fix author

src/main/java/ru/ulstu/extractor/service/AuthorService.java

@@ -25,7 +25,7 @@ public class AuthorService {
     public Author findOrCreate(Author author) {
         Optional<Author> newAuthor = authorRepository.findByName(author.getName()).stream().findAny();
         if (newAuthor.isEmpty()) {
-            LOG.debug("Author {} was saved.", author);
+            LOG.debug("Author {} was saved.", author.getName());
             return authorRepository.save(author);
         }
         return newAuthor.get();

src/main/java/ru/ulstu/extractor/service/GitRepositoryService.java

@@ -58,6 +58,7 @@ public class GitRepositoryService {
     private static final String BRANCH_PREFIX = "refs/remotes/origin/";
     @Value("${extractor.custom-projects-dir}")
     private String customProjectsDir;
+    private final ExecutorService executorService = Executors.newFixedThreadPool(4);
 
     private final StructuralUnitService structuralUnitService;
 
@@ -251,7 +252,6 @@ public class GitRepositoryService {
                 if (maybeFileName.isPresent()) {
                     fileChange = new FileChange();
                     fileChange.setFile(maybeFileName.get());
-                    ExecutorService executorService = Executors.newFixedThreadPool(2);
                     Future<Boolean> futureEntity = executorService.submit(() -> {
                         return structuralUnitService.containsEntity(getContent(repository, commit, maybeFileName.get()));
                     });