Wierd Error: I don't know what it means

Question

While using the debugger, a window popped up saying:
breakpoint hit in a file for which the source connot be found filename: <no source at frame 0>
I don't know what it means or what could have caused it. The code I was running at the time was a routine loop:
for (int e = 0; e<100; e++){
for(int f = 0; f<100;f++){
placeable[e][f] = 0;
//System.out.println(e);
if (reader.getMap(e,f) > 9)
placeable[e][f] = 1;
Thanks,
Eric

Answer 1

LordEricO wrote:
While using the debugger, a window popped up saying:
breakpoint hit in a file for which the source connot be found filename: <no source at frame 0>It means it hit a breakpoint where the source cannot be found.
Likely this means it is calling a method in a java.* package. Or not. Does it keep going? Is this a major problem for you?
I feel I must comment on the number of "magic" numbers in the posted code snippet. That doesn't look so good. Magic numbers are the things like 100 and 9. If you have an array use the length of the array don't use magic numbers that could very well be wrong (and cause problems) and are not self-documenting the way array.length is.