Eclipse debugger is dropping out for seemingly no reason anyone dealt with this before?

I have been debugging a Roman Calculator program I wrote for a class. For reasons unknown when I run the debugger after I enter in my operands the debugger seems to enter an infinite loop the "Resume" , "Suspend", "Terminate" and all the "Step" buttons on the debugger toolbar turn light grey and cannot be used. The strange thing about this is that when I run the program outside the debugger it runs completely, albeit with a few errors but no infinite loops. what is going on?