Monitoring & Management

When starting the application directly, e.g. via gradle bootRun, JMX can be accessed directly via common tools such as VisualVM or jconsole (part of the JDK). The application will automatically be detected and listed.

When using the Docker image via Docker Compose, remote JMX access is enabled on port 9090. In VisualVM, choose "File" → "Add JMX connection…" and enter localhost:9090 in the "Connection" field. After a few seconds, the list entry should be replaced by the application in information. (Notice the "PID: 1". This indicates the container.)

Several endpoints are exposed via Spring Boot Actuator. The index is exposed at http://localhost:8080/actuator. Available endpoint can be discovered from here.

JMX is exposed over HTTP via Jolokia at http://localhost:8080/actuator/jolokia. For a better experience, a hawt.io interface is exposed on http://localhost:8080/actuator/hawtio.

Most settings can be changed on the fly via JMX, e.g. logging levels for debugging.