Code

Step-by-Step guide

Add dependnacy in pom.xml

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-openapi-java</artifactId>
    <version>3.14.0</version> <!-- Same as Camel Core -->
</dependency>

Java

@Component
public class RestDsl extends RouteBuilder {
@Override
public void configure() throws Exception {
    restConfiguration()
            .component("servlet")
            .bindingMode(RestBindingMode.json)
            .dataFormatProperty("prettyPrint", "true")
            .apiContextPath("/api-doc")
            .apiProperty("api.title", "Saggu.UK Camel Rest APIs")
            .apiProperty("api.version", "1.0")
            .apiContextListing(true)
    ;

    rest()
          .consumes("application/json").produces("application/json")
            .get("/weather/{city}")
            .responseMessage("200", "On good request")
            .responseMessage("404", "For invalid city name")
            .description("Get weather data for a given city")
            .param()
                .name("city").type(path).description("The name of the city e.g. London").dataType("string")
            .endParam()
            .outType(WeatherDto.class).to("direct:get-weather-data")
}
}