Webapplication integration with Outlook - Graph API Authentication

Question

I have followed the procedure as per https://learn.microsoft.com/en-us/graph/tutorials/java and able to create events and access outlook calendar through API. However while executing this code a human intervention is required since the App Id is used, every time I execute the code, the device login is required (To sign in, use a web browser to open the page https://microsoft.com/devicelogin and enter the code EWSMQRNX9 to authenticate.) Looking for ways to see are there any other ways this authentications can be performed ? since we will be using web application this way of verifying the device would not work. is there any token authentication which can be configured at application server level so that this device login is not required every time