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Getting Started With Cassandra: Using CQL API and CQLSH

Getting Started With Cassandra: Using CQL API and CQLSH Icon
In this first part, I will cover how the Cassandra data model is laid out in brief and perform basic operations using CQLSH. For this tutorial series, I am assuming that readers would be able to install Cassandra by themselves on their respective machines depending on the operating system.
 
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Strategy Design Pattern

Strategy Design Pattern Icon
In this article, we’ll look at how we can implement the strategy design pattern in Java 8. First, we’ll give an overview of the pattern, and explain how it’s been traditionally implemented in older versions of Java. Next, we’ll try out the pattern again, only this time with Java 8 lambdas, reducing the verbosity of our code.
 

Guide to WeakHashMap

Guide to WeakHashMap Icon
In this article, we will be looking at a WeakHashMap from the java.util package. We will see how that construct is useful when implementing a cache. The WeakHashMap is a hashtable-based implementation of the Map interface, with keys that are of a WeakReference type. An entry in a WeakHashMap will automatically be removed when its key is no longer in ordinary use, meaning that there is no single Reference that point to that key.
 

Avoiding the ConcurrentModificationException

Avoiding the ConcurrentModificationException Icon
In this article, we’ll take a look at the ConcurrentModificationException class. First, we’ll give an explanation how it works, and then prove it by using a test for triggering it. Finally, we’ll try out some workarounds by using practical examples.
 

Hibernate One to Many Annotation Tutorial

Hibernate One to Many Annotation Tutorial Icon
This quick Hibernate tutorial will take you through an example of one-to-many mapping using JPA annotations – an alternative to the XML descriptor approach. In simple terms, one-to-many mapping means that one row in a table is mapped to multiple rows in another table.
 

Guide to Java 8 groupingBy Collector

Guide to Java 8 groupingBy Collector Icon
In this article, we’ll see how the groupingBy collector works using various examples. To understand the material covered in this article, a basic knowledge of Java 8 features is needed. You can have a look at intro to Java 8 Streams and the guide to Java 8’s Collectors.
 

Working with Microsoft Excel in Java

Working with Microsoft Excel in Java Icon
In this tutorial, we will demonstrate the use of the Apache POI and JExcel APIs for working with Excel spreadsheets. Both libraries can be used to dynamically read, write and modify the content of an Excel spreadsheet and provide an effective way of integrating Microsoft Excel into a Java Application.
 

Spring Security – Cache Control Headers

Spring Security – Cache Control Headers Icon
In this article, we’ll explore how we can control HTTP caching with Spring Security. We’ll demonstrate its default behavior, and also explain the reasoning behind it. We’ll then look at ways to change this behavior, either partially or completely.
 

Spring @RequestMapping New Shortcut Annotations

Spring @RequestMapping New Shortcut Annotations Icon
Spring 4.3. introduced some very cool method-level composed annotations to smooth out the handling @RequestMapping in typical Spring MVC projects. In this article, we will learn how to use them in an efficient way.
 

Guide to PriorityBlockingQueue in Java

Guide to PriorityBlockingQueue in Java Icon
In this article, we’ll focus on the PriorityBlockingQueue class and go over some practical examples. Starting with the assumption that we already know what a Queue is, we will first demonstrate how elements in the PriorityBlockingQueue are ordered by priority. Following this, we will demonstrate how this type of queue can be used to block a thread.
 

Guide to Guava’s PreConditions

Guide to Guava’s PreConditions Icon
In this tutorial, we’ll show how to use the Google Guava’s Preconditions class. The Preconditions class provides a list of static methods for checking that a method or a constructor is invoked with valid parameter values. If a precondition fails, a tailored exception is thrown.
 

A Guide to ConcurrentMap

A Guide to ConcurrentMap Icon
Maps are naturally one of the most widely style of Java collection. And, importantly, HashMap is not a thread-safe implementation, while Hashtable does provide thread-safety by synchronizing operations. Even though Hashtable is thread safe, it is not very efficient. Another fully synchronized Map, Collections.synchronizedMap, does not exhibit great efficiency either. If we want thread-safety with high throughput under high concurrency, these implementations aren’t the way to go.
 

Java Thread Class in Five Minutes

Java Thread Class in Five Minutes Icon
In a running Java program, all code is executed in threads and within a thread everything happens sequentially, one instruction after another. When Java (or rather the JVM) launches, it creates one thread for the main method to be executed in. From there, new threads can be created to execute code in parallel to the main one. The most basic way to do that is to use the Thread class.
 

Configuring spring boot for mariadb

Configuring spring boot for mariadb Icon
In this post, I will discuss Spring Boot integration for MariaDB. MariaDB started off as an offshoot of MySQL due to concerns of Oracle’s acquisition of MySQL. Led by the original developers of MySQL, MariaDB has become one of the fastest growing open source databases.
 

Spring security with dao authentication provider

Spring security with dao authentication provider Icon
This is part 6 of the tutorial series for building a web application using Spring Boot. In this post we look at adding a DAO Authentication provider for Spring Security. As the Spring Data JPA dependency is included in our Maven POM, Hibernate gets pulled in and configured with sensible default properties via Spring Boot. This post builds upon 5 previous posts. If you’re not familiar with all the content around Spring,
 

Configuring spring boot for mongodb

Configuring spring boot for mongodb Icon
Spring Data project provides integration for most of the popular databases around. I have already written few posts to configure Spring Boot to use Oracle, MySQL, and PostgreSQL – all RDBMS widely used in the enterprise. Recently we’ve seen a rise in popularity of NoSQL databases. MongoDB has rapidly gained popularity in the enterprise and the Spring community. In this post, I’ll discuss how to use MongoDB with a Spring Boot application.
 

CURL – Post JSON data to Spring REST

CURL – Post JSON data to Spring REST Icon
This article shows you how to use cURL command to POST JSON data to a Spring REST API. To test above REST API, you can use the cURL command to post a JSON data like this...
 

Apache Maven Tutorial

Apache Maven Tutorial Icon
In this tutorial, we’re going to explore this powerful tool for describing, building, and managing Java software projects using a central piece of information — the Project Object Model (POM) — that is written in XML.
 

Using Java Strings and the Swing API in R

Using Java Strings and the Swing API in R Icon
In the first article, "Getting Started with R Using Java," we started with installing R and installing the rJava package. We discussed initializing the JVM, setting the classpath, creating a Java object, and calling a Java method. In this tutorial, we shall discuss the rJava package to use Java Strings and the Swing Java API from R. This tutorial has the following sections:
 

Guide to Guava’s Ordering

Guide to Guava’s Ordering Icon
In this article, we will look at Ordering class from the Guava library. Ordering class implements a Comparator interface and gives us a useful fluent API for creating and chaining comparators. Java 8 has a method Comparator.comparing() that provides a similar functionality so Ordering will be particularly useful in projects that were not migrated to Java 8 yet and this is why we will be using anonymous classes instead of Lambda Expressions.
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