Auto Instrumentation and JaegerExporter keeps getting [WARNING] io exception and error connecting at port 4317

[stevensim226]

Hello,
I'm trying to setup OpenTelemetry w/ the javaagent automatic instrumentation on my code base using Jaeger as the export target.

I followed the steps in this documentation https://opentelemetry.io/docs/java/automatic_instrumentation/#jaeger-exporter and by that I added 3 system properties values which are

-Dotel.exporter=jaeger
-Dotel.exporter.jaeger.endpoint=localhost:14250
-Dotel.exporter.jaeger.service.name=sample-service

and also the automatic instrumentation .jar file as javaagent
4 of those settings has been set correctly

But whenever I start the app it keeps giving me this warning
[opentelemetry.auto.trace 2021-04-09 00:37:40:121 +0700] [grpc-default-executor-1] WARN io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter - Failed to export spans. Error message: UNAVAILABLE: io exception

and also at times it will also cause a Java exception which says
Connection refused: localhost/0:0:0:0:0:0:0:1:4317
despite Jaeger settings not needing port 4317 according to Jaeger's docs for OpenTelemetry https://www.jaegertracing.io/docs/1.21/opentelemetry/

Also when I test to access a function with a @WithSpan annotation, it also doesn't export the span into Jaeger correctly

Is there something that I forgot to specify? after what I found port 4317 is for OTLP/gRPC but then I'm using JaegerExporter which should be using 14250

[trask]

hi @stevensim226! sorry, we need to update those docs. in the meantime, checkout https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk-extensions/autoconfigure/README.md#jaeger-exporter for the latest settings

[stevensim226]

Hi @trask
Thanks for the information, now it's working as expected