try (DiffFormatter diffFormatter = new DiffFormatter(NullOutputStream.INSTANCE)) {
                                diffFormatter.setRepository(repository);
                                for (DiffEntry entry : diffFormatter.scan(commit.getParent(0), commit)) {
                                    if (entry.getChangeType() == DiffEntry.ChangeType.MODIFY && entry.getNewPath().endsWith(".java")) {
                                        System.out.println(entry.getNewPath());
                                        if (listOfFile.containsKey(entry.getNewPath())){
                                            listOfFile.replace(entry.getNewPath(), true);
                                        } else {
                                            listOfFile.put(entry.getNewPath(), true);
                                        }
                                    }
                                }