[CAMEL-9656] Using SpringBoot HealthEndpoint bean throws AmbiguousMethodCallException

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.16.2
• Fix Version/s: 2.16.3, 2.17.1, 2.18.0
• Component/s: camel-spring-boot
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Colin Harms
• Created: 29/Feb/16 16:26
• Updated: 22/Mar/16 09:53
• Resolved: 22/Mar/16 09:53

Description

I'm trying to re-use the Springboot Actuator HealthEndpoint and InfoEndpoint beans and exposing them via rest:

@Autowired
HealthEndpoint healthEndpoint;
...
//build the route
from("rest:get:health").routeId("REST-healthcheck").bean(healthEndpoint, "invoke");

However when that gets invoked, it throws a AmbiguousMethodCallException and its other candidate for "invoke()" is on the abstract class that HealthEndpoint is extending

It looks like the issue is here:
https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/component/bean/BeanInfo.java#L1020

In this case HealthEndpoint extends AbstractHealthEndpoint, which is abstract, but invoke() is declared on the Endpoint interface. So this logic:

 !isFromInterface && Modifier.isAbstract(info.getMethod().getModifiers()) 

Will not evaluate to true, and the abstract method will remain a candidate.

Here are the sources for the Endpoint/HealthEndpoint/AbstractEndpoint classes:

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/Endpoint.java#L56

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/AbstractEndpoint.java#L32

https://github.com/spring-projects/spring-boot/blob/master/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/HealthEndpoint.java#L36

It seems this is intentional, due to the "if the class is an interface then keep the method" comment in BeanInfo.
I'm curious as to why that is.

Issue Links

• relates to: CAMEL-9690 bean parameter binding should check parameter types when using simple expressions