nothing is obvious as to why its not working, has this been working for you before ?

Once I tried to deploy a very simple war from https://tomcat.apache.org/tomcat-7.0-doc/appdev/sample/. After liberty restarted, the application can be accessed while javametric dashboard has data.

@tobespc If you prefer to reproduce it in your own environment, here is the configuration step.

1. From 9.42.19.137 (root/zhu88jie), download /root/zjingjbj/simplejavatest/defaultServer.tar.gz. Copy the defaultServer.tar.gz under your liberty's directory /opt/ibm/wlp/usr/servers, and uncompress it. So there will be /opt/ibm/wlp/usr/servers/defaultServer.
2. Restart your liberty server defaultServer

FYI. I've put javametrics under /opt/ibm/wlp/usr/servers/defaultServer/agent.

@tobespc Toby, I've monitor the application through wireshark and found that when such issue happens, agent doesn't return any data to dashboard through WebSocket. Do you have any idea?

HI @zjingjbj, I've just stumbled on this issue so sorry for resurrecting it :-) I've seen something like this happen when Liberty does not have the websocket feature installed, perhaps that was the issue?

@mattcolegate Actually websocket-1.1 is installed. If there is any log to check why there is no data shown in dashboard?

@zjingjbj There's the console log in the browser (for example, in Firefox right click the dashboard, select Inspect Element and then click the Console tab, look for any errors), the Liberty console.log should also show "Application javametrics-dash-1.X.0 started" and the Liberty messages.log should show messages like the following:

[28/02/20 10:51:26:338 GMT] 00000033 com.ibm.ws.webcontainer.osgi.webapp.WebGroup                 I SRVE0169I: Loading Web Module: javametrics.web.
[28/02/20 10:51:26:338 GMT] 00000033 com.ibm.ws.webcontainer                                      I SRVE0250I: Web Module javametrics.web has been bound to default_host.
[28/02/20 10:51:26:339 GMT] 00000033 com.ibm.ws.http.internal.VirtualHostImpl                     A CWWKT0016I: Web application available (default_host): http://host.docker.internal:9080/javametrics-dash/
[28/02/20 10:51:26:340 GMT] 00000033 com.ibm.ws.app.manager.AppMessageHelper                      A CWWKZ0001I: Application javametrics-dash-1.7.0 started in 1.678 seconds.
[28/02/20 10:51:26:386 GMT] 0000003a com.ibm.ws.session.WASSessionCore                            I SESN0176I: A new session context will be created for application key default_host/javametrics-dash
[28/02/20 10:51:26:386 GMT] 0000003a com.ibm.ws.util                                              I SESN0172I: The session manager is using the Java default SecureRandom implementation for session ID generation.
[28/02/20 10:51:26:397 GMT] 0000003a com.ibm.ws.wsoc.EndpointManager                              I CWWKH0046I: Adding a WebSocket ServerEndpoint with the following URI: /javametrics-socket