Exception in Thread "main" Java.sql.SQLException: Access Denied for User ''@'localhost' (Using Password: NO)

This error often occurs when attempting to establish a database connection using incorrect credentials or insufficient user privileges. Let's delve into the details and provide a comprehensive solution.

Understanding the Error Message

The error message "Access denied for user ''@'localhost' (using password: NO)" indicates that the MySQL server failed to grant access to the user specified in the connection string. The single quotes around the empty string suggest that the username is empty. The "using password: NO" part indicates that the connection attempt was made without providing a password.

Troubleshooting Steps

To resolve this issue, follow these steps:

1. Verify Username and Password: Ensure that the username and password you are using to connect to the database are correct. Double-check your MySQL Workbench settings and connection string.
2. Check User Privileges: In your MySQL database, grant appropriate privileges to the specified user or create a new user with the necessary permissions.
3. Ensure Successor Credentials: If you have created a new user, ensure that you have granted the successor credentials the proper privileges.
4. Update Java Code: In your Java code, replace the empty username with the correct username and provide the correct password.
5. Confirm Connection: Recompile and run your Java application. You should now be able to establish a successful database connection.

Additional Considerations

Ensure that your MySQL server is running on the specified port (3306 in the code provided) and is listening on the localhost address.

Note for Eclipse Users

If you are running your Java application in Eclipse, ensure that you are executing the class that contains the main method (MainApp in the code provided). Avoid running other classes with main methods unless intended.

By following these steps, you should be able to resolve the "Access denied for user ''@'localhost' (using password: NO)" error and establish a successful connection to your MySQL database.