Can propagation of traceId be guaranteed by using only Skywalking java agent?

[mark8s]

Hello everyone, I have a question.

I would like to know if it is possible to create and propagate traceID using just skywalking-java-agent(https://github.com/apache/skywalking-java). For example: When I have two services, service A and service B, service A will call service B. When accessing service A, will A->B generate the same traceId?

I tested it and found that the traceIDs generated by service A and service B are different. Is it a configuration problem or skywalking-java-agent simply cannot meet such a requirement. Is there any way to ensure the propagation of traceID without invading the code?

service A logs：

2023-10-09 14:54:55.921  INFO  59588 **[TID:42b47d08737c49fdbead117466640329.58.16968344958490001]**  --- [nio-8080-exec-1] c.m.s.controller.HelloController         : Get a request .....
2023-10-09 14:54:55.921  INFO  59588 **[TID:42b47d08737c49fdbead117466640329.58.16968344958490001]**  --- [nio-8080-exec-1] c.m.s.controller.HelloController         : The param is xx
2023-10-09 14:54:55.921  INFO  59588 **[TID:42b47d08737c49fdbead117466640329.58.16968344958490001]**  --- [nio-8080-exec-1] c.m.s.controller.HelloController         : Call callback .....
2023-10-09 14:54:56.147  INFO  59588 [TID:42b47d08737c49fdbead117466640329.58.16968344958490001]  --- [nio-8080-exec-1] c.m.s.controller.HelloController         : Service Callback resp: service callback get a request.

service B logs：

2023-10-09 14:54:56.067  INFO  60832 **[TID:0730b9201f3244c8b2f537430882ac2b.58.16968344960530001]**  --- [nio-8081-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-10-09 14:54:56.069  INFO  60832 **[TID:0730b9201f3244c8b2f537430882ac2b.58.16968344960530001]**  --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2023-10-09 14:54:56.069  INFO  60832 [TID:0730b9201f3244c8b2f537430882ac2b.58.16968344960530001]  --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 0 ms
2023-10-09 14:54:56.114  INFO  60832 **[TID:0730b9201f3244c8b2f537430882ac2b.58.16968344960530001]**  --- [nio-8081-exec-1] c.e.j.controller.CallbackController      : Get a request .....

TID is different .

Can anyone help me answer this? Thanks

[wu-sheng]

To keep propagating the context(not just the trace ID), you need to see whether your RPC framework is supported. https://skywalking.apache.org/docs/skywalking-java/v9.0.0/en/setup/service-agent/java-agent/supported-list/. Or further on the optional page and activated manually.

[mark8s]

Thanks for the reply~
In other words, this also has something to do with the way of requesting?
Maybe the way I asked is wrong?

RestTemplate restTemplate=new RestTemplate();
Map<String,String> params=new HashMap<>();
ResponseEntity<String> responseEntity=restTemplate.getForEntity("http://localhost:8081/callback",String.class,params);

[wu-sheng]

Do you follow the document? Have you made sure the agent with the config file and plugins are all in the right place?

In your logs, there is nothing related to the trace ID. How do you know they are different? From UI?

[mark8s]

TID is traceID ......

[wu-sheng]

If you want to verify trace context propagation, for your case, check the key=sw8 header in your HTTP request. If there is nothing in it, you agent doesn't install correctly.

[mark8s]

ok, thank you