I believe your issue is related to packages. Your application is defined in com.organization_name.webservices.application. I am guessing your other classes are in a different package that is not a child of com.organization_name.webservices.application. Spring will automatically load controllers that are in the same package or sub-packages, for example:
com.organization_name.webservices.application
com.organization_name.webservices.application.controllers
But not packages like this:
com.organization_name.webservices.controllers
You can fix this by either moving your controller (or application), or adding ComponentScan to your Application:
@SpringBootApplication
@ComponentScan(basePackageClasses=GreetingController.class)
public class Application {
You should be seeing this in your log:
Mapped "{[/greeting]}" onto public com.organization_name.webservices.xxx.Greeting com.organization_name.webservices.xxx.GreetingController.greeting(java.lang.String)