Despite entering the correct username and password using JWT JPA, why does Spring Security still show a 403 error during authentication or login?

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There could be several reasons for this issue:

1. Authentication is not properly set up: Make sure that you have properly set up your authentication with Spring Security. Check your SecurityConfig class and ensure that you have enabled authentication.

2. Incorrect configuration of CORS: If your application is a Single Page Application, then you may need to configure CORS to allow requests from other domains. You can do this by configuring CORS in your SecurityConfig class.

3. Incorrect authorization: Even if you have authenticated the user, they may not have sufficient authorization to access the requested page or API endpoint. Ensure that your authorization rules are correctly set up in your SecurityConfig class.

4. Invalid JWT token: Check if the JWT token is valid and has not expired. If it has, you may need to generate a new token.

5. Incorrect password encoding: Make sure that you are encoding passwords properly before storing them in the database. If the passwords are not encoded properly, Spring Security will not be able to authenticate the user.

6. Insufficient database permissions: Ensure that the user has sufficient permissions to access the required database tables.

7. Incorrect URL mapping: Ensure that the request URL and the URL mapping in your SecurityConfig class match.