Update connect method in SimpleDatabaseManager.java

.gitignore

@@ -1 +1,2 @@
 build/
+.gradle/

src/main/java/hhn/temp/project/provider/SimpleDatabaseManager.java

@@ -26,7 +26,7 @@ public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
   }
 
   @Override
-  public void connect() {
-    //...
+  public void connect() throws SQLException {
+    throw new SQLException("");
   }
 }