Can Reflection Reveal Generic Parameter Types in Java?

Retrieving Generic Parameter Types via Reflection in Java

Query: Can we ascertain the type of a generic parameter using reflection techniques?

Consider the following example:

public final class Voodoo {
    public static void chill(List<? extends SpiderMan> aListWithTypeSpiderMan) {
        // Obtain the Class object for 'SpiderMan'
        Class typeOfTheList = ???;
    }

    public static void main(String... args) {
        chill(new ArrayList<SpiderMan>());
    }
}

Solution:

A promising approach for extracting the generic parameter type is as follows:

Class<T> persistentClass = (Class<T>)
   ((ParameterizedType)getClass().getGenericSuperclass())
      .getActualTypeArguments()[0];

This rather arcane reflection-based incantation appears to furnish us with the desired result, but a more profound understanding of its intricacies eludes me for now.

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