i do like following, and id does success;

List<FieldDescriptor> fieldlist = 
> dynamicmsg.getDescriptorForType().getFields();
>     Protocal.Builder buildermsg = Protocal.newBuilder();
>     for(FieldDescriptor fieldDp : fieldlist){
>     buildermsg.setField(fieldDp,  dynamicmsg .getField(fieldDp));
>     }
>     Protocal head = buildermsg.build();

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