When developing programs that are larger than minuscule I prefer to structure them in a fashion as once inspired by an article by Simon Brown named “An Architecturally Evident Coding Style” that I read some years ago. Not only does this help me to organize my code in a, to me, familiar way but it… Read More »
In this article I will, using a test-case, show how to publish and consume MQTT messages using the reactive HiveMQ client library. I will use the Mosquitto MQTT broker for the test. The example application will be implemented using Spring Boot 3 and Java 17. The example will initially allow unauthenticated access that later will… Read More »
In this article I will show how to reduce the set of application configuration properties available to a Spring Boot test. The reason for me wanting to do this is to be able to write tests for code that relies on a dynamic set of configuration properties. The source-code of the completed example project can… Read More »
In this article I will show how I added disk-space metrics to the set of default metrics made available for scraping by Prometheus. There are a few ways to accomplish this but I have chosen to use data from the Spring Boot Actuator health data. A complete Spring Boot application with disk-space metrics is available… Read More »
The following are a few words and some simple examples showing how to use Spring Data DynamoDB to store and retrieve data in a DynamoDB database. In the example, which consists of a few tests, I will use a local instance of DynamoDB running in a container. No prior knowledge of DynamoDB is assumed, though… Read More »
These are a few short notes on how to log requests received by a WireMock server as well as any mock response generated in connection to a request. I have found this to come in handy when having multiple mappings loaded into WireMock and an incorrect mapping being chosen in the test.In addition, I will… Read More »
For quite some time now I have thought it would be very useful to have some type of id associated with the processing of a request logged in connection to the log messages generated when the request is processed. This in order to be able to query Elasticsearch or similar for all the logs generated… Read More »
In 2016 I wrote a series of articles in which I developed a REST service which used Jersey’s asynchronous response processing and RxJava in a Spring Boot application. Since then I have used Spring WebFlux, which is the reactive, non-blocking and event-driven counterpart of Spring MVC. I have also had the opportunity to at least… Read More »
Just a short note to say that my book Core Spring 5 Certification in Detail has been updated to reflect the curriculum released by Pivotal in May 2019. Thanks for your patience if you have been waiting for this update! Please do not hesitate to contact me if there are any errors, omissions or with… Read More »
Given that Oracle’s Java licensing model has changed, I have uninstalled all Oracle JDKs from my computer and am using SDKMAN to download free Java JDK versions. However I did not find my favourite Java JVM monitoring tools, VisualVM and Mission Control, in any of the JDKs that I downloaded with SDKMAN. VisualVM VisualVM was… Read More »