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Guide to Java 8 groupingBy Collector 1. Introduction In this article, we’ll see how the groupingBy collector works using various examples. To understand the material covered in this article, a basic knowledge of Java 8 features is needed. You can have a look at the intro to Java 8 Streams… Continue Reading java-groupingby-collector
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Query Entities by Dates and Times with Spring Data JPA 1. Introduction In this quick tutorial, we’ll see how to query entities by dates with Spring Data JPA. We’ll first refresh our memory about how to map dates and times with JPA. Then, we’ll create an entity with date and time fields… Continue Reading spring-data-jpa-query-by-date
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Java – Delete a File This quick article illustrates how to delete a File in Java – first using JDK 6, then JDK 7 and finally the Apache Commons IO library. This article is part of the “Java – Back to Basic” series here on Baeldung. 1. With Java –… Continue Reading how-to-delete-a-file-in-java
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RESTEasy Client API 1. Introduction In the previous article we focused on the RESTEasy server side implementation of JAX-RS 2.0. JAX-RS 2.0 introduces a new client API so that you can make HTTP requests to your remote RESTful web services. Jersey, Apache CXF, Restlet and RESTEasy are only a subset… Continue Reading resteasy-client-tutorial
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Bean Validation in Jersey 1. Overview In this tutorial, we’re going to take a look at Bean Validation using the open source framework Jersey. As we’ve already seen in previous articles, Jersey is an open source framework for developing RESTful Web Services. We can get more details about Jersey in… Continue Reading jersey-bean-validation
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Combining JPA And/Or Criteria Predicates 1. Overview The JPA Criteria API can be used to easily add multiple AND/OR conditions when querying records in a database. In this tutorial, we’ll explore a quick example of JPA criteria queries that combine multiple AND/OR predicates. If you’re not familiar with predicates, we… Continue Reading jpa-and-or-criteria-predicates
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Generate Spring Boot REST Client with Swagger 1. Introduction In this article, we’ll use the Swagger CodeGen project to generate a REST client from an OpenAPI/Swagger spec file. Also, we’ll create a Spring Boot project, where we’ll use generated classes. We’ll use the Swagger Petstore API example for everything. 2.… Continue Reading spring-boot-rest-client-swagger-codegen
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Ratpack with Groovy 1. Overview Ratpack is a set of lightweight Java libraries for building scalable HTTP applications with reactive, asynchronous, and non-blocking features. Additionally, Ratpack also provides integration with technologies and frameworks like Google Guice, Spring Boot, RxJava and Hystrix. In this tutorial, we’ll explore how to use Ratpack… Continue Reading ratpack-groovy
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Java Weekly, Issue 232 Here we go… 1. Spring and Java ===== >> Truth First, or Why You Should Mostly Implement Database First Designs [blog.jooq.org] Some solid points to consider when thinking about where the source of truth in your system is, and how to make sure your architecture reflects that.… Continue Reading java-weekly-232
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Automatic Generation of the Builder Pattern with FreeBuilder [[builder pattern]] === 1. Overview [[builder pattern]]In this tutorial, we’ll use the FreeBuilder library to generate builder classes in Java. [[design patterns]] === 2. Builder Design Pattern [[design patterns]]Builder is one of the most widely used Creation Design Patterns in object-oriented languages.… Continue Reading java-builder-pattern-freebuilder
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