Tag Archives: Spring Boot

I was involved in a project recently where we needed to capture the http session id for a websocket request – the reason was to determine the number of websocket sessions utilizing the same underlying http session. The way to do this is based on a sample utilizing the new spring-session module and is described here. The trick to capturing ...

Spring Boot Actuator endpoints allow you to monitor and interact with your application. Spring Boot includes a number of built-in endpoints and you can also add your own.   Adding custom endpoints is as easy as creating a class that extends from org.springframework.boot.actuate.endpoint.AbstractEndpoint. But Spring Boot Actuator offers also possibility to decorate endpoints with MVC layer.   Endpoints endpoint There ...

DIY cartridge is an experimental cartridge that provides a way to test unsupported languages on OpenShift. It provides a minimal, free-form scaffolding which leaves all details of the cartridge to the application developer. This blog post illustrates the use of Spring Boot / Java 8 / Tomcat 8 application with PostgreSQL service bound to it. Creating new application Prerequisite Before ...

Exposing Spring Data repositories over REST is pretty easy with Spring Boot and Spring Data REST. With minimal code one can create REST representations of JPA entities that follow the HATEOAS principle. I decided to re-use Spring PetClinic’s JPA entities (business layer) as the foundation for this article.       Application foundation The PetClinic’s model is relatively simple, but ...

WARNING: I am not an expert of Spring Boot. There are a lot of things that I find really interesting about it and of course that can really improve your day-to-day work. Moreover I don’t have anything against Spring Boot nor people who develop it or use it. But I think that community are overestimating/overvenerating this product. A year ago ...

Whilst building a Spring Boot application you may encounter a need of adding a mail configuration. Actually, configuring the mail in Spring Boot does not differ much from configuring it in Spring Bootless application. But how to test that mail configuration and submission is working fine? Let’s have a look. I assume that we have a simple Spring Boot application ...

Exposing a REST based endpoint for a Spring Boot application or for that matter a straight Spring MVC application is straightforward, the following is a controller exposing an endpoint to create an entity based on the content POST’ed to it:                 @RestController @RequestMapping("/rest/hotels") public class RestHotelController { .... @RequestMapping(method=RequestMethod.POST) public Hotel create(@RequestBody @Valid ...

I’ve been working on migrating some batch jobs for Podcastpedia.org to Spring Batch. Before, these jobs were developed in my own kind of way, and I thought it was high time to use a more “standardized” approach. Because I had never used Spring with java configuration before, I thought this were a good opportunity to learn about it, by configuring the Spring ...

Apparently writing a URL shortener service is the new “Hello, world!” in the IoT/microservice/era world. It all started with A URL shortener service in 45 lines of Scala – neat piece of Scala, flavoured with Spray and Redis for storage. This was quickly followed with A url shortener service in 35 lines of Clojure and even URL Shortener in 43 ...