We are trying to remove all null values from Stream using 3 different approaches
The Java programming language offers a seamless and elegant way to store and retrieve data. However, without proper input validation and safeguards in place, your application can be vulnerable to unsafe deserialisation vulnerabilities.
Quite often we see that the main operational storage is used in conjunction with some additional services, for example, for caching or full-text search.Another architecture approach using multiple databases is microservices
In the spirit of my last few articles, where we have looked into Template Literal Types and Types and Mocking, we are going to dissect another topic in typescript involving types. In this article, we are going to learn various ways you can narrow types.
Spring Integration is a very powerful and extensible framework for, well, integrations. But sometimes it’s not trivial how to get some information that yo need.In my case – a certificate used for mutual authentication
If you are new to JSP then your first question would be what are implicit objects in JSP? Well, implicit objects in JSP are Java object which is created by Servlet containers like the tomcat or Jetty during translation phase of JSP
Infrastructure as Java Code, AWS Cloud Development Kit, Java Server Faces vs. Web Components
#Java #OpenJDK #JDK This #JEPCafe discusses JEP 361, released in the JDK 14, i.e. Switch Expressions. Switch Expressions is one additional (great!) feature emerging from Project Amber, with more to come!
Although the cloud as we know it has been around since the mid-2000s, it’s still a trendy technology, with its adoption among businesses increasing every year. Gartner forecasts that in 2021 investments in public cloud
While the basic gameplay on Minecraft Bedrock and Java Edition is the same, players learn many differences after playing both versions. As both editions are coded using separate programming languages
In the previous articles, we have discussed about Spring MVC web application using both XML-based & @Controller annotation-based approach in detail. Now let’s explore by extending Spring MVC
this is very straight forward example and it can be counted using Collection API as well We can use count() method after filtering and removing duplicates which is illustrated in the further examples
In Java, you can call one constructor from another and it’s known as constructor chaining in Java.
"Learn to code" has been a refrain for entrepreneurs for more than a decade. Want to start a business in the high-growth universe of venture capital windfalls
Java needs no introduction. Almost every person worldwide acknowledges Java’s potential in web application development.
I was looking for a new language to learn and Go seemed a very good candidate. It is getting popular due to its simplicity and power. It is created by some of the best minds of our industry
A salesman must visit all the cities on a map exactly once, returning to the start city at the end of the journey. There is a direct connection from every city to every other city, and the salesman may visit the cities in any order. What is the shortest path for the salesman?
Not long ago, Java developers had to be very good at Java (of course), Java EE or Spring technologies, some front-end technologies such as JSF, Angular, React, SQL and databases. Some architecture and modeling knowledge was also great to have.
Many of us focus on how efficient we can be. Many of our organizations want to maximize our output for every minute and hour of work. However, if we focus on effectiveness first, we create better outcomes for everyone.
Everyone should monitor their production system to understand how the system is behaving. Monitors help you understand the workloads and ensure you get notifications when something fails—or is about to fail.
Because they’re simple to create and consume, REST has quickly become the de-facto standard for establishing web services on the internet. There’s a lot more to say about how REST fits into the world of microservices
JUnit5 is the next-generation test framework, a very common tool for developers to write unit test classes. This article will teach you how to use a new feature named Parameterized.
Garbage Collection is automatic on all modern platforms – Java, .NET, Golang, Python. So, do you have to worry about it? This article showcases and justifies the importance of Garbage Collection analysis
I am a big fan of design pattern articles and love to read articles on design patterns and recently wrote about decorator design pattern in Java, Observer pattern, static factory pattern and Singleton pattern.
In a previous post I had gone over how a “Try” type can be created in Kotlin from scratch to handle exceptions in a functional way. There is no need however to create such a type in Kotlin
In the previous entry to this series we explored dynamically configuring Envoy which is an important part of running Envoy in a cloud-native environment. In this entry
Flutter is a Dart-based toolkit that helps you build the front end of your apps. It really shines in cross-platform mobile app development and aims to be a viable option for web and desktop as well.
PATH is one of the fundamental Environment variables on shell or DOS but it’s commonly associated with Java mainly because if we try to run a java program that doesn't include Java executable.
