Clik here to view.
Using Maven Behind a Proxy
1. Introduction In this tutorial, we're going configure Maven to work behind a proxy – a common situation in environments where we don't connect directly to the internet. In our example, our proxy is...
View ArticleClik here to view.
Maximum Subarray Problem
1. Overview The maximum subarray problem is a task to find the series of contiguous elements with the maximum sum in any given array. For instance, in the below array, the highlighted subarray has the...
View ArticleClik here to view.
How to Print a Binary Tree Diagram
1. Introduction Printing is a very common visualization technique for data structures. It can be tricky when it comes to trees, though, due to their hierarchical nature. In this tutorial, we'll learn...
View ArticleClik here to view.
How to Merge Two Sorted Arrays
1. Introduction In this tutorial, we're going to learn how to merge two sorted arrays into a single sorted array. 2. Problem Let's understand the problem. We have two sorted arrays and we would like to...
View ArticleClik here to view.
An Introduction to Podman
1. Introduction In this tutorial, we'll look at Podman (short for “Pod Manager”), its features and usage. 2. Podman Podman is an open-source container management tool for developing, managing and...
View ArticleClik here to view.
Wrapping vs Rethrowing Exceptions in Java
1. Overview The throw keyword in Java is used to explicitly throw either a custom-made exception or in-built exception. But sometimes in the catch block, we need to throw the same exception again. This...
View ArticleClik here to view.
Guide to the AuthenticationManagerResolver in Spring Security
1. Introduction In this tutorial, we introduce AuthenticationManagerResolver and then show how to use it for Basic and OAuth2 authentication flows. 2. What is the AuthenticationManager? Simply put, the...
View ArticleClik here to view.
AWS S3 with Java – Reactive Support
1. Introduction AWS offers many services through its many APIs which we can access from Java using their official SDK. Until recently though, this SDK didn’t offer support for reactive operations and...
View ArticleClik here to view.
A Quick Guide to Post Requests with OkHttp
1. Introduction We cover the basics of the OkHttp client in our Guide to OkHttp. In this short tutorial, we'll look specifically at different types of POST requests for version 3.x of the client. 2....
View ArticleClik here to view.
Java Weekly, Issue 312
1. Spring and Java >> The Future of Spring Cloud's Hystrix Project [infoq.com] A good overview of Resilience4j — the heir-apparent to Netflix Hystrix, which is in maintenance mode. >>...
View ArticleClik here to view.
Guide to WebRTC
1. Overview When two browsers need to communicate, they typically need a server in between to coordinate the communication, passing messages between them. But having a server in the middle results in a...
View ArticleClik here to view.
Deny Access on Missing @PreAuthorize to Spring Controller Methods
1. Introduction In our tutorial on Spring method security, we saw how we can use the @PreAuthorize and @PostAuthorize annotations. In this tutorial, we'll see how to deny access to methods that lack...
View ArticleClik here to view.
Pre-compile Regex Patterns Into Pattern Objects
1. Overview In this tutorial, we'll see the benefits of pre-compile a regex pattern and the new methods introduced in Java 8 and 11. This will not be a regex how-to, but we have an excellent Guide To...
View ArticleClik here to view.
Get Substring from String in Java
1. Overview In this quick tutorial, we'll focus on the substring functionality of Strings in Java. We'll mostly use the methods from the String class and few from Apache Commons' StringUtils class. In...
View ArticleClik here to view.
Java Scanner
1. Overview In this quick tutorial, we'll illustrate how to use the Java Scanner class – to read input, find and skip patterns with different delimiters. 2. Scan a File First – let's see how to read a...
View ArticleClik here to view.
Quick Guide to Java Stack
1. Overview In this quick article, we'll introduce the java.util.Stack class and start looking at how we can make use of it. The Stack is a generic data structure that represents a LIFO (last in, first...
View ArticleClik here to view.
Introduction to Ninja Framework
1. Overview Nowadays, there are many JEE based frameworks like Spring, Play, and Grails available for web application development. We may have our reasons to choose one of them over the others....
View ArticleClik here to view.
Median of Stream of Integers using Heap
1. Overview In this tutorial, we'll learn how to compute the median of a stream of integers. We'll proceed by stating the problem with examples, then analyze the problem, and finally implement several...
View ArticleClik here to view.
How to Set the JVM Time Zone
1. Overview The users of our applications can be demanding when it comes to timestamps. They expect our applications to detect their time zones automatically, and display timestamps in the correct time...
View ArticleClik here to view.
Using the Not Operator in If Conditions in Java
1. Introduction In Java's if-else statements we can take a certain action when an expression is true, and an alternative when it is false. In this tutorial, we'll learn about how to reverse the logic...
View Article