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Types of JPA Queries 1. Overview In this tutorial, we’ll discuss the different types of JPA queries. Moreover, we’ll focus on comparing the differences between them and expanding on each one’s pros and cons. 2. Setup Firstly, let’s define the UserEntity class we’ll use for all examples in this article:… Continue Reading jpa-queries
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Drools Using Rules from Excel Files 1. Overview [.s1]#https://www.drools.org/[Drools] has support for managing business rules in a spreadsheet format. # In this article, we’ll see a quick example of using Drools to manage business rules using an Excel file. 2. Maven Dependencies Let’s add the required Drools dependencies into our… Continue Reading drools-excel
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SSL Handshake Failures 1. Overview Secured Socket Layer (SSL) is a cryptographic protocol which provides security in communication over the network. In this tutorial, we’ll discuss various scenarios that can result in an SSL handshake failure and how to it. Note that our Introduction to SSL using JSSE covers the basics of… Continue Reading java-ssl-handshake-failures
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HttpClient 4 Cookbook 1. Overview This cookbook shows how to use the Apache HttpClient 4 in a variety of examples and use-cases. The focus is on HttpClient 4.3.x and above, so some of the examples may not work with the older versions of the API. The format of the cookbook… Continue Reading httpclient4
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A Guide to Rolling File Appenders 1. Overview While log files often convey useful information, they naturally grow bigger over time, and if allowed to grow indefinitely, their size could become a problem. Logging libraries address this problem using rolling file appenders, which automatically “roll” or archive the current log… Continue Reading java-logging-rolling-file-appenders
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Java Weekly, Issue 252 Here we go… 1. Spring and Java ===== >> 5 Things Beginners Need to Know Before Using JPA / Hibernate / EclipseLink [thoughts-on-java.org*]* A good primer for developers who are thinking about implementing a JPA solution. >> Functional Bean Registrations in Spring Cloud Function [spring.io*]* A quick glance… Continue Reading java-weekly-252
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Formatting with printf() in Java 1. Introduction In this tutorial, we’ll demonstrate different examples of formatting with the printf() method. The method is part of the java.io.PrintStream class and provides String formatting similar to the printf() function in C. 2. Syntax We can use one of the following PrintStream methods to format… Continue Reading java-printstream-printf
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Spring YAML Configuration 1. Overview One of the ways of configuring Spring applications is using YAML configuration files. In this quick article, we’ll configure different profiles for a simple Spring Boot application using YAML. Further reading: A Quick Guide to Spring @Value Learn to use the Spring @Value annotation to… Continue Reading spring-yaml
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Converting between an Array and a List in Java 1. Overview This quick article is going to show how to convert between an Array and a List using core Java libraries, Guava or Apache Commons Collections. This article is part of the “Java – Back to Basic” series here on… Continue Reading convert-array-to-list-and-list-to-array
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Quick Guide to the Spring @Enable Annotations 1. Overview Spring comes with a set of @Enable annotations that make it easier for developers to configure a Spring application. These annotations are used in conjunction with the @Configuration annotation. In this article we will be looking at some these annotations: @EnableWebMvc… Continue Reading spring-enable-annotations
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