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onException(JsonParseException.class)
    .handled(true)
    .setHeader(Exchange.HTTP_RESPONSE_CODE, constant(400))
    .setHeader(Exchange.CONTENT_TYPE, constant("text/plain"))
    .setBody().constant("Invalid json data");

Parameter default Values

You can specify default values for parameters in the rest-dsl, such as the verbose parameter below:

  rest("/customers/")
      .get("/{id}").to("direct:customerDetail")
      .get("/{id}/orders")
        .param().name("verbose").type(RestParamType.query).defaultValue("false").description("Verbose order details").endParam()
          .to("direct:customerOrders")
      .post("/neworder").to("direct:customerNewOrder");

From Camel 2.17 onwards then the default value is automatic set as header on the incoming Camel Message. So if the call the /customers/id/orders do not include a query parameter with key verbose then Camel will now include a header with key verbose and the value false because it was declared as the default value. This functionality is only applicable for query parameters.

Integrating a Camel component with Rest DSL

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