@Ross_Grambo thx for the quick update!
Point 1:
I updated to the lates java client 10.3 and can now see the methods to create and fetch sections over the api → this solves that part 
Point 2:
I don’t see a way to create a task in a section directly with the java library in contrast to some forum posts showing how to do this with the the rest interface see here or here.
Strangely enough I could not find this in the REST documentation for the task creation here.
So I only see the 2 step option to create the task in a project and then in a second step assign it to a project see here.
Is there a better way or do I have to make these 2 calls?
Best Regards,
Ron