Could not connect to the main data store: jdbc:mysql://localhost/contambdb?&useSSL=false&all

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#1

hi,
i installed mysql 8.4.9, After this update i received the error message: Could not connect to the main data store: jdbc:mysql://localhost/contambdb.
the connection line is: jdbc:mysql://localhost/contambdb?&useSSL=false&allowMultiQueries=true&serverTimezone=Europe/Rome.
my java version is 11.

can you help me please?

#2

i changed di string connection to: jdbc:mysql://localhost/contambdb?useSSL=false&allowMultiQueries=true&serverTimezone=Europe/Rome&allowPublicKeyRetrieval=true

i updated my.ini file with : [mysqld]
mysql_native_password=ON

i created a new user with: CREATE USER ‘cuba_user’@‘localhost’ IDENTIFIED BY ‘your_password’;
GRANT ALL PRIVILEGES ON contambdb.* TO ‘cuba_user’@‘localhost’;
FLUSH PRIVILEGES;

same problem