Since 6.6.0, SkyWalking cancelled the local span and exit span register. If old java agent(before 6.6.0) is still running, and do register to 6.6.0+ backend, you will face the following warning message.
class=RegisterServiceHandler, message = Unexpected endpoint register, endpoint isn't detected from server side.
This will not harm the backend or cause any issue. This is a reminder that, your agent or other client should follow the new protocol requirements.
You could simply use log4j2.xml
to filter this warning message out.