I can't find any action on the project in the Java Api, such as create, modify. Does the Jira software Java API provide operations on the project ?
I do not think we can answer that usefully. "Create" and "Modify" very much are supported by the REST APIs and have been (albeit SOAP for older systems) for almost 2 decades.
There is a lot of stuff supported over REST, but a lot of things that are not too. Could you explain what you are trying to do (over REST) in some more detail please?
It depends which operation you're looking for, but this page should be a good start.
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