How to get type arguments class of generic method parameter? [duplicate]

Question

How to get the type argument of an argument passed to a method ? For example I have

List<Person> list = new ArrayList<Person>(); 

public class Datastore {

  public <T> void insert(List<T> tList) {
     // when I pass the previous list to this method I want to get Person.class ; 
  }
} 

Answer 1

Due to type erasure, the only way you can do it is if you pass the type as an argument to the method.

If you have access to the Datastore code and can modify you can try to do this:

public class Datastore {
    public T void insert(List<T> tList, Class<T> objectClass) {
    }
}

and then call it by doing

List<Person> pList = new ArrayList<Person>();
...
dataStore.insert(pList, Person.class);

Every response I've seen to this type of question was to send the class as a parameter to the method.