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Knapsack Problem Implementation in Java 1. Introduction The knapsack problem is a combinatorial optimization problem that has many applications. In this tutorial, we’ll solve this problem in Java. 2. The Knapsack Problem In the knapsack problem, we have a set of items. Each item has a weight and a worth… Continue Reading java-knapsack
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Investing in “REST With Spring” – Bullet-Points Investing in the course – the bullet-points Quick – Learning as Needed + A developer can’t usually take a week off – to go through a course + A main goal of the material is to not have to go through everything right… Continue Reading rws-why
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Intro to the Java SecurityManager 1. Overview In this tutorial, we’ll have a look into Java’s built-in security infrastructure, which is disabled by default. Specifically, we’ll examine its main components, extension points, and configurations. 2. SecurityManager in Action It might be a surprise, but default SecurityManager settings disallow many standard operations:… Continue Reading java-security-manager
Design Patterns Series Creational Patterns + /bootstraping-a-web-application-with-spring-and-java-based-configurationIntroduction to Creational Design Patterns + /building-a-restful-web-service-with-spring-and-java-based-configuration/java-builder-pattern-freebuilderAutomatic Generation of the Builder Pattern with FreeBuilder + /securing-a-restful-web-service-with-spring-securityUsing the @Singular Annotation with Lombok Builders + /basic-and-digest-authentication-for-a-rest-api-with-spring-securityLombok Builder with Custom Setter + /rest-api-pagination-in-springLombok @Builder with Inheritance + /exception-handling-for-rest-with-springCreational Design Patterns in Kotlin: Builder + /entity-to-and-from-dto-for-a-java-spring-application/lombok-builder/java-abstract-factory-patternUsing Lombok’s @Builder… Continue Reading design-patterns-series
Integrating Spring with AWS Kinesis 1. Introduction Kinesis is a tool for collecting, processing, and analyzing data streams in real-time, developed at Amazon. One of its main advantages is that it helps with the development of event-driven applications. In this tutorial, we’ll explore a few libraries that enable our Spring… Continue Reading spring-aws-kinesis
The Spring TestExecutionListener 1. Overview Typically, we use the JUnit annotations like @BeforeEach, @AfterEach, @BeforeAll, and @AfterAll, to orchestrate tests’ lifecycle, but sometimes that’s not enough — especially when we’re working with the Spring framework. This is where Spring TestExecutionListener comes in handy. In this tutorial, we’ll see what the… Continue Reading spring-testexecutionlistener
Skipping Weekends While Adding Days to LocalDate in Java 8 1. Overview In this tutorial, we will briefly look at the algorithm to skip weekends while adding days to a LocalDate instance in Java 8. We’ll also go through the algorithm to subtract days from LocalDate object whilst skipping weekends.… Continue Reading java-localdate-add-days-skip-weekends
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Grouping Javax Validation Constraints 1. Introduction In our Java Bean Validation Basics tutorial, we saw the usage of various built-in javax.validation constraints. In this tutorial, we’ll see how to group javax.validation constraints. 2. Use Case There are many scenarios where we need to apply constraints on a certain set of… Continue Reading javax-validation-groups
The Bridge Pattern in Java 1. Overview The official definition for Bridge design pattern introduced by Gang of Four (GoF) is to decouple an abstraction from its implementation so that the two can vary independently. This means to create a bridge interface that uses OOP principles to separate out responsibilities… Continue Reading java-bridge-pattern
Spring Security – Attacking OAuth 1. Introduction OAuth is the industry standard framework for delegated authorization. A lot of thought and care has gone into creating the various flows that make up the standard. Even then, it’s not without vulnerability. In this series of articles, we’ll discuss attacks against OAuth… Continue Reading spring-security-oauth-attack-redirect