Hotfix to address the IOException in the SimpleDatabaseManager class, modified modifier and deleted useless test.

test/hhn/temp/project/DatabaseGoodCasesTest.java

@@ -7,8 +7,6 @@ import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
 
-import java.io.IOException;
-import java.net.URISyntaxException;
 import java.sql.SQLException;
 import java.util.Collection;
 import java.util.List;
@@ -82,9 +80,4 @@ public class DatabaseGoodCasesTest {
     assertEquals(0, databaseManager.getTotalNumberOfTasks());
     assertEquals(0, databaseManager.getTotalNumberOfWorkers());
   }
-
-  @Test
-  public void testRandom() throws IOException, URISyntaxException {
-     System.out.println(databaseManager.loadFile(SimpleDatabaseManager.QueryMode.INSERT_TASK));
-  }
 }