How to get the Generic type at runtime?
By trying to create a Java Persistence like API, I started using some generic lists to be more specific
Collection<MyObjectType> x =null;
And I would like through reflection to create objects ofMyObjectType, add them to an ArrayList and return it.
Why not simply create directlyMyObjectTypes? well, that is because hat is mainly an screen name, in fact
there could be many classes containing a Collection of any object type, and there is a Manager which will fill
it with that Collection's generic objects.
I haven't found any code that helps me serve that purpose, but by debugging a main application, I can see the
next thing.
Using reflection over the field, I get a Field object representation.
Field f;
...
Type t = f.getGenericType();
After executing the getGenericType() method, thef variable has aFieldRepository object
namedgenericInfo, which holds aParametrizedTypeImpl object namedgenericType which is the
type somehow returned by thegetGenericType() method as aType (returning
java.util.Collection<myPackage.MyObjectType>), which is not useful, since I'm looking
only formyPackage.MyObjectType.
Now, that genericType object has 3 main objects (actualTypeArguments, ownerType, rawType).
TheactualTypeArguments is the one we care about since it is an Type[] which finally contains, for this
case, inactualTypeArguments[0] themyPackage.MyObjectType type which is the one I need.
THE BIG PROBLEM IS, all these variables are private and I haven't found any public method that lets me
access them.
Any ideas, or have you found a way to do this I'm requiring?
Thanks in advance.
