OSGI service Call using Camel route

Question

I get method not found exception when I try to connect/call OSGI service using camel route and I am not sure what logic I am missing here.

//Exception

    Caused by: org.apache.camel.RuntimeCamelException: org.apache.camel.component.bean.MethodNotFoundException: Static method with name: getGreeting not found on class: com.test.api.Hello

//The below is the blueprint that exports osgi service

    <?xml version="1.0" encoding="UTF-8"?>
    <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
      <bean id="hello" class="com.test.HelloImpl"/>
      <service ref="hello" interface="com.test.api.Hello"/>
    </blueprint>

// Below is Java Interface and I did not include the java implementation code for interface here. but FYI, all method and class are declared as public

    package com.test.api;
    public interface Hello {
     public String getGreeting();
    }

//This below timer route is in Java DSL that is called by the route builder ref in the camel context and this camel context is defined inside blueprint

   from("timer:foo?repeatCount=1")
     .bean(com.test.api.Hello.class, "getGreeting")
     .log("The message contains: ${body}")


    

I got the same exception when I tried executing this route in the same bundle where I export interface service and also I tried executing this timer route in another separate bundle by referencing the exported OSGI interface.

I am testing/executing these bundles in Red Hat Fuse server.

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Thanks!!