Google Cloud SQL Exception - mysql

Question

I am trying to do a SQL database in Google Cloud SQL and with a Java project make many queries to the database, but I have this answer:
Buckets:
Exception in thread "main" com.google.cloud.storage.StorageException: java.lang.NullPointerException: Required parameter project must be specified.
at com.google.cloud.storage.StorageException.translateAndThrow(StorageException.java:73)
at com.google.cloud.storage.StorageImpl.listBuckets(StorageImpl.java:288)
at com.google.cloud.storage.StorageImpl.list(StorageImpl.java:257)
at package1.Auth.authExplicit(Auth.java:46)
at package1.Main.main(Main.java:21)
Caused by: java.lang.NullPointerException: Required parameter project must be specified
public static void main(String[] args) throws IOException {
String instanceConnectionName="";
String databaseName="prueba";
String username="root";
String password="root";
String sql="SELECT * FROM alumnos";
String jsonPath="/Users/franciscomanuelpozodelmoral/Downloads/Team5-c4e75c7cb498.json";
Auth.authExplicit(jsonPath);
try {
Class.forName("com.mysql.jdbc.Driver");
String jdbcURL=String.format("jdbc:mysql://google/%s?cloudSqlInstance=%s&" +
"socketFactory=com.google.cloud.sql.mysql.SocketFactory",databaseName,instanceConnectionName);
Connection connection=DriverManager.getConnection(jdbcURL, username, password);
Statement statement=connection.createStatement();
ResultSet rs=statement.executeQuery(sql);
while(rs.next()) {
System.out.println(rs.getString("DNI") + rs.getString("Nombre") + rs.getString("Apellidos") + rs.getInt("Telefono")+rs.getInt("Curso"));
}
} catch(Exception e) {
e.printStackTrace();
}
}
public class Auth {
static void authImplicit() {
// If you don't specify credentials when constructing the client, the client library will
// look for credentials via the environment variable GOOGLE_APPLICATION_CREDENTIALS.
//Storage storage = StorageOptions.getDefaultInstance().getService();
Storage storage=StorageOptions.getDefaultInstance().getService();
System.out.println("Buckets:");
Page<Bucket> buckets = storage.list();
for (Bucket bucket : buckets.iterateAll()) {
System.out.println(bucket.toString());
}
}
static void authExplicit(String jsonPath) throws IOException {
// You can specify a credential file by providing a path to GoogleCredentials.
// Otherwise credentials are read from the GOOGLE_APPLICATION_CREDENTIALS environment variable.
GoogleCredentials credentials = GoogleCredentials.fromStream(new FileInputStream(jsonPath))
.createScoped(Lists.newArrayList("https://www.googleapis.com/auth/cloud-platform"));
Storage storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();
System.out.println("Buckets:");
Page<Bucket> buckets = storage.list();
// for (Bucket bucket : buckets.iterateAll()) {
// System.out.println(bucket.toString());
// }
}
}
Can you help me? Thanks (The instanceConnectionName is group5...)