woshishitou commented on issue #6900:
URL: https://github.com/apache/skywalking/issues/6900#issuecomment-1001298651
>
` //
获取skywalking设置到exchange中的span实例，并使用反射获取其owner字段（该字段从父类的父类继承而来，类型为TracingContext）
Object entrySpanInstance =
exchange.getAttributes().get("SKYWALING_SPAN");
Class<?> entrySpanClazz =
entrySpanInstance.getClass().getSuperclass().getSuperclass();
Field field = entrySpanClazz.getDeclaredField("owner");
// 利用反射调用owner的getReadablePrimaryTraceId()方法，以获取traceId
field.setAccessible(true);
Object ownerInstance = field.get(entrySpanInstance);
Class<?> ownerClazz = ownerInstance.getClass();
Method getTraceId =
ownerClazz.getMethod("getReadablePrimaryTraceId");
String traceId = (String) getTraceId.invoke(ownerInstance);
`
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