Backend calls not being traced

Elastic Observability
1

I am using the 1.42 java agent with java 11.

Some of my backend calls are not being traced. I have multiple backends that I use Apache HttpClient 4.5 with. Some are traced and some are not. I took thread dumps and there is a small difference that I don't understand.

This is being traced:

	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
my code here

This is not being traced:

	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
	at org.springframework.ws.transport.http.HttpComponentsConnection.onSendAfterWrite(HttpComponentsConnection.java:121)

The odd difference is that the non-working code (not traced by Elastic APM) has that frame for CloseableHttpClient:55. Unless I'm looking at the wrong source, line 55 is the @ThreadSafe annotation on the class. Everything above CloseableHttpClient.java:107 in both stacks is identical.

Any idea what's going on?

thanks

2

FWIW, I think the CloseableHttpClient line 55 frame is a red herring. I looked at more thread dumps and see this frame in some backend calls that are showing up in the dependencies list.

I also increased the sampling rate to 1 but don't see any in what backend are being traced.