Micronaut Mastery: Binding Request Parameters to POJO

Micronaut supports the RFC-6570 URI template specification to define URI variables in a path definition. The path definition can be a value of the @Controller annotation or any of the routing annotations for example @Get or @Post. We can define a path variable as {?binding*} to support binding of request parameters to all properties of an object type that is defined as method argument with the name binding. We can even use the Bean Validation API (JSR380) to validate the values of the request parameters if we add an implementation of this API to our class path.

In the following example controller, we have the method items with the method argument sorting of type Sorting. We want to map the request parameters ascending and field to the properties of the Sorting object. We only have the use the path variable {?sorting*} to make this happen. We also add the dependency io.micronaut.configuration:micronaut-hibernate-validator to our class path. If we use Gradle we can add compile("io.micronaut.configuration:micronaut-hibernate-validator") to our build file.

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