Micronaut can convert String values defined as a number followed by (case-insensitive) KB/MB/GB to a number value in certain cases. The conversion service in Micronaut supports the @ReadableBytes annotation that we can apply to a method parameter. Micronaut will then parse the String value and convert it to a number. The value 1Kb is converted to 1024. We can use this for example in a configuration class or path variable in a controller.

Micronaut is reactive by nature and uses RxJava2 as implementation for the Reactive Streams API by default. RxJava2 is on the compile classpath by default, but we can easily use Project Reactor as implementation of the Reactive Streams API. This allows us to use the Reactor types Mono and Flux. These types are also used by Spring’s Webflux framework and makes a transition from Webflux to Micronaut very easy.

How we do use Project Reactor in our Micronaut application? We only have to add the dependency the Project Reactory core library to our project. In the following example we add it to our build.gradle file as: