Another try

src/main/java/at/ac/uibk/gitsearch/service/ExerciseService.java

@@ -92,6 +92,7 @@ public class ExerciseService {
         repo.close();
         try {
             FileUtils.deleteDirectory(new File("tmp-import", exerciseToken));
+            FileUtils.deleteDirectory(repo.getDirectory().getParentFile());
         } catch (IOException e) {
             log.error("Could not remove directory: {} \n", e.getMessage());
         }