Johnson will join Kieger's coaching staff after being an assistant coach at the University of Miami.
The game will take place on June 8 at Rate Field in Chicago.
The Nittany Lions will look to rebound after a disappointing season last year.
The defending champions will play 16 matches against teams that made last year's NCAA Tournament in their 30-game schedule.
Throneberry is the seventh Penn State baseball player to enter the transfer portal.
Carter’s deal is worth $45.3 million fully guaranteed.