Eclipse调试模式问题

Question

我的源代码没有产生任何错误且没有警告但是当我运行调试模式时，堆栈显示为：

    Thread [main] (Suspended (exception FileNotFoundException)) 
    FileInputStream.open(String) line: not available [native method]    
    FileInputStream.<init>(File) line: not available    
    Toolkit$1.run() line: not available [local variables unavailable]   
    AccessController.doPrivileged(PrivilegedAction<T>) line: not available [native method]  
    Toolkit.initAssistiveTechnologies() line: not available [local variables unavailable]   
    Toolkit.<clinit>() line: not available [local variables unavailable]    
    Component.<clinit>() line: not available [local variables unavailable]  

    C:\Program Files\Java\jre7\bin\javaw.exe (Dec 26, 2012 10:01:35 AM) 

Src：https://gist.github.com/4381312