I'm able to edit org.libvirt.Domain.java and print a message when, for example suspend() is called. However I want to use eventCallback API of libvirt. Isn't this the proper piece of code to register a callback to any domain(domain parameter is null), for a lifecycle event(event id 0). conn.domainEventRegisterAny(null, 0, new VirConnectDomainEventGenericCallback() { public void eventCallback(ConnectionPointer cp, DomainPointer dp, Pointer pntr) { System.out.println("event!"); } }); I can't get the println when I suspend or resume the domains. And the reason I wrote "0" is that I could not find VIR_DOMAIN_EVENT_ID_LIFECYCLE constant in java API. Any help about where to find macros,types and enumerations in java API is appreciated. Unfortunately I can not find anything about events in javadoc neither. Any comments? Kind regards Kadir