How can I get traceId except use MDC in log when use auto instrumentation

[jack161641]

How do I get the traceid because I want to put it in the return message body with the traceid when use auto instrumentation
I try use MDC.get("span_id"),but I get null value,But I can see traceId in the log

[anuraaga]

Hi @jack161641 - you should be able to use Span.current().getSpanContext().getTraceId(). If you haven't already, you will need to add io.opentelemetry:opentelemetry-api as a dependency to your project.

[jack161641]

@anuraaga Thanks