I have a PropertyBusinessObject Vehicle Object defined with:
```
public final LongProperty<Vehicle> id = new LongProperty<>("id", new
Long(-1));
public final IntProperty<Vehicle> height = new IntProperty<>("height");
public final IntProperty<Vehicle> length = new IntProperty<>("length");
public final IntProperty<Vehicle> width = new IntProperty<>("width");
public final IntProperty<Vehicle> weight = new IntProperty<>("weight");
...
public Vehicle() {
id.setNullable(true);
height.setNullable(true);
length.setNullable(true);
width.setNullable(true);
weight.setNullable(true);
}
```
The problem I have is that, when I want to internalize one of this stored
Vehicle object with a null IntProperty, I end up with an error like that:
```
java.lang.NullPointerException: height can't be null
at com.codename1.properties.NumericProperty.set(NumericProperty.java:87)
at
com.codename1.properties.MyPropertyIndex$1.internalize(MyPropertyIndex.java:285)
at com.codename1.io.Util.readObject(Util.java:693)
at com.codename1.io.Util.readObject(Util.java:664)
at com.codename1.io.Storage.readObject(Storage.java:261)
```
I don't realy know how to solve this issue (exept by forcing my IntProperty
to have a default value, like I did for `id`. But I would like to keep it
null if possible as I also bind these properties to ui and a null
Intproperty value would directly convert to an empty String in a TextField
whereas a default -1 of 0 value for example, would be directly displayed as
it is).
I assume that the internalization process don't call the Vehicle() default
constructor, which is why my setNullable(true) are not called in this case.
Is there another way I could define my IntProperty as nonNullable to avoid
this?
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