Why there is no non-parameterized constructor for certain classes

[Padmahas]

Hello,

We noticed some classes doesn't have non-parameterized constructor such as

1. com.google.api.ads.dfp.axis.v201708.GoalType;
2. com.google.api.ads.dfp.axis.v201708.UnitType;
3. TimeUnit etc

In some situation, I need to copy GoalType object to custom GoalType object using BeanUtils.copyProperties. Since GoalType doesn't have non-parameterized constructor, I need to initialize GoalType object to null. GoalType goalTy = null;

If I try to copy using BeanUtils to this null object, it will throw exception. "Target must not be null". BeanUtils.copyProperties(lineItemObj.getPrimaryGoal().getGoalType(), goalTy);

Is there is any specific reason for not to provide non-parameterized constructor?

Thank you.

[christopherseeley]

Yes, these are meant to represent enumerations and should not be null. However, the axis stub generation doesn't actually create these as Java enums, so the code is a little messy.

An alternative might be using the dfp_appengine module instead, which has properly generated Java enums.

If you're set on using the axis library, then you probably need to register a custom Converter.