Heckathorn, 22, was taken 21 picks after Arnett in the '09 Draft and was 0-1 with a 6.04 ERA in six games (five starts) with Helena.
The 23-year-old Braddock was drafted by Milwaukee in the 18th round in 2005. He split last season between Class A Brevard County and Double-A Huntsville, going a combined 3-2 with a 1.79 ERA in 26 relief appearances. Braddock had 62 strikeouts and limited opposing hitters to a .193 average in 40 1/3 total innings.
Lucroy, 24, was Milwaukee's third-round pick in 2007. He batted .267 with nine home runs and 66 RBIs in 125 games with Huntsville. A patient hitter, he walked 78 times for a solid .380 on-base percentage.
The 24-year-old Maldonado was signed as a Minor League free agent by the Brewers in January 2007 after being drafted in the 27th round by the Angels three years earlier. He split the 2009 season at three levels, including a stop at Triple-A Nashville, and finished the year with a combined .201 average, two homers and 26 RBIs in 95 games.
Schafer, 23, was a Florida State League postseason All-Star in 2009 after batting .313 with six homers, 58 RBIs and 16 steals in 113 games with Brevard. The left-handed hitter also went also went 5-for-23 in seven games with Huntsville.
With these seven additions, the Brewers' Spring Training roster now includes 52 players.
Ed Eagle is a reporter for MLB.com This story was not subject to the approval of Major League Baseball or its clubs.