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Introduction to JSF EL 2 1. Introduction Expression Language (EL), is a scripting language that’s seen adoption within many Java frameworks, such as Spring with SpEL and JBoss with JBoss EL. In this article, we’ll focus at the JSF’s implementation of this scripting language – Unified EL. EL is currently… Continue Reading intro-to-jsf-expression-language
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Wiring in Spring: @Autowired, @Resource and @Inject 1. Overview This Spring Framework article will demonstrate the use of annotations related to dependency injection, namely the @Resource, @Inject, and @Autowired annotations. These annotations provide classes with a declarative way to resolve dependencies. For example: @Autowired ArbitraryClass arbObject; as opposed to instantiating… Continue Reading spring-annotations-resource-inject-autowire
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Calculate the Distance Between Two Points in Java 1. Overview In this quick tutorial, we’ll show how to calculate the distance between two points in Java. 2. The Math Formula of the Distance Let’s say we have two points on a plane: the first point A has the coordinates (x1,… Continue Reading java-distance-between-two-points
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Daemon Threads in Java 1. Overview In this short article, we’ll have a look at daemon threads in Java and see what can they be used for. We’ll also explain the difference between daemon threads and user threads. 2. Difference Between Daemon and User Threads Java offers two types of… Continue Reading java-daemon-thread
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Java 8 Unsigned Arithmetic Support 1. Overview From the dawn of Java, all numerical data types are signed. In many situations, however, it’s required to use unsigned values. For example, if we count the number of occurrences of an event, we don’t want to encounter a negative value. The support… Continue Reading java-unsigned-arithmetic
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New in Guava 21 common.util.concurrent 1. Introduction In the previous article, we started exploring the new functionality introduced in the common.collect package. In this quick article, let’s walk through additions to the common.util.concurrent package. 2. AtomicLongMap In concurrent scenarios, standard HashMap might not really work well, as it’s simply not… Continue Reading guava-21-util-concurrent
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Hibernate Second-Level Cache 1. Overview One of the advantages of database abstraction layers such as ORM (object-relational mapping) frameworks is their ability to transparently cache data retrieved from the underlying store. This helps eliminate database-access costs for frequently accessed data. Performance gains can be significant if read/write ratios of cached… Continue Reading hibernate-second-level-cache
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Working with Date Parameters in Spring 1. Introduction In this short tutorial, we’ll take a look at how to accept Date, LocalDate and LocalDateTime parameters in Spring REST requests, both at the request and application levels. 2. The Problem Let’s consider a controller with three methods that accept Date, LocalDate and… Continue Reading spring-date-parameters
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Finding Leap Years in Java 1. Overview In this tutorial, we’ll demonstrate several ways to determine if a given year is a leap year in Java. A leap year is a year that is divisible by 4 and 400 without a remainder. Thus, years that are divisible by 100 but not… Continue Reading java-leap-year
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ProcessEngine Configuration in Activiti 1. Overview In our previous Activiti with Java intro article, we saw the importance of the ProcessEngine and created one via the default static API provided by the framework. Beyond the default, there are other ways of creating a ProcessEngine – which we’ll explore here. 2.… Continue Reading activiti-process-engine
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