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REST API with Play Framework in Java 1. Overview The purpose of this tutorial is to explore the Play Framework and learn how to build REST services with it using Java. We’ll put together a REST API to create, retrieve, update, and delete student records. In such applications, we would… Continue Reading rest-api-with-play
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Converting Kotlin Data Class from JSON using GSON 1. Overview In this short tutorial, we’ll discuss how to convert a data class in Kotlin to JSON string and vice versa using Gson Java library. 2. Maven Dependency Before we start, let’s add Gson to our pom.xml: <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.5</version> </dependency> 3.… Continue Reading kotlin-json-convert-data-class
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Java – Write an InputStream to a File 1. Overview In this quick tutorial, we’re going to illustrate how to write an InputStream to a File – first using plain Java, then Guava and finally the Apache Commons IO library. This article is part of the “Java – Back to… Continue Reading convert-input-stream-to-a-file
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Uploading Files with Servlets and JSP 1. Introduction In this quick tutorial, we’ll see how to upload a file from a servlet. To achieve this, we’ll first see the vanilla Java EE solution with file upload capabilities provided by native @MultipartConfig annotation. Then, we’ll go over the Apache Commons FileUpload library,… Continue Reading upload-file-servlet
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Implementing a Custom Lombok Annotation 1. Overview In this tutorial, we’ll implement a custom annotation using Lombok to remove the boiler-plate around implementing Singletons in an application. Lombok is a powerful Java library that aims to reduce the boiler-plate code in Java. If you’re not familiar with it, here you… Continue Reading lombok-custom-annotation
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Java Byte Array to InputStream 1. Overview In this quick tutorial we’re going to illustrate how to convert a simple byte[] to an InputStream, first using plain java and then the Guava library. This article is part of the “Java – Back to Basic” series here on Baeldung. 2. Convert… Continue Reading convert-byte-array-to-input-stream
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The Maven Site Plugin 1. Overview This tutorial introduces the site plugin, one of the core plugins of the Maven build tool. For an overview of the other core plugins, refer to this tutorial. 2. Plugin Goals The Maven site lifecycle has two phases bound to goals of the site… Continue Reading maven-site-plugin
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The HttpMediaTypeNotAcceptableException in Spring MVC 1. Overview In this quick article, we’ll have a look at the HttpMediaTypeNotAcceptableException exception, and understand the cases where we might encounter it. 2. The Problem When implementing an API endpoint with Spring, we generally need to specify the consumed/produced media types (via the consumes… Continue Reading spring-httpmediatypenotacceptable
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Project Configuration with Spring Table of Contents * 1. Configuration Must Be Environment Specific * 2. The .properties files for Each Environment * 3. The Spring Configuration * 4. Setting the Property in Each Environment * 5. Testing and Maven * 6. Going Further * 7. Conclusion 1. Configuration Must… Continue Reading project-configuration-with-spring
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REST Query Language – Implementing OR Operation 1. Overview In this quick article, we’ll extend the advanced search operations that we implemented in the previous article and include OR-based search criteria into our REST API Query Language. 2. Implementation Approach Before, all the criteria in the search query parameter formed… Continue Reading rest-api-query-search-or-operation
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