How to access a Tracer about java-spring-cloud

[pavolloffay]

As you mentioned the preferred way in spring is to inject via spring context.

All good instrumentations should support passing a tracer instance as object and not relay only on GlobalTracer.

[pavolloffay]

I would like to keep the lib as simple as possible if there will be a request to bind the tracer to GlobalTracer then we could re-review and see what is necessary to make it work properly.

[objectiser]

Ok sounds reasonable - and also simplifies things for now.

So I don't think the current TracerAutoConfiguration needs to change to reference the GlobalTracer - as essentially with the spring ecosystem we are not going to use the GlobalTracer. So this auto-config is providing the fallback to obtain a tracer if no other bean has been provided.

It might be a good idea for this auto-config to be moved into the java-spring-cloud repo, independent of spring-web, as it is applicable to all spring instrumentations.

[pavolloffay]

fixed via opentracing-contrib/java-spring-web#30