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Heap memory - This is a special memory area where java objects are stored. Stack memory - Temporary memory area to store variables when method invoked.
Some, if not most, of our judgments regarding technology stacks come either from third-party opinions or previous experiences. Yet, we seem to be adamant about them. For a long time (and sometimes even now), I've seen posts that detailed how Spring is bad because it uses XML for its configuration. Unfortunately, they blissfully ignore the fact that...
For decades, Java has been able to invoke native programs on an operating system. JNI (Java Native Interface) and JNA (Java Native API) are commonly used to invoke native programs (Java Native Access). In recent years, Java has gained the ability to run JVM apps natively. In other words, the JVM apps are binary executables with no dependency on the...
JAVA_TOOL_OPTIONS Imagine a scenario where you need to change a JVM parameter, but you cant or is not a good solution to changing the start script of your server(s). One of the challenges we had, when we were working with containers, was a way to change a parameter to a JVM without building the docker image again.The application at the start time s...
In this video tutorial, we take a closer look at how to enable HTTPS in a Spring Boot application. Let's get started!
The closer your test or demo data is to the real world the better you can test the application for UX, improve, and catch corner cases during development. In this article, I'll show you how to use Vaadin's example data generator to create demo data for a simple SQL database. The article shows how to build a complete app combining Spring Boot, JPA, ...
The tools available in the Spring ecosystem make it easy to get started with building applications. However, the same is true for Quarkus, which has many additional features and capabilities aimed at improving the developer experience. A Spring developer can quickly get started working with a Quarkus project and immediately become more productive, ...
In my latest blog post, I advised reassessing one's opinion now and then as the IT world changes fast. What was true a couple of years ago could be dead wrong nowadays, and you probably don't want to base your decisions on outdated data. This week, I'd like to follow my advice. One of which was advocating for TestNG vs. JUnit. In the post, I mentio...
Seven ways to write the same code snippet Here are eight ways to write the exactly same code. Some are easier to read than others and all are a variation of a code I've seen in a real code base. My personal favorite is #7, what's yours? #1 One liner Kotlin DAO.filter { it.name == "foo" }.map { it.company }.toSet()...
Overview Apache Tika is a library that allows you to extract data from PDF, XLS, PDT, etc. Apache Tika using a decorator pattern so you can easily fit it to your needs. Adding Dependency XML org.apache.tika tika-core 1.26 " data-lang="application/xml"> <dependency> <groupId>org.apache.tika<...
In the video below, we take a closer look at Spring Boot @ConfigurationProperties example | Spring Boot tutorial. Let's get started!
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. However, if you run the projects based on Jakarta EE 8 (or higher), you may be interested to use the TomEE server with built-...
It seems that everything is available through applications, which are integrated into our daily lives. In any case, having ones own apps in JavaScript benefits businesses by increasing sales and providing users with the most straightforward way to interact with their company. The application is currently occupying a prominent position in our lives....
The Java programming language is very popular and, truth be told, if it disappeared tomorrow, there would be millions of websites and apps that would no longer function. Java is recognized for its performance, security, and dependability and those are just a few of the things that make Java a frequent developer choice. So, whats so great about Jav...
In the video below, we explore RESTful Web Services with Spring Boot and take a closer look at reading HTTP POST Request Body using @RequestBody annotation. Let's get started!
You have probably heard of the cloud-native approach such as cloud-native platform, architecture, and application since the Cloud Native Computing Foundation (CNCF) defined the term back in 2015. Or even three years earlier than the CNCF definition. I mean the term cloud-native was first used by Bill Wilders book, Cloud Architecture Patterns, which...
Slides The 15 biggest data breaches of the 21st century How much does a data breach cost? New research shows 75% of open Redis servers infected Layered security approach (is only as good as .) Key that could have saved the Titanic goes up for auction DevSecOps: A leaders guide to producing secure software without compromising flow, feedback a...
Spring Security OAuth server becomes deprecated. However, its replacement is still in development. So, I think it is worthwhile to inspect how the current OAuth server works under the hood. Firstly, this knowledge helps us to quickly figure out how the new server implements the same functionality. Secondly, it will be interesting to compare and con...
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. We choose the JWT security mechanism for the authorization server not to verify any request for every secure micro-service; it is the micro-services job to do this. Also, we want to...
In the video below, we take a closer look at what a comparator is. We'll also discuss comparable interfaces, hashing, and hashcodes. Let's get started!
Abstract The AWS Lambda is a popular platform for serverless development, and as a Java developer, I like to be able to use this platform, but there are some essential points that need to be addressed first. The cost of serverless functions on AWS Lambda would be expensive with the JVM. The Cold start on AWS Lambda can be a real issue on the...
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. What you are reading is one in a series of articles titled Going beyond Java 8, inspired by the contents of my book Java for Aliens. These articles will guide the reader step by step to ex...
I am slightly hesitant to write this post, as it might attract some criticism. Nevertheless, I told myself there is nothing wrong with sharing my point of view (even though it might not be well accepted). I would like to share my personal experience regarding yesterdays Monolithic and todays Microservice architecture in this post. Yesterdays Monoli...
Java Exception Java Exception is a class created to handle abnormal application behavior. In this article, I'll explain how to use the Java Exception class and how to create your exception structure considering the existing Java Exceptions design. Java exception notion is one of the critical milestones in java and every developer must know it. ...
