Apache camel rest dsl RestBindingMode.json is throwing exception

[rahul vashishth]

I am trying to build rest api using camel-rest-dsl. I have tried with
multiple provider, spark-rest, jetty. But it throwing marshelling exception
when i use RestBindingMode.json, if i remove rest binding mode then it
works fine with string type.

I am using version 2.22.1

*SpringRouteBuilder*
*--------------------------*
@Component
public class RestAPIRoutes extends SpringRouteBuilder {
    @Override
    public void configure() throws Exception {
        restConfiguration().component("spark-rest")
            .bindingMode(RestBindingMode.json)
            .port(8787)
            .dataFormatProperty("prettyPrint","true");


rest("/balance").produces("application/json").consumes("application/json")
            /* mock api */

.get("/query").route().bean(BalanceService.class,"fetchBalance").endRest()
            /* fetch balance by msisdn*/
            .get("/query/{msisdn}").description("Fetch line balance by
msisdn")

.type(BalanceInfo.class).to("bean:balanceService?method=fetchBalance(${header.msisdn})")

.post("/update").type(BalanceInfo.class).outType(BalanceInfo.class).to("bean:balanceService?method=updateBalance");
    }
}

Here balanceService is a simple Spring @Service with overloaded method and
BalanceInfo is simple pojo class with two field and getter setters.

*Pom dependency*

  <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-spark-rest</artifactId>
        <version>2.22.1</version>
    </dependency>
<dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-spring-boot-starter</artifactId>
        <version>2.22.1</version>
    </dependency>

*Exception*

org.apache.camel.processor.binding.BindingException: Cannot bind to json as
message body is not json compatible.
Exchange[ID-LTB0202777-MAC-1540301942376-3-1]
    at
org.apache.camel.processor.RestBindingAdvice.unmarshal(RestBindingAdvice.java:317)
~[camel-core-2.22.1.jar:2.22.1]
    at
org.apache.camel.processor.RestBindingAdvice.before(RestBindingAdvice.java:137)
~[camel-core-2.22.1.jar:2.22.1]


Please help

Rahul