How to return null from a generic function in Scala?

Question

I am writing my own simple javax.sql.DataSource implementation, the only method of it I need to work is getConnection: Connection, but the interfac

Answer 1

As said in comments, this solution doesn't work

If I understood your problem well, you can also assign default values, as explained in details in what does it mean assign "_" to a field in scala?. You can find more infos in 4.2 Variable Declarations and Definitions of the The Scala Language Specification

So you can simply do:

def unwrap[T](iface: Class[T]): T = _

which will set unwrap with null without the type mismatch.