Program: 58581
Project: 58581
Buggy source:
@SuppressWarnings("String_Node_Str") @Override public <K,V>Set<V> getIDAsSet(EIDType source,EIDType destination,K sourceID){
  Set<V> setResult=new HashSet<V>();
  if (source.equals(destination)) {
    setResult.add((V)sourceID);
    return setResult;
  }
  List<MappingEdge> path=DijkstraShortestPath.findPathBetween(mappingGraph,source,destination);
  Object currentID=sourceID;
  if (path == null)   return null;
  Set<Object> keys=null;
  Collection<Object> values=new ArrayList<Object>();
  for (  MappingEdge edge : path) {
    Map<?,?> currentMap=hashType2Mapping.get(edge.getMappingType());
    if (keys != null) {
      for (      Object key : keys) {
        if (edge.getMappingType().isMultiMap()) {
          Set<Object> temp=(Set<Object>)((MultiHashMap<?,?>)(currentMap)).getAll(key);
          if (temp != null)           values.addAll(temp);
        }
 else {
          Object value=currentMap.get(key);
          if (value != null)           values.add(value);
        }
      }
      if (values.isEmpty())       return null;
      keys=new HashSet<Object>();
      for (      Object value : values) {
        keys.add(value);
      }
      values.clear();
    }
 else {
      if (edge.getMappingType().isMultiMap()) {
        keys=(Set<Object>)((MultiHashMap<?,?>)(currentMap)).getAll(currentID);
        if ((keys == null) || (keys.isEmpty()))         return null;
      }
 else {
        currentID=currentMap.get(currentID);
        if (currentID == null)         return null;
      }
    }
  }
  if (keys != null)   return (Set<V>)keys;
  setResult.add((V)currentID);
  return setResult;
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") @Override public <K,V>Set<V> getIDAsSet(EIDType source,EIDType destination,K sourceID){
  Set<V> setResult=new HashSet<V>();
  if (source.equals(destination)) {
    setResult.add((V)sourceID);
    return setResult;
  }
  List<MappingEdge> path;
  try {
    path=DijkstraShortestPath.findPathBetween(mappingGraph,source,destination);
  }
 catch (  IllegalArgumentException e) {
    return null;
  }
  Object currentID=sourceID;
  if (path == null)   return null;
  Set<Object> keys=null;
  Collection<Object> values=new ArrayList<Object>();
  for (  MappingEdge edge : path) {
    Map<?,?> currentMap=hashType2Mapping.get(edge.getMappingType());
    if (keys != null) {
      for (      Object key : keys) {
        if (edge.getMappingType().isMultiMap()) {
          Set<Object> temp=(Set<Object>)((MultiHashMap<?,?>)(currentMap)).getAll(key);
          if (temp != null)           values.addAll(temp);
        }
 else {
          Object value=currentMap.get(key);
          if (value != null)           values.add(value);
        }
      }
      if (values.isEmpty())       return null;
      keys=new HashSet<Object>();
      for (      Object value : values) {
        keys.add(value);
      }
      values.clear();
    }
 else {
      if (edge.getMappingType().isMultiMap()) {
        keys=(Set<Object>)((MultiHashMap<?,?>)(currentMap)).getAll(currentID);
        if ((keys == null) || (keys.isEmpty()))         return null;
      }
 else {
        currentID=currentMap.get(currentID);
        if (currentID == null)         return null;
      }
    }
  }
  if (keys != null)   return (Set<V>)keys;
  setResult.add((V)currentID);
  return setResult;
}