Read slf4j property values using java class

Question

how to read below slf4j property values using java class

<Appenders>
        <Console name="Console-Appender" target="SYSTEM_OUT">
            <PatternLayout>
                <pattern>
                    [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] [%X{id}] Management: [%X{apiName}] trace_id=%X{trace_id} [%X{user}] %c{1} - %msg%n
                </pattern>
            </PatternLayout>
        </Console>

I tried using the below but its won't work

  public String sample(){
        String val = ThreadContext.get("trace_id");
        System.out.println("val" + val);
        return "sample";
    }

what i need is print trace_id using system out