if(isCollection(field.getType())){
ExcelCollection collection = field
.getAnnotation(ExcelCollection.class);
fieldname = field.getName();
setMethod = getMethod(fieldname,clazz,field.getType());
setMethod.invoke(obj,ExcelPublicUtil.class.getClassLoader().loadClass(collection.type()).newInstance());
}else if(!isJavaClass(field)){
fieldname = field.getName();
setMethod = getMethod(fieldname,clazz,field.getType() );
setMethod.invoke(obj, createObject(field.getType(),targetId));
}