مشکل با compile برنامه در jdk 7

C:\Documents and Settings\Administrator\Desktop\Server\com\dgnt\di\clie
nt>javac bh.java
bh.java:3: error: package com.esial.util does not exist
import com.esial.util.c;
                     ^
bh.java:25: error: cannot find symbol
    public static bi f = null;
                  ^
  symbol:   class bi
  location: class bh
bh.java:20: error: package com.esial.util does not exist
    public static String a = com.esial.util.c.a("name");
                                           ^
3 errors