Program: 93496
Project: 93496
Buggy source:
ArrayList<DBObject> getCollectionData(DBCollection coll,int page,int pagesize,Deque<String> sortBy,Deque<String> filters,Deque<String> keys,DBCursorPool.EAGER_CURSOR_ALLOCATION_POLICY eager) throws JSONParseException {
  ArrayList<DBObject> ret=new ArrayList<>();
  int toskip=pagesize * (page - 1);
  DBCursor cursor;
  SkippedDBCursor _cursor=null;
  if (eager != DBCursorPool.EAGER_CURSOR_ALLOCATION_POLICY.NONE) {
    _cursor=DBCursorPool.getInstance().get(new DBCursorPoolEntryKey(coll,sortBy,filters,keys,toskip,0),eager);
  }
  int alreadySkipped;
  if (_cursor == null) {
    cursor=getCollectionDBCursor(coll,sortBy,filters,keys);
    alreadySkipped=0;
  }
 else {
    cursor=_cursor.getCursor();
    alreadySkipped=_cursor.getAlreadySkipped();
  }
  while (toskip > alreadySkipped) {
    cursor.next();
    alreadySkipped++;
  }
  while (pagesize > 0 && cursor.hasNext()) {
    ret.add(cursor.next());
    pagesize--;
  }
  ret.forEach(row -> {
    Object etag=row.get("String_Node_Str");
    if (row.get("String_Node_Str") == null && etag != null && etag instanceof ObjectId) {
      row.put("String_Node_Str",Instant.ofEpochSecond(((ObjectId)etag).getTimestamp()).toString());
    }
    Object id=row.get("String_Node_Str");
    if (row.get("String_Node_Str") == null && id != null && id instanceof ObjectId) {
      row.put("String_Node_Str",Instant.ofEpochSecond(((ObjectId)id).getTimestamp()).toString());
    }
  }
);
  return ret;
}

Fixed version (ground truth):
ArrayList<DBObject> getCollectionData(DBCollection coll,int page,int pagesize,Deque<String> sortBy,Deque<String> filters,Deque<String> keys,DBCursorPool.EAGER_CURSOR_ALLOCATION_POLICY eager) throws JSONParseException {
  ArrayList<DBObject> ret=new ArrayList<>();
  int toskip=pagesize * (page - 1);
  DBCursor cursor;
  SkippedDBCursor _cursor=null;
  if (eager != DBCursorPool.EAGER_CURSOR_ALLOCATION_POLICY.NONE) {
    _cursor=DBCursorPool.getInstance().get(new DBCursorPoolEntryKey(coll,sortBy,filters,keys,toskip,0),eager);
  }
  if (_cursor == null) {
    cursor=getCollectionDBCursor(coll,sortBy,filters,keys);
    cursor.skip(toskip);
    while (pagesize > 0 && cursor.hasNext()) {
      ret.add(cursor.next());
      pagesize--;
    }
  }
 else {
    int alreadySkipped;
    cursor=_cursor.getCursor();
    alreadySkipped=_cursor.getAlreadySkipped();
    while (toskip > alreadySkipped && cursor.hasNext()) {
      cursor.next();
      alreadySkipped++;
    }
    while (pagesize > 0 && cursor.hasNext()) {
      ret.add(cursor.next());
      pagesize--;
    }
  }
  ret.forEach(row -> {
    Object etag=row.get("String_Node_Str");
    if (row.get("String_Node_Str") == null && etag != null && etag instanceof ObjectId) {
      row.put("String_Node_Str",Instant.ofEpochSecond(((ObjectId)etag).getTimestamp()).toString());
    }
    Object id=row.get("String_Node_Str");
    if (row.get("String_Node_Str") == null && id != null && id instanceof ObjectId) {
      row.put("String_Node_Str",Instant.ofEpochSecond(((ObjectId)id).getTimestamp()).toString());
    }
  }
);
  DBCursorPool.getInstance().populateCache(new DBCursorPoolEntryKey(coll,sortBy,filters,keys,toskip,0),eager);
  return ret;
}