Hello again, everyone! We continue to search for answers to questions for junior, mid-level and senior Java developers. The questions are super interesting.
To know what are the top technologies to learn as software developers is a crucial habit to develop. Otherwise, the technologies take the market by storm and the learning curve will take time.
To access the nth character of a string in C, we can use the square brackets  notation by passing the character index.
Trunk based development is an Extreme Programming source control technique in which developers collaborate to grow and maintain directly
OOP concepts are needed to solve a large problem by breaking it into smaller problems. Through solving small problems, it is possible to build a productive, complex program.
Along with the advantages of microservices, we also encounter a lot of challenges. One of these challenges is to have a reliable monitoring system for our apps
For relational, they have Amazon Aurora. It’s compatible with MySQL and PostgreSQL. It has 5x throughput compared to MySQL (on RDS) and 3x compared to PostgreSQL (on RDS). It can scale out to 15 read replicas
Containers have exploded in popularity in recent years. And as more developers are using these containers
I've seen a lot of confusion recently about the SpringExtension. When failing to get the context configuration for a test right
In this article, we are going to see what the SQL Seek Method or Keyset Pagination is and why you should consider it when navigating over large results sets. The goal of pagination
The dictionary meaning of advance is a forward movement or a development or improvement and the meaning of improve means thing that makes something better. All in all
In this tutorial, we're going to show how we can use different command-line interface (CLI) processes to consume a SOAP web service.
Clean code can be summarized as a code that any developer can read and change easily. Clean coding principles help us achieve a lot of desirable goals related to the software we intend to produce.
In the previous part of the tutorial, we took some time to refresh our knowledge regarding the foundational principles of the REST architectural style. The critical look at the state of the REST as interpreted.
In this tutorial, we will review the basics of Spring Cloud Config Server. We will setup a Config Server and then build a client application that consumes the configuration on startup and then refreshes the configuration without restarting.
Several years back, virtualization became a buzzword in the industry which flourished, evolved and became famously known as Cloud computing. It involved sharing computing resources on different platforms.
Writing JUnit tests for Java classes in Eclipse and Netbeans IDE is super easy, and I will show you that later in this JUnit tutorial. Before that, let’s revise what is a unit test and why should you write them.
Bounded and unbounded wildcards in Generics are two types of wildcards available on Java. Any Type can be bounded either upper or lower of the class hierarchy in Generics by using bounded wildcards.
java.library.path is a System property, which is used by Java programming language, mostly JVM, to search native libraries, required by a project. Similar to PATH and Classpath environment variable, java.library.path.
One of the frequently asked Spring MVC Interview questions is about explaining the flow of web requests i.e. how an HTTP request is processed from start to end. In other words, explaining the flow of requests.
Maximum heap size for 32 bit or 64 bit JVM looks easy to determine by looking at addressable memory space like 2^32 (4GB) for 32 bit JVM and 2^64 for 64 bit JVM. The confusion starts here because you can not really set.
Quarkus has set itself the goal of simplifying the development process and introduced Dev Services with version 1.13, which provide preconfigured development containers in development mode.
Suppose you have a ConcurrentHashMap of String and Integer and you want to print all keys and values, how do you do that? This is a common.
Oracle and Microsoft SQL Server are two of the most popular database but they are very different from each other and if you are migrating SQL queries or databases.
To teach myself Kubernetes in general and controllers in particular, I previously developed one in Java. This week, I decided to do the same in Rust by following the same steps I did.
The marker interface in Java interfaces with no field or methods or, in simple words empty interface in java is called a marker interface.
This is a guest post for the Computer Weekly Developer Network written by Adam Dossa in his role as chief technology officer at Polymath.
CodePoint method in String is used to get Unicode code point value at index or before the index. In String class we have a lot of utility methods for dealing with String like Split, replace.
In this post we will learn how we can use Kotlin extension functions to provide a simple and elegant type conversion mechanism Maybe you have used Apache Sling before. In this case, you are probably familiar with Slings usage of adapters.
