Extra-time goals from Arjen Robben and Thomas Mueller handed Bayern Munich a 2-0 German Cup final victory over rivals Borussia Dortmund and secured a tenth domestic double.             

Dutchman Robben, who scored the winner against Dortmund in the Champions League final last season, tapped in at the far post in the 107th minute after the country's top two teams slugged it out in a goalless but entertaining 90 minutes.             

Mueller then raced clear deep in stoppage time to complete the win over their bitter rivals immediately after Marco Reus had missed a chance to equalise.

Victory ended a bad run for Bayern who had won the league title with seven games to spare in Pep Guardiola's first season in charge before hitting a slump in form, including a comprehensive Champions League semi-final defeat by Real Madrid.             

"We are here, won the double, had a super season and that's the bottom line"

"It was a very important goal," Robben told ARD television. "This was a Cup, and we really wanted to win it. We are here, won the double, had a super season and that's the bottom line."             

The final was marked by a controversial goalline incident with Mats Hummels' header in the 64th minute cleared on the line by Bayern defender Dante with television replays showing the entire ball may have crossed the line.             

German football bosses earlier in the year voted against the introduction of goalline technology but the latest incident is set to renew the debate.             

Bayern, missing injured Bastian Schweinsteiger and David Alaba, also had captain Philipp Lahm limp off with a muscle injury after less than half an hour.              

Already missing Thiago Alcantara, who had knee surgery on Thursday, Bayern were desperate to end the season on a high after their form nose-dived spectacularly in March.