[CAMEL-21315] Throw an exception or add a warning when multiple ToDefinitions are defined in Rest DSL

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.8.0
• Fix Version/s: 4.9.0
• Component/s: camel-core, rest
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Shawn Fu
• Created: 03/Oct/24 19:54
• Updated: 07/Oct/24 10:18
• Resolved: 07/Oct/24 10:18

Description

Most of the route builder configurations allow multiple ToDefinitions, e.g.:

from("direct:start")
    .process(e -> {})
    .to("micrometer:timer:timer-a")
    .to("direct:to-route-1)
    .to("micrometer:timer:timer-b")
    .to("direct:to-route-2) 

But the Rest DSL only supports the last defined "to" component, any other "to" components are overwritten silently by Camel.

Is it possible to add a mechanism in the Rest component to let the user know only the last "to" will be in use? Like in the org.apache.camel.model.rest.VerbDefinition#setTo method can an Assert being added to make sure this.to is null before the assignment?