In the video below, we take a closer look at displaying a custom Error Page and walk through customizing a Whitelabel Error Page. Let's get started!
In the video below, we take a closer look at Spring Boot on how to schedule a task at a fixed rate? | Spring Boot - Schedule task. Let's get started!
We know that, in a software project, nothing replaces good documentation. However, it is also necessary to pay attention to how intuitive the written code is. After all, the simpler and more natural the code is, the better its experience for users. In the simple "programming rule", in which we will forget everything we have to remember, an API that...
In the video below, we take a closer look at Spring Boot with Spring Data JPA [Book], as well as a Spring Boot CRUD example with RESTful APIs and JPA. Let's get started!
In this video tutorial, we take a closer look at how to change the default port number of the Spring Boot Application using the application.yml file. Let's get started!
In the Spring Boot video tutorial below, we take a closer look at how to schedule a task at a fixed rate. Let's get started!
In the video below, we take a closer look at java.util.Collections class - Sorting or Ascending and Descending Order Examples | Java Collections Framework. Let's get started!
July is one of my favorite months. It starts off with a national celebration, always has nice weather, and my birthday is smack dab in the middle of it. I have a habit of taking summer vacation for the month and this year was no exception. We kicked things off with a journey to Chelan, Washington for the 4th of July. My sister-in-law, Mya, helps ru...
Introduction James Gosling, often referred to as "Dr. Java", is a Canadian computer scientist, best known as the father of the Java programming language. He did the original design of Java and implemented its original compiler and virtual machine. Our DevRel, Grigory Petrov, had the opportunity to interview James, and we have included the entire tr...
MongoDB is an open-source database that uses a document-oriented data model and a non-structured query language. It is one of the most powerful NoSQL databases around today. In comparison to traditional SQL databases, MongoDB does not use the usual rows and columns to model its data; instead, it uses a BSON (Binary JSON) format to save the data (do...
A thread dump is a snapshot of all the threads running in a Java process. Its a vital artifact to troubleshoot various production problems such as CPU spikes, unresponsiveness in the application, poor response time, hung threads, high memory consumption. Thus to facilitate troubleshooting, we have seen enterprises capture thread dumps on a periodic...
You might have seen this question being asked in so many interviews. We are going to achieve this using Java 8 completable future and executor service.
Introduction This guide explains how to do the following: Package a Maven-based Spring Boot application as a WAR file. Deploy a WAR file to Apache Tomcat. Deploy a WAR file to Eclipse Jetty. Packaging a Maven-Based Spring Boot Application as a WAR File To change the packaging in a Maven-based Spring Boot application that was generated using th...
Advanced portable applications accomplish a great deal. They convey information between various back-ends through network APIs. They store and recover information from the local database, process substantial amounts of media, and communicate with web sockets. It's difficult to monitor all the data from various asynchronous data sources, particularl...
Soft Deletion is a commonly used pattern in enterprise applications. Hibernate is a widely used persistence framework in the Java ecosystem. Therefore, it is not surprising that Hibernate provides a way to implement soft deletion. However, this approach has some awkward aspects, which are not highlighted by the docs and articles on that matter. In ...
In the video below, we take a closer look at how to enable HTTPS in a Spring Boot application | Spring Boot - Enabling HTTPS. Let's get started!
With persistence or network transmission, we need a serialization framework. XML and JSON are readable, but not so effective. Protobuf/thrift/avro has good performance, but there is a need to write IDL and import a heavy library.
As interest grows in microservices and containers, Java developers have struggled to make applications smaller and faster to meet todays demands and requirements. In the modern computing environment, applications must respond to requests quickly and efficiently, be suitable for running in volatile environments such as virtual machines or containers...
In the video below, we take a closer look at Java Deque and Iterator with sample programs. Let's get started with this video tutorial as we look into the Java Collections Framework and learn more about Deque in Java!
Project Creation We can use Spring Initializer to create the example application with the dependencies below: After that selection, please push the Generate button and save the project as a zip file.
Introduction Hibernate is the most popular ORM framework used to interact with databases in java. In this article, we will explore the various ways of using bulk selection and updation and the most effective way when using hibernate framework in Java. I experimented with three ways, which are as follows:
In the video below, we take a closer look at Java TreeSet ascending and descending order sample programs. Let's get started with this tutorial of TreeSet in Java!
In my last recent articles https://dzone.com/articles/openapi-3-documentation-with-spring-boot and https://dzone.com/articles/doing-more-with-springdoc-openapi we tried out a Spring Boot Open API 3-enabled REST project and explored some of its capabilities namely: Automatic JSR-303 related swagger documentation How maven builds properties co...
For the last two years, I experienced the Uber service while traveling from the Las Vegas airport to my sister-in-laws beautiful estate in the outlying suburbs. In every case, the Uber rides were purchased for mea nice gesture from my brother-in-law. As a result, I was able to focus on the opportunity to meet someone new while we crossed the rocky ...
There are two hard things in programming and naming is one them. If you don't believe me ask Martin Fowler https://www.martinfowler.com/bliki/TwoHardThings.html.In this post I'll be covering some general conventions for naming things to improve readability and understandabilty of the code.There are lots of things that need a name in programming. St...
In the video tutorial below, we take a closer look at Java TreeSet and Iterator with Sample Programs. Let's get started on this walkthrough Java Collections Framework/TreeSet in Java.
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