Use JDK http client (opentelemetry-exporter-sender-jdk) with Java agent

[marco-farinetti-evooq]

Hi all,

We're using Opentelemetry in our application with an extended java agent. The extension is built as described here build.gradle
The actual issue we're facing is with proxy authentication, the same as described here open-telemetry/opentelemetry-java#6819. Since this is not yet supported and with Okhttp we can't just set the Proxy-Authorization header, we thought we could get around it by using the JDK http client.

We tried configuring it in the extension:

    compileOnly("io.opentelemetry:opentelemetry-exporter-sender-jdk")
    compileOnly("io.opentelemetry:opentelemetry-exporter-otlp") {
        exclude(group = "io.opentelemetry", module = "opentelemetry-exporter-sender-okhttp")
    }

but this doesn't affect the java agent jar, which seems to include only the Okhttp sender.

As a last resort (which is really not ideal), we tried forking the instrumentation repo and added the jdk sender to the java agent tooling referring to open-telemetry/opentelemetry-java#5703

  implementation("io.opentelemetry:opentelemetry-exporter-otlp") {
    exclude(group = "io.opentelemetry", module = "opentelemetry-exporter-sender-okhttp")
  }
  implementation("io.opentelemetry:opentelemetry-exporter-sender-jdk")

I believe we're still missing something as when running the application it's still using the Okhttp client:

[otel.javaagent 2025-02-27 16:51:50:774 +0100] [OkHttp https://target-url/...] ERROR io.opentelemetry.exporter.internal.http.HttpExporter - Failed to export metrics. The request could not be executed. Full error message: Failed to authenticate with proxy
java.io.IOException: Failed to authenticate with proxy
	at okhttp3.internal.connection.RealConnection.createTunnel(RealConnection.kt:476)
	...
	Suppressed: java.io.IOException: Failed to authenticate with proxy
		... 22 more

Do you have any suggestion? Thank you.

Sorry for the duplicate open-telemetry/opentelemetry-java#7164 - wasn't sure where it would be best to post