A full getting started guide can be found on the ARI4Java Wiki
    // create instance
    ARI ari = ARI.build("http://192.168.56.44:8088/", "test-app", "ari4java", "yothere", AriVersion.IM_FEELING_LUCKY);
    // get info
    AsteriskInfo info = ari.asterisk().getInfo().execute();
    // get event websocket
    ari.events().eventWebsocket("test-app").execute(new AriWSCallback<Message<() {new AriWSCallback<List<Channel>>() {
        @Override
        public void onSuccess(List<Channel> result) {
            // code to handle the result ...
        }
        @Override
        public void onFailure(RestException e) {
            e.printStackTrace();
        }
        @Override
        public void onConnectionEvent(AriConnectionEvent event) {
            // if you wish to know the status (connected/disconnected) of the WS connection
        }
    });
See ch.loway.oss.ari4java.ARI Methods
Packages 
Package Description
ch.loway.oss.ari4java  
ch.loway.oss.ari4java.generated.actions  
ch.loway.oss.ari4java.generated.models  
ch.loway.oss.ari4java.tools  
ch.loway.oss.ari4java.tools.http  
ch.loway.oss.ari4java.tools.tags