Did some searching through IntelliJ Help PDF:
Help Doc pg. 431
Their documentation Describes the checkmark as “Shown at run-time when the breakpoint is
recognized by the debugger as set on an
executable code line.”
and the regular red dot as “Shown at design-time or during the debugging
session when the class with such breakpoint is
not yet loaded.
“
So it would seem that the line you’re adding the breaking point to never gets executed. You can try stepping up line by line through the class to make sure the class is not getting hung up somewhere.