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A Guide to the Folding Technique in Java 1. Introduction In this tutorial, we consider hashing techniques used in various data structures that provide constant time access to their elements. We discuss in more detail the so-called folding technique and give a short introduction to mid-square and binning techniques. 2.… Continue Reading folding-hashing-technique
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Purging Expired Tokens Generated By The Registration 1. Overview In this tutorial – we’re continuing the ongoing Registration with Spring Security series to setup a scheduled task to purge expired VerificationTokens. During the registration process a VerificationToken is persisted. In this article we will show how to remove these entities.… Continue Reading registration-token-cleanup
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Spring Boot Exit Codes 1. Overview Every application returns an exit code on exit; this code can be any integer value including negative values. In this quick tutorial, we’re going to find out how we can return exit codes from a Spring Boot application. 2. Spring Boot and Exit Codes… Continue Reading spring-boot-exit-codes
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Introduction to Drools 1. Overview Drools is a Business Rule Management System (BRMS) solution. It provides a rule engine which processes facts and produces output as a result of rules and facts processing. Centralization of business logic makes it possible to introduce changes fast and cheap. It also bridges the… Continue Reading drools
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WebAppConfiguration in Spring Tests 1. Overview In this article, we’ll explore the @WebAppConfiguration annotation in Spring, why we need it in our integration tests and also how can we configure it so that these tests actually bootstrap a WebApplicationContext. 2. @WebAppConfiguration Simply put, this is a class-level annotation used to… Continue Reading spring-webappconfiguration
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Practical Java Examples of the Big O Notation 1. Overview In this tutorial, we’ll talk about what Big O Notation means. We’ll go through a few examples to investigate its effect on the running time of your code. 2. The Intuition of Big O Notation We often hear the performance… Continue Reading java-algorithm-complexity
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Mesos vs. Kubernetes 1. Overview In this tutorial, we’ll understand the basic need for a container orchestration system. We’ll evaluate the desired characteristic of such a system. From that, we’ll try to compare two of the most popular container orchestration systems in use today, Apache Mesos and Kubernetes. 2. Container… Continue Reading mesos-kubernetes-comparison
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Introduction to RSocket 1. Introduction In this tutorial, we’ll take a first look at RSocket and how it enables client-server communication. 2. What is RSocket? RSocket is a binary, point-to-point communication protocol intended for use in distributed applications. In that sense, it provides an alternative to other protocols like HTTP.… Continue Reading rsocket
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Java Weekly, Issue 244 Here we go… 1. Spring and Java ===== >> Optimistic locking in JPA/Hibernate [blog.arnoldgalovics.com] A good review of lost update anomalies and how to detect them using versioned and non-versioned optimistic database locks. >> Bootiful GCP: Relational Data Access with Spring Cloud GCP (2/8) [spring.io] In this installment… Continue Reading java-weekly-244
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SQL Injection and How to Prevent It? 1. Introduction Despite being one of the best-known vulnerabilities, SQL Injection continues to rank on the top spot of the infamous OWASP Top 10’s list – now part of the more general Injection class. In this tutorial, we’ll explore common coding mistakes in Java that… Continue Reading sql-injection
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