Instrument extended open telemetry

[zeitlinger]

Fixes #14191

[zeitlinger]

I'm getting

class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 cannot be cast to class io.opentelemetry.api.incubator.ExtendedOpenTelemetry (io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 and io.opentelemetry.api.incubator.ExtendedOpenTelemetry are in unnamed module of loader 'app')
java.lang.ClassCastException: class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 cannot be cast to class io.opentelemetry.api.incubator.ExtendedOpenTelemetry (io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 and io.opentelemetry.api.incubator.ExtendedOpenTelemetry are in unnamed module of loader 'app')

@laurit can you give me a hint?

[laurit]

I'm getting

class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 cannot be cast to class io.opentelemetry.api.incubator.ExtendedOpenTelemetry (io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 and io.opentelemetry.api.incubator.ExtendedOpenTelemetry are in unnamed module of loader 'app')
java.lang.ClassCastException: class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 cannot be cast to class io.opentelemetry.api.incubator.ExtendedOpenTelemetry (io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_27.ApplicationOpenTelemetry127 and io.opentelemetry.api.incubator.ExtendedOpenTelemetry are in unnamed module of loader 'app')

@laurit can you give me a hint?

I thin you forgot to actually use the ApplicationOpenTelemetry155Incubator that you added. Have a look at

opentelemetry-java-instrumentation/instrumentation/opentelemetry-api/opentelemetry-api-1.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/opentelemetryapi/ApplicationOpenTelemetry.java

Line 22 in 39137d1

OpenTelemetry instance = getOpenTelemetry127();

[zeitlinger]

Thanks @laurit - can you check if this PR together with the SDK PR make sense (see ticket description)?

[zeitlinger]

opentelemetry-api-1.47 has this error - not sure what the problem is

    [otel.javaagent 2025-11-08 12:09:21:713 +0100] [Test worker] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - Instrumentation skipped, mismatched references were found: opentelemetry-api [class io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_56.incubator.OpenTelemetryApiIncubatorInstrumentationModule] on jdk.internal.loader.ClassLoaders$AppClassLoader@76ed5528
    [otel.javaagent 2025-11-08 12:09:21:729 +0100] [Test worker] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_56.incubator.ApplicationOpenTelemetry156Incubator:39 Missing class io.opentelemetry.api.incubator.config.ConfigProvider
    [otel.javaagent 2025-11-08 12:09:21:729 +0100] [Test worker] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_56.incubator.ApplicationOpenTelemetry156Incubator:0 Missing class io.opentelemetry.api.incubator.ExtendedOpenTelemetry
    [otel.javaagent 2025-11-08 12:09:21:729 +0100] [Test worker] WARN io.opentelemetry.javaagent.tooling.instrumentation.MuzzleMatcher - -- io.opentelemetry.javaagent.instrumentation.opentelemetryapi.v1_56.incubator.config.ApplicationDeclarativeConfigProperties156Incubator:0 Missing class io.opentelemetry.api.incubator.config.DeclarativeConfigProperties

[zeitlinger]

@laurit can you help with the error?

[zeitlinger]

@laurit can you help with the error?

I think I figured it out 😄

[laurit]

Does this really work? I'd imagine that it will return agent classes that the application code can not process. Without thinking about it too much I'm not even sure it is possible to implement this.

[zeitlinger]

right - I can't think of a use case where this is needed after the SDK has been set up. Maybe just throw a helpful exception?

[laurit]

either exception or an empty iterable, idk which would be preferable here. cc @trask