in src/main/java/org/apache/uima/json/jsoncas2/model/FeatureStructures.java [40:49]
public FeatureStructures(Collection<FeatureStructure> aFeatureStructures) {
typeNames = new HashSet<>();
featureStructures = aFeatureStructures.stream() //
.map(fs -> {
typeNames.add(fs.getType().getName());
return fs;
}) //
.sorted(comparing(fs -> fs.getType().getName())) //
.collect(toList());
}