After a quick search, I found this StackOverflow thread about 'Cannot find symbol' error which discusses in detail how this error is related to the identifiers.
It seems that your actual issue is related to debugging your application. For further assistance I would recommend posting a question to StackOverflow which we also monitor, as this falls outside the scope of the issue tracker which is intended for issue reports and feature request. Check out our community support page for the list of tags we monitor.