Java compilation error: switch on enum -

i came across weird error can't figure out how solve.

a project, compiles fine on windows, doesn't compile on linux following error:

cannot switch on value of type aclass.bbb. convertible int values, strings or enum variables permitted

, though stated type is enum.

the code of class along these lines:

 public class aclass {     private enum bbb {         one,         two;     }     public void amethod(list<bbb> arg) {         (bbb en : arg) {             switch (en) {                 ....             }         }     } } 

the en in switch(en) underlined, error notification stated above.

has else had it? there way solve this?

upd java version:

 java version "1.7.0_25" java(tm) se runtime environment (build 1.7.0_25-b15) java hotspot(tm) 64-bit server vm (build 23.25-b01, mixed mode) 

i have tried code

public class aclass {      enum bbb {         one,         two;     }     public void amethod(list<bbb> arg) {         (bbb en : arg) {             switch (en) {                  case one: system.out.println("one");break;                 case two: system.out.println("two");break;             }         }     }     public static void main(string[] args) {          list<bbb> list = new arraylist<bbb>();         list.add(bbb.one);         list.add(bbb.two);          new aclass().amethod(list);     } } 

it working fine.
i dont know pros , cons of passing argument list<bbb> arg atleast not error as know in java 7