Hybrid cloud options have evolved beyond the traditional definition, and have expanded to enable the functionality of cloud services to run.
The command prompt is still a powerful Windows tool. Here are the most useful CMD commands every Windows user needs to know.
Selection statements are a program control structure in Java. As the name suggests, they are used to select an execution path if a certain condition is met.
Java EE, now known as Jakarta EE, helps bridge old and new technologies - say a mix of older and cloud-native applications in a hybrid cloud environment.
Scanning your code base frequently to discover security risk early in development gives engineers more time time to address issues. But security risk is a challenging issue and most developers need more than just time.
Method overloading and overriding are the two ways in which Java demonstrates polymorphism. Polymorphism comes from a combination of two Greek words: "poly" meaning many and "morph" meaning form.
A full-stack Java developer is an IT professional who has in-depth knowledge and expertise in full-stack tools and Java frameworks.
Machine programming, which automates the development and maintenance of software, is becoming supercharged by AI.
Blockchain is one of the technologies that has gained immense traction in recent years and has now gone above and beyond cryptocurrency.
ZDNet has compiled a collection of the best Microsoft certifications that will protect your job and boost your income as we head toward 2022.
Today, job boards show loads of open DevOps engineer positions (and similar titles or roles). That means there will be many DevOps engineer interviews, and they come with considerations.
Experts share the IT job interview questions you will face in 2021 and advice on how to answer them. Hint: Recruiters and hiring managers say that remote work will be a hot topic.
A manager directs and motivates the team, as well as helps to understand the wishes and requirements of clients, and how to achieve set goals.
Even in 2020, there’s a good chance that you’re still working with at least one legacy system. If so, you’re probably thinking about whether to migrate to a microservices architecture.
Preparing for an artificial intelligence job interview can feel overwhelming, whether you are a fresher or not.
A Git fork is nothing more than a copy of an existing repository, along with a change to the name of the folder in which that repository resides.
As IT teams weigh what to containerize and migrate to a cloud environment, they need to evaluate many Java workloads. Experts explain three key factors
Operators are symbols used to perform operations on values, variables, or statements. The expressions on which they perform these actions are called operands.
From stock market analysis to economic forecasting, earthquake prediction, and industrial process and quality control, time series analysis has countless applications that enterprises.
Even if most of us can’t travel as we once did, the world is a more accessible place, at least online. Business people may not be attending international conferences.
Preparing for an RPA job interview, as a candidate or hiring manager? Check out these RPA-related questions and guidance on developing strong answers.
We can interview clearly and decisively. The key is to ask good questions with good follow-ups. We need to know what we’re looking for and how we’ll find it.
Are your hand shivering and pouring yourself with sweat right before your scrum master interview? Do you feel quite uncomfortable, maybe unprepared.
We’ve all used dozens of serialization frameworks – for JSON, XML, binary, and ORMs (which are effectively serialization frameworks for relational databases).
To set up Node.js on windows you will need to download the installer from this link. Click on the installer (also include the NPM package manager) for your platform and run the installer to start with the Node.js setup wizard.
In an earlier post about idempotency and safety of HTTP methods we learned that idempotency is a positive API feature.
Fontjoy helps designers choose the best font combinations. Mix and match different fonts for the perfect pairing.
Flutter has a rich pool of packages and widgets. You can achieve most things by either using the rich widget pool that Flutter offers or by using a package.
Our Flutter Tutorial provides basic and advanced concepts of the Flutter framework. Flutter is a UI toolkit for building fast, beautiful, natively compiled applications for mobile.
Our core Java programming tutorial is designed for students and working professionals. Java is an object-oriented, class-based, concurrent, secured and general-purpose.
Do you have what it takes to ace a Java Interview? We are here to help you in consolidating your knowledge and concepts in Java. The following article will cover all the popular Java interview questions.
Preparing for Java developer interviews? Here are.
Top Fintech Software Engineer Interview Questions
Conditional logic is most commonly implemented through the use of an if-then-else statement. However, when an RPA developer is faced with multi-branched.
In object-oriented programming, a constructor is a special function that you call to create an object. Constructors have several unique.
