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Re: Simple example of passing an object in from rest to another microservice


Thanks, Claus!



On Friday, June 15, 2018 1:29 AM, Claus Ibsen <claus.ibsen@xxxxxxxxx> wrote:



Hi

You are setting the content-length header to null
  .setHeader(Exchange.CONTENT_LENGTH, constant(null))

If you want to remove it, then there is a removeHeader which you
should use instead

On Fri, Jun 15, 2018 at 1:24 AM, Steve Hiller <shetc@xxxxxxxxxxxxx> wrote:
> Ok, next version, which works with 1 gotcha:
>
>
> @Component
> public class RestRoute extends RouteBuilder {
>
>   @Override
>   public void configure()
>   throws Exception
>   {
>     restConfiguration()
>       .component("servlet")
>       .producerComponent("http4")
>       .bindingMode(RestBindingMode.json);
>
>     rest("/candidate")
>      .post("applyx")
>      .consumes(MediaType.APPLICATION_JSON_VALUE)
>      .type(Candidate.class)
>      .route()
>        .to("myProcessor")
>        .marshal().json(JsonLibrary.Jackson)
>        .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
>        .setHeader(Exchange.CONTENT_LENGTH, constant(null))
>        .to("rest:post:to/candidate/applyx?bridgeEndpoint=true&host={{service:CANDIDATE_SERVICE}}")
>        .log("FROM = ${body}")
>        ;
>     }
> }
>
>
> So to the gotcha: I need to add the following prop to the Spring Boot application.properties file:
>
> spring.jackson.serialization.FAIL_ON_EMPTY_BEANS=false
>
> or else I get the message:
>
> com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.apache.camel.converter.stream.CachedOutputStream$WrappedInputStream and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)
> at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
> at com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
> at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
> at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)
> at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
> at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
> at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1429)
> at com.fasterxml.jackson.databind.ObjectWriter._configAndWriteValue(ObjectWriter.java:1158)
> at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:988)
> at org.apache.camel.component.jackson.JacksonDataFormat.marshal(JacksonDataFormat.java:166)
>
> Should I be worried about this?
>
>
> On Thursday, June 14, 2018 11:56 AM, Steve Hiller <shetc@xxxxxxxxxxxxx> wrote:
>
>
>
> Thanks, Claus! Now the following works for posting an object to the test uri http://localhost:8082/to/candidate/applyx.
> But is this the correct way?
> @Component
> public class RestRoute extends RouteBuilder {
>
>   @Override
>   public void configure()
>   throws Exception
>   {
>
>     HttpComponent http = getContext().getComponent("http4", HttpComponent.class);
>     http.setAllowJavaSerializedObject(true);
>
>     restConfiguration()
>       .component("servlet")
>       .producerComponent("http4")
>       .host("localhost")
>       .port(8082);
>
>     Candidate c = new Candidate();
>     c.setFirstName("Joe");
>     c.setLastName("Blow");
>
>     from("timer://foo?repeatCount=1&delay=5s")
>       .process(new Processor() {
>          @Override
>          public void process(Exchange exchange) throws Exception {
>            exchange.getIn().setBody(c);
>          }})
>       .marshal().json(JsonLibrary.Jackson)
>       .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
>       .to("rest:post:to/candidate/applyx")
>       .log("body = ${body}");
>    }
>
> }
>
>
>
> On Thursday, June 14, 2018 5:40 AM, Claus Ibsen <claus.ibsen@xxxxxxxxx> wrote:
>
>
>
> Hi
>
> For binding to POJO classes you need to add camel-jackson to the
> classpath, and have either JAXB or Jackson annotations on the class as
> well.
>
>
> On Wed, Jun 13, 2018 at 7:34 PM, Roman Vottner <rovo@xxxxxx> wrote:
>> Can you try to define
>>
>>    .bindingMode(RestBindingMode.json)
>>
>> to your restConfiguration or post() definition? According to the docs (http://camel.apache.org/rest-dsl.html) it should enable conversion to/from JSON to POJO which according your your posted logs seem to fail.
>>
>> HTH,
>> roman
>>
>>
>>> Am 13.06.2018 um 15:10 schrieb Steve Hiller <shetc@xxxxxxxxxxxxx>:
>>>
>>> No responses -- Am I doing this completely wrong?
>>>
>>>    On Friday, June 8, 2018 6:07 PM, Steve Hiller <shetc@xxxxxxxxxxxxx> wrote:
>>>
>>>
>>> Hi All,
>>>
>>> I recently watched Claus' talk called "Developing cloud-ready Camel microservices". I am trying to do the following:
>>>
>>> rest("/candidate")
>>>   .post("applyx")
>>>   .consumes(MediaType.APPLICATION_JSON_VALUE)
>>>   .type(Candidate.class)
>>>   .to("direct:passwordlessApply")
>>> ;
>>>
>>>
>>> from("direct:passwordlessApply")
>>>   .setExchangePattern(ExchangePattern.InOnly)
>>>   .to("http4:{{service:candidate-service}}/api/candidate/applyx")
>>> ;
>>>
>>>
>>> where {{service:candidate-service}} also consumes the Candidate class.
>>>
>>> However, I am seeing the following exception:
>>>
>>> org.apache.camel.InvalidPayloadException: No body available of type: java.io.InputStream but has value: com.rusa.adapter.mobile.candidate.domain.Candidate@58af86ed...
>>> Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: com.rusa.adapter.mobile.candidate.domain.Candidate to the required type: java.io.InputStream with value com.rusa.adapter.mobile.candidate.domain.Candidate@58af86ed...
>>> Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: com.rusa.adapter.mobile.candidate.domain.Candidate to the required type: java.io.InputStream with value com.rusa.adapter.mobile.candidate.domain.Candidate@58af86ed
>>>
>>> Any help is most appreciated.
>>>
>>> Thanks,
>>>
>>> Steve
>>>
>>>
>>
>
>
>
> --
> Claus Ibsen
> -----------------
> http://davsclaus.com @davsclaus
> Camel in Action 2: https://www.manning.com/ibsen2




-- 
Claus Ibsen
-----------------
http://davsclaus.com @davsclaus
Camel in Action 2: https://www.manning.com/ibsen2