How to use

UnavailableServiceException

in

javax.jnlp

/**
 * Returns the service.
 *
 * @throws UnavailableServiceException if service is not available
 */
public Object lookup(String name) throws UnavailableServiceException {
  // exact match
  for (int i=0; i < serviceNames.length; i++)
    if (serviceNames[i].equals(name))
      return services[i];
  // substring match
  for (int i=0; i < serviceNames.length; i++)
    if (-1 != serviceNames[i].indexOf(name))
      return services[i];
  throw new UnavailableServiceException(""+name);
}

public static java.lang.Object lookup(java.lang.String name) throws UnavailableServiceException {
 if (stub == null)
  throw new UnavailableServiceException("service stub not set.");
 synchronized(lookupTable) {
  Object result = lookupTable.get(name);
  if (result == null) {
   result = stub.lookup(name);
   if (result != null)
    lookupTable.put(name, result);
  }
  if (result == null)
   throw new UnavailableServiceException("service not available (stub returned null).");
  return result;
 }
}