spring-boot-otel-baggage-demo

Spring boot demo project to show an issue related with OpenTelemetry baggage not being passed from a Filter to a Controller when using Undertow as an application server.

See issue at Github: Baggage is lost between Filter and Controller when using Spring-Boot with Undertow #10323

POM file already has the jvmArguments to run the OpenTelemetry Java Agent (2.0.0 version), which is included in the opentelemetry directory.

Run Locally

Go to the project root folder and run:

./mvnw spring-boot:run

Perform an http request

curl http://localhost:9091

Check the logs to confirm the empty Baggage reaching the controller with this log entry Controller Baggage: {}

2024-01-25 10:26:20.036  INFO 16536 --- [  XNIO-1 task-1] c.g.r.springboot.otelbaggage.DemoFilter  : ### DemoFilter start ###
2024-01-25 10:26:20.057  INFO 16536 --- [  XNIO-1 task-1] c.g.r.springboot.otelbaggage.DemoFilter  : Baggage inside DemoFilter try-with-resources: {otel.baggage.demo.key=this-is-a-value}
2024-01-25 10:26:20.074  INFO 16536 --- [  XNIO-1 task-1] c.g.r.s.otelbaggage.DemoController       : ### DemoController start ###
2024-01-25 10:26:20.074  INFO 16536 --- [  XNIO-1 task-1] c.g.r.s.otelbaggage.DemoController       : Controller Baggage: {}
2024-01-25 10:26:20.074  INFO 16536 --- [  XNIO-1 task-1] c.g.r.s.otelbaggage.DemoController       : ### DemoController end ###
[otel.javaagent 2024-01-25 10:26:20:108 +0000] [XNIO-1 task-1] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - 'GET /' : d9318e820db4c8e3016077348a6dd3cc 793bf5be17149746 SERVER [tracer: io.opentelemetry.undertow-1.4:2.0.0-alpha] AttributesMap{data={http.route=/, http.request.method=GET, network.peer.port=21643, url.path=/, server.address=localhost, network.peer.address=0:0:0:0:0:0:0:1, network.protocol.version=1.1, http.response.status_code=200, thread.id=22, server.port=9091, user_agent.original=curl/7.65.0, url.scheme=http, thread.name=XNIO-1 I/O-5}, capacity=128, totalAddedValues=13}
2024-01-25 10:26:20.109  INFO 16536 --- [  XNIO-1 task-1] c.g.r.springboot.otelbaggage.DemoFilter  : Baggage inside DemoFilter try-with-resources after 'filterChain.doFilter': {otel.baggage.demo.key=this-is-a-value}
2024-01-25 10:26:20.109  INFO 16536 --- [  XNIO-1 task-1] c.g.r.springboot.otelbaggage.DemoFilter  : ### DemoFilter end ###
2024-01-25 10:26:39.158  INFO 16536 --- [ionShutdownHook] io.undertow                              : stopping server: Undertow - 2.2.28.Final
2024-01-25 10:26:39.161  INFO 16536 --- [ionShutdownHook] io.undertow.servlet                      : Destroying Spring FrameworkServlet 'dispatcherServlet'