How to put traceId in MDC

[prefersimple]

I want to print traceId in my log. I try to put traceId in MDC, then write %X{traceId} in logback.xml! How can I do it?

[lichenglin]

I think we can add new rules for "logback" ,"log4j","log4j2"

[Duncan-tree-zhou]

if you want to get the traceid in a running thread, maybe you can use the following code to get the trace id.

        if(!GlobalTracer.isRegistered() || null == GlobalTracer.get().scopeManager().activeSpan()) {
            // tracing is not activated
            log.debug(String.format("tracing is not activated here."));
        } else {
            // tracing is activated
            String traceId = GlobalTracer.get().scopeManager().activeSpan().context().toTraceId();
            log.debug(String.format("trace id is %s", traceId));
        }

[prefersimple]

if you want to get the traceid in a running thread, maybe you can use the following code to get the trace id.

        if(!GlobalTracer.isRegistered() || null == GlobalTracer.get().scopeManager().activeSpan()) {
            // tracing is not activated
            log.debug(String.format("tracing is not activated here."));
        } else {
            // tracing is activated
            String traceId = GlobalTracer.get().scopeManager().activeSpan().context().toTraceId();
            log.debug(String.format("trace id is %s", traceId));
        }

Thanks for your reply! I want to place this code in some rules without writing extra code.

[prefersimple]

I think we can add new rules for "logback" ,"log4j","log4j2"

It is a good idea for my requirements.