unauthorized write error-how to generate

I am running into this issue where I am unable to check if the user has write permission and generate error. I am sure I am missing something. Can you please show which class to call in try to generate write error permission denied king of error, and what to catch?

No file, test, or entry point is named. Start by locating the Java client API method used for a write operation and its existing exception types, then reproduce the operation with a user lacking permission. Done means documenting the class or method to call, whether permission can be checked, and which error or exception should be caught.

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