How to handle errors after sending request(camel-http)?

Question

I want to handle errors depending on the http code response.

I would also like to know how to enable *throwExceptionOnFailure* on my route. For example, if the response code is 500x, send the message to the queue "redmine_errors"

UPDATE 4:

my blueprint after add exception from answer @fg78nc (don't work)

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
        http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
        http://cxf.apache.org/blueprint/jaxws http://cxf.apache.org/schemas/blueprint/jaxws.xsd
        http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd
       ">

<bean id="tfsToRedmineMapper"
    class="com.stackabuse.example.TfsToRedmineMapper" />

<bean id="myBean" class="com.stackabuse.example.MyBean" />

<camelContext
    xmlns="http://camel.apache.org/schema/blueprint">

<onException>
    <exception>org.apache.camel.http.common.HttpOperationFailedException
    </exception>
    <onWhen>
        <method ref="myBean" method="parseException" />
    </onWhen>
    <handled>
        <constant>true</constant>
    </handled>
    <to uri="log:redmine_errors" />
</onException>
    <route>
        <from uri="jetty:http://0.0.0.0:8082/test" />
        <inOnly uri="activemq://from_tfs" />
    </route>
    <route>
        <from uri="activemq://from_tfs" />
        <process ref="tfsToRedmineMapper" />
        <to uri="activemq://for_redmine" />
    </route>
    <route>
        <from uri="activemq://for_redmine" />
        <setHeader headerName="Content-Type">
            <constant>application/json; charset=utf-8</constant>
        </setHeader>
        <setHeader headerName="X-Redmine-API-Key">
            <constant>my_redmine_api_token</constant>
        </setHeader>
        <toD uri="${header.url}" />
    </route>

ERROR: 2019-02-15 09:35:12,103 | ERROR | mix-7.0.1/deploy | BlueprintCamelContext | 40 - org.apache.camel.camel-blueprint - 2.16.5 | Error occurred during starting Camel: CamelContext(camel-32) due Failed to create route route48 at: >>> OnException[null When[bean{} -> []] -> [To[activemq://redmine_errors]]] <<< in route: Route(route48)[[From[jetty:http://0.0.0.0:8082/test]] -> [On... because of org.apache.camel.http.common.HttpOperationFailedException org.apache.camel.FailedToCreateRouteException: Failed to create route route48 at: >>> OnException[null When[bean{} -> []] -> [To[activemq://redmine_errors]]] <<< in route: Route(route48)[[From[jetty:http://0.0.0.0:8082/test]] -> [On... because of org.apache.camel.http.common.HttpOperationFailedException

enter image description here

You should be able to append ?throwExceptionOnFailure=false to the end of the URI to invoke. This will prevent Camel from throwing an exception but instead you can check the response code in the header via .when(header(Exchange.HTTP_RESPONSE_CODE)).isGreaterThanOrEqualTo(400))... The actual response body will be available in the in-message body — Roman Vottner
– Roman Vottner, Commented Feb 12, 2019 at 12:55
You should move onException outside of the route, i.e. keep it on the CamelContext level, not the route level, so it will apply to all routes. — fg78nc
– fg78nc, Commented Feb 12, 2019 at 23:54
I did as you said, but now I get errors: org.osgi.service.blueprint.container.ComponentDefinitionException: Unable to validate xml ... Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'onException'. One of '{"http://camel.apache.org/schema/blueprint":route}' is expected. — D. Batmanov
– D. Batmanov, Commented Feb 13, 2019 at 7:45

fg78nc · Accepted Answer · 2019-02-13 19:19:34Z

1

Unfortunately, Camel does not set correctly Http status code. Solution below is a little bit convoluted, but it works. It can also be solved within XML with the simple language predicate, but somehow it did not work for me, so I used Java for predicate.

Blueprint :

 <bean id="myBean" class="com.example.MyBean" />

 <onException>
     <exception>org.apache.camel.http.common.HttpOperationFailedException</exception>
      <onWhen>
         <method ref="myBean" method="parseException" />
      </onWhen>
      <handled>
         <constant>true</constant>
      </handled>
      <to uri="jms:redmine_errors"/>
 </onException>

Java :

       package com.example;

       public class MyBean {

       public boolean parseException(Exchange exchange){
              return exchange.getProperty("CamelExceptionCaught")
                             .toString().contains("statusCode: 500");
            }
       }

edited Feb 13, 2019 at 19:19

answered Feb 11, 2019 at 13:07

fg78nc

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13 Comments

D. Batmanov Over a year ago

2019-02-12 09:41:36,704 | ERROR | mix-7.0.1/deploy | BlueprintCamelContext | 40 - org.apache.camel.camel-blueprint - 2.16.5 | Error occurred during starting Camel: CamelContext(camel-40) due Failed to create route route117 at: >>> OnException[null When[simple{${header.CamelHttpResponseCode} == 500} -> [To[jms:redmine_errors]]] -> []] <<< in route: Route(route117)[[From[activemq://for_redmine]] -> [OnExcepti... because of org.apache.camel.http.common.HttpOperationFailedException

fg78nc Over a year ago

@D.Batmanov I have updated my answer, please check if it works for you. It did for me.

D. Batmanov Over a year ago

if I add onException block i have error(bundle does not start): Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'onException'. One of '{"camel.apache.org/schema/blueprint":route}' is expected. I will add my full blueprint above( my development machine is intranet(maybe this is important?))

fg78nc Over a year ago

Did you add it within CamelContext element, but outside of route element?

fg78nc Over a year ago

Please put onException block above route blocks.

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