WS-Discovery is a protocol to enable dynamic discovery of services available on the local network. By default, WS-Discovery uses a UDP based multicast transport to announce new services and probe for existing services. However, it also supports a managed mode where a discovery proxy is used to reduce the amount of multicast traffic required.
Enabling WS-Discovery announcements for services
To enable CXF to send "Hello" announcements when services and endpoint are started, the cxf-services-ws-discovery-service and cxf-services-ws-discovery-api jars need to be available on the classpath. The cxf-services-ws-discovery-service jar will register a ServerLifecyleListener that will automatically publish the "Hello" messages. It will also respond to any Probe requests that match the services it has published.
By default, the WS-Discovery service will startup in ad-hoc mode. However, if you set a Bus property of "org.apache.cxf.service.ws-discovery.address" to a URL address of a WS-Discovery Proxy, the service will change to managed mode and send the Hello/Bye notices directly to that proxy. It will also not respond to Probes.
Using WS-Discovery client to probe for services
CXF also provides an API to probe the network or WS-Discovery proxy. The org.apache.cxf.ws.discovery.WSDiscoveryClient class provides several methods for probing the network.