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Converting a Stack Trace to a String in Java 1. Introduction When dealing with exceptions in Java, we’re frequently logging or simply displaying stack traces. However, sometimes, we don’t want just to print the stack trace, we might need to write the stack trace to a file, to a database… Continue Reading java-stacktrace-to-string
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Advanced Querying in Apache Cayenne 1. Overview Previously, we’ve focused on how to get started with Apache Cayenne. In this article, we’ll cover how to write simple and advanced queries with the ORM. 2. Setup The setup is similar to the one used in the previous article. Additionally, before each… Continue Reading apache-cayenne-query
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Java equals() and hashCode() Contracts 1. Overview In this tutorial, we’ll introduce two methods that closely belong together: equals() and hashCode(). We’ll focus on their relationship with each other, how to correctly override them, and why we should override both or neither. 2. equals() The Object class defines both the… Continue Reading java-equals-hashcode-contracts
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How to Disable Console Logging in Spring Boot 1. Overview Usually, console logs give us the opportunity to debug our system in an easy and intuitive way. Nevertheless, there are occasions when we don’t want to enable this feature in our system. In this quick tutorial, we’ll see how to… Continue Reading spring-boot-disable-console-logging
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Spring 5 Functional Bean Registration 1. Overview Spring 5 comes with support for functional bean registration in the application context. Simply put, this can be done through overloaded versions of a new registerBean() method defined in the GenericApplicationContext class. Let’s have a look at a few examples of this functionality… Continue Reading spring-5-functional-beans
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Service Locator Pattern 1. Introduction In this tutorial, we’re going to learn about the Service Locator design pattern in Java. We’ll describe the concept, implement an example and highlight the pros and cons of its use. 2. Understanding the Pattern The purpose of the Service Locator pattern is to return… Continue Reading java-service-locator-pattern
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java.util.Date vs java.sql.Date ** 1. Overview In this tutorial, we’re going to compare two date classes: java.util.Date and java.sql.Date. Once we complete the comparison, it should be clear which one to use and why. 2. java.util.Date The java.util.Date class represents a particular moment in time, with millisecond precision since the 1st of… Continue Reading java-util-date-sql-date
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Guide to WeakHashMap in Java 1. Overview In this article, we will be looking at a WeakHashMap from the java.util package. In order to understand the data structure, we’ll use it here to roll out a simple cache implementation. However, keep in mind that this is meant to understand how… Continue Reading java-weakhashmap
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Implementing a Runnable vs Extending a Thread 1. Introduction “Should I implement a Runnable or extend the Thread class”? is quite a common question. In this article, we’ll see which approach makes more sense in practice and why. 2. Using Thread Let’s first define a SimpleThread class that extends Thread:… Continue Reading java-runnable-vs-extending-thread
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The Difference Between CDI and EJB Singleton 1. Overview In this tutorial, we’ll take a closer look at two types of singletons available in Java EE. We’ll explain and demonstrate the differences and see the usages suitable for each one. First, let’s see what singletons are all about before getting… Continue Reading jee-cdi-vs-ejb-singleton
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