[CAMEL-12086] Service call definition - Simple language expresion in uri is not being evaluated

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.20.1
• Fix Version/s: 2.20.2, 2.21.0
• Component/s: camel-core

Environment

Spring boot

• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Frantisek Sichinger
• Created: 15/Dec/17 15:25
• Updated: 21/Dec/17 16:33
• Resolved: 21/Dec/17 16:32

Description

I'm facing some problems with service call definition.

A route is supposed to send some get requests to a specific endpoint. The endpoint requires a parameter in the url path -

GET <host>:<port>/api/.../<id>

Route definition:

  routebuilder.from("direct:getSomeEntity")
	.setHeader(Exchange.HTTP_METHOD, constant(HttpMethod.GET))
	.serviceCall()
	.name("test")
	.uri("test/api/.../${fid}")
	.end()
        ...

This route did not work and the

${fid}

parameter was never resolved despite the javadoc states that the uri may contain simple language expressions

See -

https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/model/cloud/ServiceCallDefinition.java#L187

Route execution:

camelContext.createFluentProducerTemplate()
	.withHeader("fid", id)
	.to("direct:getSomeEntity")
        ...

Eventually i got it work with following workaround

.serviceCall()
	.name("test")
	.expression()		
	.simple("http4://${header.CamelServiceCallServiceHost}:${header.CamelServiceCallServicePort}/api/.../${fid}")
	.end()