What is the process for adding a service principle to an Azure Blob container in order to manage ACL using the Azure SDK for Java?

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The process for adding a service principal to an Azure Blob container in order to manage access control lists (ACL) using the Azure SDK for Java involves the following steps:

1. Create an instance of the DefaultAzureCredentialBuilder class and pass in the appropriate credentials for your service principal.

2. Create an instance of the BlobServiceClientBuilder class and set the credential property to the instance of the DefaultAzureCredentialBuilder created in step 1.

3. Use the BlobServiceClientBuilder instance to create an instance of the BlobServiceClient class, passing in the URL of your Azure Blob storage account.

4. Create an instance of the BlobContainerClient class to represent the blob container you want to manage ACL for, passing in the name of the container and the instance of BlobServiceClient created in step 3.

5. Use the BlobContainerClient instance to create an instance of the BlobContainerAccessPolicies class, representing the ACL for the container.

6. Use the BlobContainerAccessPolicies instance to add or remove access policies for the container, specifying the appropriate permissions and start and expiry times.

7. Use the BlobContainerClient instance to set the container's access policy using the setAccessPolicy method, passing in the instance of BlobContainerAccessPolicies created in step 5.

8. Finally, use the BlobContainerClient instance to get the container's access policy using the getAccessPolicy method, which will return the updated access policy.

Note that some of the methods mentioned above are asynchronous and return a Mono or Flux instance. You will need to handle these return types appropriately using RxJava or another asynchronous programming framework.