As many fans are aware, Minecraft version 1.17 was recently released. This highly anticipated update contained a myriad of new features, including new mobs, blocks, items, and achievements.
If you are a Java developer working on a Java JEE projects like a Java Web application running on Tomcat or Glassfish, or you want to get into that by learning server-side technologies.
Just-in-time (JIT) compilation is central to peak performance in modern virtual machines, but it comes with trade-offs.
The problem: If you use Exceptions in the wrong way, bugs will be very difficult to find. If you always use generic Exceptions.
In this video, I am going to quickly share with you 3 excellent GitHub repositories for java beginners and Java developers.
As I mentioned in Hashtag Jakarta EE #76, the Jakarta EE Platform project is in the process of determining the Java SE requirements for Jakarta EE 10. In this post, I try to shed some light on the implications.
Cookies are a piece of any information sent from the server and are stored in the client’s browser. This information helps to track the client’s action and the browser sent.
RESTful API stands for the standard web service interface used by the applications to communicate with each other. This API conforms to the REST architectural style and constraints.
Welcome to May’s updates on VS Code for Java. In this edition, we will share with you Java Formatter Settings editor and other cool features. Let’s start.
Multithreading questions are an essential part of Java interviews. If you are going for an interview with an investment bank like Citibank or Morgan.
This writeup describes a number of observations while performing an experiment to determine the feasibility of using JFR mirror events in core parts of the JDK, in particular, the Networking APIs..
Want to learn more about the potential causes and solutions to the StackOverFlowError in your JVM project? Check out this post to learn more.
Java Champions love pattern matching for instanceof, records, Stream.toList(), the vector API, the foreign linker API, and the foreign-memory access API.
Microservices architecture helps in building an application as a suite of multiple fine-grained smaller services. Each of these services run in its own process and are independently deployable.
Hello! In this tutorial, we will learn how to Sequelize ORM in Node.js Application. More specifically, we will build a RESTful application in a Node.js environment running on an Express.js.
I recently had two members of my team independently confuse themselves with a subtle point in the react-redux bindings. We have a few instances where a component includes callbacks and inside.
The Kubernetes ecosystem includes an ever-growing number of tools and services you can plug in: Let’s look at six useful tools for putting your Kubernetes.
The need to encapsulate the runtime is fundamentally caused by Java’s nature as an open programming environment.
Everyone makes mistakes, not just beginners, but even professionals. This article goes over a dozen common mistakes that Java newbies and newcomers make and how to avoid them.
GPUs have been widely used for accelerating deep learning, but not for data processing. As part of a major Spark initiative to better unify deep learning and data processing on Spark.
TensorFlow Serving is an easy-to-deploy, flexible and high performing serving system for machine learning models built for production environments. It allows easy deployment of algorithms and experiments.
Cameron Purdy is probably best known for Oracle Coherence (previously Tangosol), a coherent distributed in-memory cache and data grid.
We are excited to announce the Deep Java Library (DJL), an open source library to develop, train and run deep learning models in Java using intuitive, high-level APIs.
Within many development languages, there is a popular paradigm of using N-Dimensional arrays. They allow you to write numerical code that would otherwise require many levels.
Enterprise blockchain projects can easily run aground without the right navigational tools. Our in-depth guide will help ensure safe passage.
When configuring the test of a Spring Boot application, you may be used to using an application properties file e.g. application.yaml in src/test/resources with the same name as the main configuration.
For many years, Java EE has been a major platform for mission-critical enterprise applications. In order to accelerate business application development for a cloud-native world.
The NYJavaSIG had an exceptional event on June 9th. They had the lightning talks with aspiring speakers from the tri-state area (Elena Felder, Janeice DelVecchio, Erik Kariyev, Mike Redlich, and Hui Min Wu).
In a microservices architecture, an application is formed by several interconnected services where all of them work together to produce the required business functionality.
Struggling to keep up with technology, or feeling overwhelmed with so many things to learn? Do you feel you are a competent developer, but you don't see the results in your career.
Following the lingering promise of managed infrastructure, reduced operational cost, and resiliency, cloud computing has seen phenomenal trends in adoption since the past decade.
