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Using libphonenumber to Validate Phone Numbers
1. Overview In this quick tutorial, we'll see how to use Google's open-source library libphonenumber to validate phone numbers in Java. 2. Maven Dependency First, we'll need to add the dependency for...
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Using JNA to Access Native Dynamic Libraries
1. Overview In this tutorial, we'll see how to use the Java Native Access library (JNA for short) to access native libraries without writing any JNI (Java Native Interface) code. 2. Why JNA? For many...
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Checking if a Java Class is ‘abstract’ Using Reflection
1. Overview In this quick tutorial, we'll discuss how we can check if a class is abstract or not in Java by using the Reflection API. 2. Example Class To demonstrate this, we'll create an...
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Differences Between Netflix Feign and OpenFeign
1. Overview In this tutorial, we're going to describe the differences between Spring Cloud Netflix Feign and Spring Cloud OpenFeign. 2. Feign Feign makes writing web service clients easier by providing...
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Performing Calculations in the Database vs. the Application
1. Overview Often, we find it difficult to decide whether a calculation should be performed in the database (RDBMS) or application code to get good performance along with convenience at the same time....
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Background Jobs in Spring with JobRunr
1. Overview In this tutorial, we're going to look into distributed background job scheduling and processing in Java using JobRunr and have it integrate with Spring. 2. About JobRunr JobRunr is a...
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How to Stop Execution After a Certain Time in Java
1. Overview In this article, we'll learn how we can end a long-running execution after a certain time. We'll explore the various solutions to this problem. Also, we'll cover some of their pitfalls. 2....
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Where Does H2’s Embedded Database Store The Data?
1. Introduction In this article, we'll learn how to configure the Spring Boot application to use the embedded H2 database and then see where H2's embedded database stores the data. H2 database is a...
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Java Weekly, Issue 354
1. Spring and Java >> Shenandoah in JDK 11 – Interview With Red Hat's Team [infoq.com] Deep insights from Kennke and Shipilev about Shenandoah's history, the interaction with other JVM parts and...
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Difference Between @ComponentScan and @EnableAutoConfiguration in Spring Boot
1. Introduction In this quick tutorial, we'll learn about the differences between @ComponentScan and @EnableAutoConfiguration annotations in the Spring Framework. 2. Spring Annotations Annotations make...
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Creational Design Patterns in Core Java
1. Introduction Design Patterns are common patterns that we use when writing our software. They represent established best practices developed over time. These can then help us to ensure that our code...
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Java Weekly, Issue 355
1. Spring and Java >> Project Panama and jextract [inside.java] Explore the secure, efficient, and modern native interaction APIs from Project Panama: foreign-Memory Access API and Foreign Linker...
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Detecting If a Spring Transaction Is Active
1. Overview Detecting transactions could be useful for audit purposes or for dealing with a complex code base where good transaction conventions weren't implemented. In this brief tutorial, we'll go...
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Finding a Free Port in Java
1. Overview When starting a socket server in our Java application, the java.net API requires us to specify a free port number to listen on. The port number is required so that the TCP layer can...
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Getting Database URL From JDBC Connection Object
1. Overview In this quick tutorial, we'll discuss how we can get the database URL from a JDBC Connection object. 2. Example Class To demonstrate this, we'll create a DBConfiguration class with a method...
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Apache Spark: Differences between Dataframes, Datasets and RDDs
1. Overview Apache Spark is a fast, distributed data processing system. It does in-memory data processing and uses in-memory caching and optimized execution resulting in fast performance. It provides...
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Guide to Jenkins Parameterized Builds
1. Introduction Jenkins is one of the most popular CI/CD tools in use today. It allows us to automate every aspect of the software lifecycle, from building all the way to deploying. In this tutorial,...
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Object States in Hibernate’s Session
1. Introduction Hibernate is a convenient framework for managing persistent data, but understanding how it works internally can be tricky at times. In this tutorial, we'll learn about object states and...
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Constants in Java: Patterns and Anti-Patterns
1. Introduction In this article, we're going to learn about using constants in Java with a focus on common patterns and anti-patterns. We'll start with some basic conventions for defining constants....
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Performance of removeAll() in a HashSet
1. Overview HashSet is a collection for storing unique elements. In this tutorial, we'll discuss the performance of the removeAll() method in the java.util.HashSet class. 2. HashSet.removeAll() The...
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