TwilioTest.java

public class TwilioTest {
	public static final String ACCOUNT_SID = "xyz";
	public static final String AUTH_TOKEN = "xyz";
	public static String conferenceSid;

	public static void main(String[] args) {
		Twilio.init(ACCOUNT_SID, AUTH_TOKEN);
		ResourceSet<Conference> conferences = Conference.reader().setStatus(Conference.Status.IN_PROGRESS).read();
		for (Conference conference : conferences) {
			conferenceSid = conference.getSid();
			System.out.println("Conference SID: " + conference.getSid());
		}

		if(conferenceSid != null) {
			ResourceSet<Participant> participants = Participant.reader(conferenceSid).read();
			for (Participant participant : participants) {
				String participantSid = participant.getSid();
				System.out.println("Participant SID: " + participantSid);
				Participant.updater(conferenceSid, participantSid)
						.setHold(true)
						.setHoldUrl("https://storage.googleapis.com/receivr-sound-resources/Into%20Infinite%20Obscurity%20(Dissection%20cover).mp3")
						.update();
				System.out.println("Participant Hold: " + participant.getHold());
			}
		}
	}
}