[JAVA] I want to embed any TraceId in the log

Summary of this article

――In batch processing, I want to quickly search where the same processing log is from when parallel processing or continuous processing is performed. -Write on the assumption that @ Slf4j is used

Immediate mounting method

--In Java class, register the information you want to output to the log using MDC (MDC.put) --At the end, remove the key with remove --You can get the key registered in MDC in logback.xml in the format of % X {<key>}.


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE logback>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
            <pattern>traceID: [%X{traceId}] message: %msg%n</pattern>

        <appender-ref ref="STDOUT" />
import java.util.UUID;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.MDC;

public class Traceid {
    public static void main(String[] args) {

        String uuid = UUID.randomUUID().toString();
        MDC.put("traceId", uuid.substring(0, uuid.indexOf("-")));


Console log

traceID: [] message: dummy1
traceID: [4f9c9243] message: dummy2
traceID: [] message: dummy3


Since MDC.put is a static method, why not use the same value when using it in multiple threads? → Since the Map where MDC stores the key is stored in ThreadLocal, there is no need to worry about using the same value between threads!

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