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Why header value isn't inserted into Apache Camel's `to` url parameter of the route in Spring DSL?

We have a route that will accept the kafka.KEY and use that as mqtt url parameter to send the data to the right topic.
<routes
xmlns="http://camel.apache.org/schema/spring">
<route id="KafkaToMQTT">
<from uri="kafka://mqtt?brokers=localhost:9092"/>
<to uri="micrometer:timer:camel.proxy.kafka.mqtt.stream?action=start"/>
<log message="Headers ${header.kafka.KEY}"/>
<to uri="mqtt:mqtt?host=tcp://localhost:1883&publishTopicName=try${header.kafka.KEY}"/>
<to uri="log://camel.proxy?groupInterval=3&level=INFO"/>
<to uri="micrometer:timer:camel.proxy.kafka.mqtt.stream?action=stop"/>
</route>
</routes>
In the log messages I see the ${header.kafka.KEY} correctly, while in the mqtt I'm getting the topic as literally try${header.kafka.KEY}
What is the reason for that, how to make the header to be used there?

To avoid that the right element instead of to should be used, that is toD.
toD concatenates the url correctly, so the right route XML is:
<routes
xmlns="http://camel.apache.org/schema/spring">
<route id="KafkaToMQTT">
<from uri="kafka://mqtt?brokers=localhost:9092"/>
<to uri="micrometer:timer:camel.proxy.kafka.mqtt.stream?action=start"/>
<log message="Headers ${header.kafka.KEY}"/>
<toD uri="mqtt:mqtt?host=tcp://localhost:1883&publishTopicName=ESP_02/try${header.kafka.KEY}"/>
<to uri="log://camel.proxy?groupInterval=3&level=INFO"/>
<to uri="micrometer:timer:camel.proxy.kafka.mqtt.stream?action=stop"/>
</route>
</routes>

How can i get the route from blueprint xml file

I have some problem. I need to take the route or all CamelContext from blueprint file. How can i did it?
route.xml
I have tried to add route via RouteDefinitions but it throws exceptions because it expected spring namespace but i use blueprint namespace. I use cxf as implementation of JAX-RS. There is another way how to do it better.
xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">
<bean id="weatherMailService" class="com.test.mail.MailSenderImpl"/>
<service ref="weatherMailService" interface="com.test.mail.MailSender"/>
<bean id="serviceProcessor" class="com.test.mail.MailSenderImpl"/>
<bean id="context" class="com.test.mail.MailSenderImpl"></bean>
<camelContext id="ctx" xmlns="http://camel.apache.org/schema/blueprint">
<route id="mail">
<from uri="direct:start"/>
<setBody>
<constant>Test</constant>
</setBody>
<setHeader headerName="subject">
<simple>Weather</simple>
</setHeader>
<process ref="serviceProcessor"/>
<to uri="smtps://smtp.gmail.com:465?username=RAW(*****#gmail.com)&password=******&to=******#gmail.com"/>
<to uri="log:start"/>
<process ref="context"></process>
</route>
</camelContext>
I would like to get CamelContext in java code. How can i did it? Thank you

Accessing member of java pojo set as exchange property in the camel spring route

I have written my route using spring xml which looks like this
<camelContext xmlns="http://camel.apache.org/schema/spring">
<propertyPlaceholder id="properties" location="classpath:props.properties" />
<route>
<from
uri="activemq:queue:adapter.queue?mapJmsMessage=false&disableReplyTo=true" />
<log message="This is a status request"></log>
<process ref="psuedoRoute"></process>
</route>
</camelContext>
As I am getting a Java POJO through my activemq end point, and that is the exchange body. Is it possible to read the value of a string member within this route xml itself?

Yes, its possible. You may use SPEL, it allows to call a method of Java object, getter in your case.
It could be like:
<camelContext xmlns="http://camel.apache.org/schema/spring">
<propertyPlaceholder id="properties" location="classpath:props.properties" />
<route>
<from
uri="activemq:queue:adapter.queue?mapJmsMessage=false&disableReplyTo=true" />
<log message="This is a status request"></log>
<process ref="psuedoRoute"></process>
<log message="This is a status request"></log>
<setBody>
<spel>#{body.getValue()}</spel>
</setBody>
</route>
</camelContext>

Apache Camel routing

A short question about Apache Camel.
I have the following scenario, where my server receives jms messages and then transform to csv file and then insert DB.
For this purpose i have 2 beans:
xml2csv
insertDB
I use routing like:
<route id="route1" errorHandlerRef="myErrorHandler">
<from uri="file://{someFolder1}}
?...
<to uri="bean:xml2csv" />
<log message="transformed to xml file" />
</route>
<route id="route2" errorHandlerRef="myErrorHandler">
<from uri="file://{{someFolder2}}
?...
<to uri="direct:csvOnboardingChannel" />
</route>
<route id="csvOnboarding" errorHandlerRef="myErrorHandler">
<from uri="direct:csvOnboardingChannel" />
<to uri="bean:insertDB" />
</route>
When "route" a file from-to, is it move like a message? or putting the question different, does Apache Camel take a file, wrap it as a message and route it to a bean or a component?
Do I understand it correct or am in a wrong directation.

Yes, your understanding is correct. Camel reads in the file's data and sends it as a message through the route to a bean. Might also be simpler as a single route, like so:
<route id="route1" errorHandlerRef="myErrorHandler">
<from uri="file://{someFolder1}}">
<to uri="bean:xml2csv" />
<to uri="bean:insertDB" />
</route>

Apache Camel: Spring WS SOAP Operation did not match

I am trying to create a Spring WS consumer like this:
<route>
<from uri="direct:start"/>
<to uri="spring-ws:rootqname:http://{ip}:{port}/PORTAL/webservices/A20?soapAction=acceptMessage"/>
<to uri="log:output"/>
</route>
Error:
SOAPAction http://{ip}:{port}/PORTAL/webservices/A20/acceptMessage does not match an operation

In your property placeholders you need to use double braces like so:
<route>
<from uri="direct:start"/>
<to uri="spring-ws:rootqname:http://{{ip}}:{{port}}/PORTAL/webservices/A20?soapAction=acceptMessage"/>
<to uri="log:output"/>
</route>
More info here: http://camel.apache.org/using-propertyplaceholder.html