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Filtering a Stream of Optionals in Java 1. Introduction In this article, we’re going to talk about how to filter out non-empty values from a Stream of Optionals. We’ll be looking at three different approaches – two using Java 8 and one using the new support in Java 9. We… Continue Reading java-filter-stream-of-optional
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Hibernate Mapping Exception – Unknown Entity 1. The Problem This article is going to discuss the org.hibernate.MappingException: Unknown entity issue and solutions, both for Hibernate as well as for a Spring and Hibernate environment. Further reading: Bootstrapping Hibernate 5 with Spring A quick and practical guide to integrating Hibernate 5… Continue Reading hibernate-mappingexception-unknown-entity
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Spring Boot Support for jOOQ 1. Overview This tutorial is a follow-up to the Introduction to jOOQ with Spring article, covering the ways that jOOQ can be used within a Spring Boot application. If you have not gone through that tutorial, please take a look at it and follow the… Continue Reading spring-boot-support-for-jooq
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Spring PostConstruct and PreDestroy Annotations Spring 1. Introduction Spring allows us to attach custom actions to bean creation and destruction. We can, for example, do it by implementing the InitializingBean and DisposableBean interfaces. In this short tutorial, we’ll look at a second possibility: the @PostConstruct and @PreDestroy annotations. 2. @PostConstruct Spring calls methods… Continue Reading spring-postconstruct-predestroy
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Vavr Support in Spring Data 1. Overview In this quick tutorial, we’re going to take a look at the support for Vavr in Spring Data – which was added in the 2.0.0 Spring build snapshot. More specifically, we’re going to show an example of using Vavr Option and Vavr collections… Continue Reading spring-vavr
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Immutable Set in Java 1. Introduction In this tutorial, we’re going to have a look at different ways of constructing an immutable set in Java. But first, let’s understand the immutable set and see why we need it. 2. What is an Immutable Set? In general, an immutable object will… Continue Reading java-immutable-set
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Guide to Guava’s Reflection Utilities 1. Overview In this article, we’ll be looking at the Guava reflection API – which is definitely more versatile compared to the standard Java reflection API. We’ll be using Guava to capture generic types at runtime, and we’ll making good use of Invokable as well.… Continue Reading guava-reflection
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Thymeleaf: Custom Layout Dialect 1. Introduction Thymeleaf is a Java template engine for processing and creating HTML, XML, JavaScript, CSS and plain text. For an intro to Thymeleaf and Spring, have a look at this write-up. In this write-up we’ll focus on templating – something that most reasonably complex sites… Continue Reading thymeleaf-spring-layouts
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Spring Performance Logging 1. Overview In this tutorial, we’ll look into a couple of basic options the Spring Framework offers for performance monitoring. 2. PerformanceMonitorInterceptor A simple solution to get basic monitoring functionality for the execution time of our methods, we can make use of the PerformanceMonitorInterceptor class out of… Continue Reading spring-performance-logging
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Introduction to Chronicle Queue 1. Overview Chronicle Queue persists every single message using a memory-mapped file. This allows us to share messages between processes. It stores data directly to off-heap memory, therefore, making it free of GC overhead. It is designed for providing low-latency message framework for high-performance applications. In… Continue Reading java-chronicle-queue
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