core/src/main/java/io/fabric8/maven/core/util/PropertiesMappingParser.java
public Map<String, List<String>> parse(final InputStream mapping) {

        final Properties mappingProperties = new Properties();
        try {
            mappingProperties.load(mapping);

            final Map<String, List<String>> serializedContent = new HashMap<>();

            final Set<String> kinds = mappingProperties.stringPropertyNames();

            for (String kind : kinds) {
                final String filenames = mappingProperties.getProperty(kind);
                final String[] filenameTypes = filenames.split(",");
                final List<String> scannedFiletypes = new ArrayList<>();
                for (final String filenameType : filenameTypes) {
                    scannedFiletypes.add(filenameType.trim());
                }
                serializedContent.put(kind, scannedFiletypes);
            }

            return serializedContent;
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
    }
public Map<String, List<String>> parse(final InputStream mapping) {

        final Properties mappingProperties = new Properties();
        try {
            mappingProperties.load(mapping);

            final Map<String, List<String>> serializedContent = new HashMap<>();

            final Set<String> kinds = mappingProperties.stringPropertyNames();

            for (String kind : kinds) {
                final String filenames = mappingProperties.getProperty(kind);
                final String[] filenameTypes = filenames.split(",");
                final List<String> scannedFiletypes = new ArrayList<>();
                for (final String filenameType : filenameTypes) {
                    scannedFiletypes.add(filenameType.trim());
                }
                serializedContent.put(kind, scannedFiletypes);
            }

            return serializedContent;
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
    }
This method reads properties file to load custom mapping between kinds and filenames.

<pre>
ConfigMap=cm, configmap
Service=service
</pre>

@param mapping
stream of a properties file setting mappings between kinds and filenames.

@return Serialization of all elements as a map