protected String[] getLocations() {
		String[] locations = StringUtils.commaDelimitedListToStringArray(getExtensionsLocations());
		for (int i = 0; i < locations.length; i++) {
			if (!prefix.matcher(locations[i]).find()) {
				locations[i] = "classpath*:" + locations[i];
			}
			if (!locations[i].endsWith("/")) {
				locations[i] = locations[i] + "/";
			}
			locations[i] = locations[i] + "**/*.*";
		}
		return locations;
	}
This will prepend "classpath*:" to each location if no Resource prefix provided.

@return an array of locations
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/container/initializer/AbstractResourceBeanDefinitionProvider.java