See [1723] Default new project with Swift and Java prints excessive errors for the first part. Those are expected. Java throws a bunch of (caught) exceptions when running an app, and because you are running in the debugger these show a message (but don’t break, because the debugger is set to ignore these two exceptions, because they are expected). But we’ll review options for how to make this more obvious and handle this even better.
As for the error creating a graphic context — can you send us a complete project that shows this?
Thanx,
marc