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Template Engines in Groovy 1. Overview In this introductory tutorial, we’ll explore the concept of template engines in Groovy. In Groovy, we can use GStrings to generate dynamic text easily. However, the template engines provide a better way of handling dynamic text using static templates. These templates are convenient in… Continue Reading groovy-template-engines
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Spring Data JPA @Modifying Annotation 1. Introduction In this short tutorial, we’ll learn how to create update queries with the Spring Data JPA @Query annotation. We’ll achieve this by using the @Modifying annotation. First, we’ll refresh our memory and see how to make queries using Spring Data JPA. After that,… Continue Reading spring-data-jpa-modifying-annotation
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Handling NoClassDefFoundError for JAXBException in Java 9 1. Introduction For anyone who has tried upgrading to Java 9, they have likely experienced some sort of NoClassDefFoundError when compiling code that previously worked in earlier versions of Java. In this article, we’ll look at a common missing class, JAXBException, and different ways… Continue Reading java-9-jaxbexception
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Spring Security Context Propagation with @Async 1. Introduction In this tutorial, we are going to focus on the propagation of the Spring Security principal with @Async. _ _ By default, the Spring Security Authentication is bound to a ThreadLocal – so, when the execution flow runs in a new thread… Continue Reading spring-security-async-principal-propagation
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Immutable ArrayList in Java 1. Overview This quick tutorial will show how to make an ArrayList immutable with the core JDK, with Guava and finally with Apache Commons Collections 4. This article is part of the “Java – Back to Basic” series here on Baeldung. Further reading: Collect a Java… Continue Reading java-immutable-list
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Auditing with JPA, Hibernate, and Spring Data JPA 1. Overview In the context of ORM, database auditing means tracking and logging events related to persistent entities, or simply entity versioning. Inspired by SQL triggers, the events are insert, update and delete operations on entities. The benefits of database auditing are… Continue Reading database-auditing-jpa
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Baeldung Weekly Review 33 At the very beginning of last year, I decided to track my reading habits and share the best stuff here, on Baeldung. Haven’t missed a review since. Here we go… 1. Spring and Java ===== >> Java SE 8 Optional, a pragmatic approach [joda] Some solid,… Continue Reading 2015-week-review-33
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A Simple Tagging Implementation with MongoDB 1. Overview In this tutorial, we’ll take a look at a simple tagging implementation using Java and MongoDB. For those unfamiliar with the concept, a tag is a keyword used as a “label” to group documents into different categories. This allows the users to… Continue Reading mongodb-tagging
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Using a Mutex Object in Java 1. Overview In this tutorial, we’ll see different ways to implement a mutex in Java. 2. Mutex In a multithreaded application, two or more threads may need to access a shared resource at the same time, resulting in unexpected behavior. Examples of such shared… Continue Reading java-mutex
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Image to Base64 String Conversion 1. Overview In this quick tutorial, we’re going to cover how to encode image file to a Base64 String, then decode it to retrieve the original image using Apache Common IO and Java 8 native Base64 features. This operation could be applied for any binary files or… Continue Reading java-base64-image-string
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