Failed to configure a DataSource url attribute is not specified and no embedded datasource could

be configured.

This error occurs when Spring Boot is unable to find a valid configuration for the data source. The most common cause of this error is that the application is missing the required configuration properties for the data source.

To fix this error, you need to provide the required configuration properties for the data source. This can be done in the application.properties or application.yml file. You need to specify the URL, username, and password for the data source.

For example, if you are using MySQL, you can add the following properties to the application.properties file:

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=root
spring.datasource.password=secret

Replace "mydatabase" with the name of your database, "root" with the username of your MySQL server, and "secret" with the password of your MySQL server.

Once you have added the required configuration properties, restart your application and the error should be resolved