Child thread cannot get traceid

[xiaohei88]

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• I had searched in the issues and found no similar issues.

Apache SkyWalking Component

Java Agent (apache/skywalking-java)

What happened

I want to get traceid in the sub thread。for example：

    final ExecutorService executorService = Executors.newFixedThreadPool(2);
    
    @RequestMapping("/test1/log")
    public String get1() {
        logger.info(Thread.currentThread().getName() + "------->" + TraceContext.traceId());
        
        executorService.submit(() -> {
            logger.info(Thread.currentThread().getName() + "------->" + TraceContext.traceId());
        });
        return "1";
    }

result:
http-nio-8090-exec-1------->Ignored_Trace
pool-8-thread-1------->N/A

What you expected to happen

http-nio-8090-exec-1------->Ignored_Trace
pool-8-thread-1------->Ignored_Trace

How to reproduce

no code

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[wu-sheng]

The simple answer is, that it should not have a trace ID. Don't submit an issue rather than a discussion randomly.

Learn more about the tracing, and manual APIs for crossing threads propagation.