How to Customize Transaction Name with OpenTelemetry Java Agent

[Raushan-Sapiens]

Hi everyone,

I’m using the OpenTelemetry Java agent for instrumentation and I’m trying to customize the transaction names for my spans. Currently, the transaction name is displayed as 'GET /app-web/*.do', but I need it to be more specific, like 'GET /app-web/manager/order.do?subActionName=createOrder'.

Here is an example of the log output I’m seeing:

io.opentelemetry.exporter.logging.LoggingSpanExporter - 'GET /app-web/*.do' : b78cca24e409fd234a31d86002028c20 68e1f45d02fe2184 
SERVER [tracer: io.opentelemetry.undertow-1.4:2.7.0-alpha] AttributesMap{data={url.scheme=https, thread.name=default I/O-2, network.peer.port=44822, 
network.protocol.version=1.1, user_agent.original=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 
Chrome/130.0.0.0 Safari/537.36, http.response.status_code=200, thread.id=114, http.request.method=GET, http.route=/app-web/*.do,
 server.address=app.com, client.address=1.1.1.1, network.peer.address=12.12.12.12, 
 url.query=param1=xyz&subActionName=createOrder&isServerAsyncMode=false, url.path=/app-web/manager/order.do}, capacity=128, totalAddedValues=14}

How can I customize the transaction name to include the full path and query parameters?
Is there a way to dynamically set the span name based on the request details using the OpenTelemetry Java agent?
Are there any examples or best practices for achieving this?
Any help or guidance would be greatly appreciated!

Thanks in advance!

[Raushan-Sapiens]

I tried adding

public class DynamicSpanProcessor implements SpanProcessor {
@OverRide
public void onStart(Context parentContext, ReadWriteSpan span) {
String path = span.getAttribute(AttributeKey.stringKey("http.route"));
String query = span.getAttribute(AttributeKey.stringKey("http.query"));
String dynamicName = "GET " + path + (query != null ? "?" + query : "");
span.updateName(dynamicName);
}

and initialized while starting server

DynamicSpanProcessor dynamicSpanProcessor = new DynamicSpanProcessor();
SdkTracerProvider tracerProvider = SdkTracerProvider.builder()
.addSpanProcessor(dynamicSpanProcessor)
.build();
GlobalOpenTelemetry.set(OpenTelemetrySdk.builder().setTracerProvider(tracerProvider).build());

But, onStart is not getting invoked