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Multipart Uploads in Amazon S3 with Java 1. Overview In this tutorial, we’ll see how to handle multipart uploads in Amazon S3 with AWS Java SDK. Simply put, in a multipart upload, we split the content into smaller parts and upload each part individually. All parts are re-assembled when received.… Continue Reading aws-s3-multipart-upload
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HttpClient Basic Authentication 1. Overview This tutorial will illustrate how to configure Basic Authentication on the Apache HttpClient 4. If you want to dig deeper and learn other cool things you can do with the HttpClient – head on over to the main HttpClient tutorial. Further reading: HttpAsyncClient Tutorial HttpAsyncClient… Continue Reading httpclient-4-basic-authentication
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Immutable Map Implementations in Java 1. Overview It is sometimes preferable to disallow modifications to the java.util.Map such as sharing read-only data across threads. For this purpose, we can use either an Unmodifiable Map or an Immutable Map. In this quick tutorial, we’ll see what’s the difference between them. Then, we’ll present… Continue Reading java-immutable-maps
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Java Weekly, Issue 269 Here we go… 1. Spring and Java ===== >> A categorized list of all Java and JVM features since JDK 8 [advancedweb.hu] A handy reference covering everything from new language features down to the new version naming scheme. Good stuff. >> Tap Compare Testing with Diferencia and Java Microservices… Continue Reading java-weekly-269
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Iterating Over an Instance of org.json.JSONObject 1. Introduction In this tutorial, we’ll look at a couple of approaches for iterating over a JSONObject, a simple JSON representation for Java. We’ll start with a naive solution and then look at something a little more robust. 2. Iterating Through a JSONObject Let’s start… Continue Reading jsonobject-iteration
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Java Weekly, Issue 286 Here we go… 1. Spring and Java ===== >> Getting Started with Spring Cloud Gateway [spring.io] This new series begins with a quick look at creating a simple API gateway, an essential part of any microservices architecture. This is one to follow closely. >> The best… Continue Reading java-weekly-286
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Spring MVC Guides Spring MVC provides tools driving both typical web applications as well as REST APIs. Let’s jump right in. Basic Spring MVC Annotations + Spring Web Annotations + @RequestMapping in Spring + Spring @RequestParam Annotation + The @ModelAttribute Annotation ** + The Spring @Controller and @RestController Annotations +… Continue Reading spring-mvc
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Enabling Transaction Locks in Spring Data JPA 1. Overview In this quick tutorial, we’ll discuss enabling transaction locks in Spring Data JPA for custom query methods and predefined repository CRUD methods. We will also have a look at different lock types and setting transaction lock timeouts. 2. Lock Types JPA… Continue Reading java-jpa-transaction-locks
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Debugging the Spring MVC 404 “No mapping found for HTTP request” Error 1. Introduction Spring MVC is a traditional application built using the Front Controller Pattern. DispatcherServlet, which acts as the front controller, is responsible for routing and request processing. As with any web application or website, Spring MVC returns… Continue Reading spring-mvc-404-error
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Test a REST API with curl 1. Overview This tutorial gives a brief overview of testing a REST API using curl. curl is a command-line tool for transferring data and supports about 22 protocols including HTTP. This combination makes it a very good ad-hoc tool for testing our REST… Continue Reading curl-rest
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