How to set method breakpoint from plugin using class and method name only?

From within my plugin, I want to be able to set a breakpoint on a specific method within the code that is being debugged. The catch is that I don't know the file or line number containing the method -- the only information I have is the class name and the method name.

BreakpointManager.addMethodBreakpoint() requires a Document and lineIndex. I tried to use

session.process.virtualMachineProxy.virtualMachine.classesByName(className)

to look up the ReferenceType, which I could then use to call

methodsByName(methodName)

to get the Method object, and use that to find the file and line number. However, if I set this breakpoint right as the debug process is created, I can't guarantee that the class that I want to break on has been loaded yet, which means this lookup method won't work.

Are there any other ways to accomplish this?