Java just celebrated its 25th anniversary at the beginning of 2021 and it's still going strong. According to Stack Overflow, it's still one of the most-used programming languages.
This article covers a multitude of areas on real project data, including time-consuming data, optimization, and integration. Read below for a full tutorial!.
For API users it is quite important an API provides useful error messages. Otherwise, it can be hard to figure out why things do not work.
Hello guys, if you are an application Programming and looking for the best backend frameworks to learn in 2021 then you have come to the right place. Earlier.
Technology is constantly evolving, and to beat the competition, the teams must push the software updates to the production environment as quickly as possible.
These days, there is a lot of excitement around 12-factor apps, microservices, and service mesh, but not so much around cloud-native data.
GraalVM Native Image can be a compelling platform for your Java cloud applications.
Kubernetes is cool, but not for the reasons you think. For a time people glommed onto Kubernetes because it promised to be a great new cloud technology.
According to the 2020 Java InfoQ Trends Report, Quarkus has grown in popularity, moving quickly into the Early Adopters space.
Not being able to use your preferred controls in games may be quite distracting. A lot of gamers are used to playing Minecraft with a controller.
This article series will explore the state-of-the-art in building microservice-based architectures using the Java language.
Your choice of platform is the result of your preference in flexibility, where more flexibility usually implies more preparatory work.
If you are a Java Expert then this is for you. Let us know if you looking for a job change? Then do not worry, we’ve a right answer for your job interview preparation.
Microservices are a popular way to create enterprise systems that run at web scale. But the high cost of a microservices architecture.
Java in 2020 is overgrown with new features and was released twice right on schedule, despite the global turmoil.
Learning Java on your own doesn’t have to be difficult; there are plenty of resources for independent study and practice.
While some developers may find the complex algorithms and processes intimidating, these frameworks, libraries and languages.
With this new approach, existing applications can expect performance improvements in case.
Johan Janssen describes the six-months release process of Java and why applications should use a recent version, the challenges of upgrading.
When you hear about Java, the first thing that most probably crops up in your mind is that it's the oldest programming language.
Now that we have explored microservices development in 2021, it's time to dive into the most popular Java technologies.
Oracle recently released version 15 of the Java programming language and virtual machine. In the new OpenJDK release cadence.
A foreign function and memory API, a new rendering pipeline for MacOS, and a uniform API for pseudo random number generators are planned for the Java long-term support release due in September.
Quarkus and Jakarta EE are gaining on Spring/Spring Boot as the most popular approach to moving Java applications to the cloud.
The open source Spring framework and Spring Boot, both created by Rod Johnson, are far and away the most popular tools for enterprise Java developers, according to a just-released independent.
James Ward and Joshua Suereth explain the evolutions happening in many OOP languages today.
On the 16th of March 2021, Oracle started offering open-source Java 16 (Java SE 16) and Java 16 Development Kit (JDK 16) to all developers and enterprises.
Kotlin is popular among developers—in fact, it's the fourth "most loved" programming language, according to a 2020 Stack Overflow survey.
Cloud-native solutions are not a novelty thing. Writing, deploying, and managing applications outside of local machines opens countless opportunities.
If you have programmed for a little while in Java, it is likely that you have come across generics, and you have probably used them.
Guava is an omnibus open source Java library created by Google for its internal needs. Within this library, you’ll find a treasure chest of functionality.
The cloud often blurs traditional distinctions between infrastructure operations and application development. It is becoming more and more.
Enumerations—or “enums” for short—are a restricted Java data type that lets a developer define a variable to be a set of predefined constants. The variable can be a member of only that set of constants.
The Java platform is one of the most widely used software development platforms in the IT industry. It is beloved equally by individuals and organizations.
Latest Report Available at Advance Market Analytics, “Java Web Frameworks Software Market” provides pin-point analysis for changing competitive dynamics.
Besides having engineering chops and certifications, aspiring cloud professionals should have curiosity and soft skills to succeed in the evolving cloud computing landscape.
The recent results from the 9th annual global developer productivity report gives us insights to the current state of Java in 2021. Over 850 Java developers responded.
