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You can set multiple options of the same level, so you can can for example configure 2 component options, and 3 endpoint options etc.

Defining a custom error message as-is

If you want to define custom error messages to be sent back to the client with a HTTP error code (eg such as 400, 404 etc.) then from Camel 2.14.1 onwards you just set a header with the key Exchange.HTTP_RESPONSE_CODE to the error code (must be 300+) such as 404. And then the message body with any reply message, and optionally set the content-type header as well. There is a little example shown below:

                restConfiguration().component("restlet").host("localhost").port(portNum).bindingMode(RestBindingMode.json);
                // use the rest DSL to define the rest services
                rest("/users/")
                    .post("lives").type(UserPojo.class).outType(CountryPojo.class)
                        .route()
                            .choice()
                                .when().simple("${body.id} < 100")
                                    .bean(new UserErrorService(), "idToLowError")
                                .otherwise()
                                    .bean(new UserService(), "livesWhere");

In this example if the input id is a number that is below 100, we want to send back a custom error message, using the UserErrorService bean, which is implemented as shown:

public class UserErrorService {
    public void idToLowError(Exchange exchange) {
        exchange.getIn().setBody("id value is too low");
        exchange.getIn().setHeader(Exchange.CONTENT_TYPE, "text/plain");
        exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 400);
    }
}

In the UserErrorService bean we build our custom error message, and set the HTTP error code to 400. This is important, as that tells rest-dsl that this is a custom error message, and the message should not use the output pojo binding (eg would otherwise bind to CountryPojo).

Integration a Camel component with Rest DSL

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