RMI instrumentation not working when using Spring Boot starter?

[foobert]

I'm trying to get RMI instrumentation working but cannot figure out how to make it work with the Spring Boot starter variant.

My demo project does a simple RMI call within a Spring Web REST controller.

When using the java agent, I get two nice spans:

[otel.javaagent ...] [http-nio-8080-exec-1] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - '...' : 6028710b4ab16690391b924fcdcc3310 d821cee5a24c4f18 CLIENT [tracer: io.opentelemetry.rmi:2.15.0-alpha] AttributesMap{data={thread.id=40, rpc.system=java_rmi, thread.name=http-nio-8080-exec-1, rpc.method=..., rpc.service=...}, capacity=128, totalAddedValues=5}
[otel.javaagent 2025-05-08 08:13:14:974 +0200] [http-nio-8080-exec-1] INFO io.opentelemetry.exporter.logging.LoggingSpanExporter - 'GET /hello' : 6028710b4ab16690391b924fcdcc3310 64032397bcb08c4b SERVER [tracer: io.opentelemetry.tomcat-10.0:2.15.0-alpha] AttributesMap{data={http.response.status_code=200, thread.id=40, server.port=8080, url.path=/hello, server.address=localhost, client.address=0:0:0:0:0:0:0:1, network.peer.address=0:0:0:0:0:0:0:1, http.route=/hello, http.request.method=GET, network.peer.port=53354, url.scheme=http, thread.name=http-nio-8080-exec-1, user_agent.original=..., network.protocol.version=1.1}, capacity=128, totalAddedValues=14}

But when using the Spring Boot integration, there's only one span for the REST controller:

...  INFO 64276 --- [demo3] [nio-8080-exec-1] i.o.e.logging.LoggingSpanExporter        : 'GET /hello' : 084171a94c25855aa6a8b714cdb37140 e46894cfbcb729aa SERVER [tracer: io.opentelemetry.spring-webmvc-6.0:2.15.0-alpha] AttributesMap{data={network.protocol.version=1.1, http.route=/hello, http.request.method=GET, url.path=/hello, server.address=localhost, client.address=0:0:0:0:0:0:0:1, user_agent.original=..., network.peer.address=0:0:0:0:0:0:0:1, url.scheme=http, http.response.status_code=200, server.port=8080, network.peer.port=53235}, capacity=128, totalAddedValues=12}

The documentation states that using the Java agent is the default option but I can't find any information that RMI instrumentation wouldn't be supported when using the Spring integration. What am I missing?

[laurit]

Spring starter does not support RMI instrumentation.

[foobert]

Thank you for the quick reply!