Speed is the key to modern software development. The monolithic all-or-nothing paradigm of traditional waterfall software development.
Today we are pleased to announce the availability of Tribuo, an open source Java Machine Learning (ML) library.
Functional interfaces are introduced as part of Java 8. It is implemented using the annotation called @FunctionalInterface. It ensures that the interface should have only one abstract method.
A code is called a thread safe when a thread is modifying or reading shared data, no other thread can access it in a way that changes the data.
Java was originally a programming language invented by Sun Microsystems (Sun was acquired by Oracle in January 2010). Since Java's invention it has become more than just a language. It is also a platform with a set of standard APIs and standard tools. Just exactly what Java has evolved
This Java tutorial trail (set of articles) describes the Java programming language. The intention of this tutorial is mostly to be a compressed introduction to Java for developers who already know a bit about programming and object oriented concepts.
Recently i worked on a java microservice which was reading records from a csv file and inserting or updating into database through sql procedure.
A Stream represents a sequence of elements supporting sequential and parallel aggregate operations. Stream does not store data, it operates on source data structures such as List, Collection, Array etc.
Lambda expression is a representation of anonymous function which can be passed around. Lambda expression does not have name but it has parameters, body and return type.
Eclipse Memory Analyzer Tool (MAT) is by far the best tool to analyze Java Heap Dumps. A heap dump is a snapshot of the heap memory of a Java process at a given time.
Java VisualVM presents data for local and remote applications in a tab specific for that application. You can have multiple application tabs open. Each application tab contains sub-tabs that display different types of information about the application.
In this article we will know about Java interface private methods, that are introduced in Java 9 version and also know about Rules for writing private methods in Interface with examples.
If you are looking to learn Java, you may be wondering where to start. Which technologies should you focus on? Whether you are new to the language, a middle-level learner, or already using Java at work
Java is quite a well-known coding language and also one of the easiest to learn. If you are an aspiring developer, you want to create applications, or a computer nerd who wants to learn to code for research
Here is my list of things a Java developer should learn in 2021, there is a good chance that you already know most of them but learning them better and doing deep dive doesn't hurt:
In this article we will try to understand the Java memory model and how garbage collection works. In this article I have used JDK8 Oracle Hot Spot 64 bit JVM. First let me depict the different memory.
All the objects which are created dynamically (using new in C++ and Java) are allocated memory in the heap. If we go on creating objects we might get Out Of Memory error, since it is not possible.
Oracle’s Java Growth Package (JDK) 16 is now out there as a manufacturing launch, as of March 16. The brand new options in JDK 16 vary from a second preview of sealed lessons to data to concurrent thread-stack processing for rubbish assortment.
Java collections refer to a collection of individual objects that are represented as a single unit. You can perform all operations such as searching, sorting, insertion, manipulation, deletion, etc.
In the age of Servlets and JSPs, Java’s main function took a backseat to these technologies that were initialized with a call to their init() method, and invoked through calls to their doGet() or doPost() methods.
This article series will explore the state-of-the-art in building microservice-based architectures using the Java language. Alongside popular stalwarts, such as Spring Boot and Dropwizard.
The OpenJDK community has proposed JEP-413 as a way to add compilable source snippets to API documentation. This approach will simplify the role of maintainers who work on their examples.
Functional programming means using functions to the best effect for creating clean and maintainable software. This article illustrates the concepts behind the functional paradigm.
The software industry is one such environment where evolution is a common thing. A new innovative program can outperform any program that was useful before. For this reason.
In this post, we highlight the shortcomings of relying on stack traces alone for investigating Java NullPointerExceptions.
Alright, I'm not looking for an EXACT solution (Unless you seriously want to give the time to help me out that much) I'm just looking for where I should start and maybe a really nice detailed algorithm.
QCon Plus is a virtual conference for senior software engineers and architects that covers the trends, best practices, and solutions leveraged.
Folklore has it that when a decidedly uncreative software engineer on Sun’s programming team was asked to come up with a name, they saw a tall tree outside their office window and submitted ‘Oak.’