Raw use of parameterized class

I wrote a helper method for getting values of static fields of specified type via reflection. The code is working fine, but I am getting "raw use of parameterized class" warning on line:

final List<Collection> fields = getStaticFieldValues(Container.class, Collection.class);

The issue is that type parameter T can be generic type. Is there way to rewrite method getStaticFieldValues to work around this issue?

Code listing:

import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;


import java.lang.reflect.*;
import java.util.*;


import org.junit.Test;


public class GenericsTest {


@Test
public void test() {
// Warning "raw use of parameterized class 'Collection'"
final List<Collection> fields = getStaticFieldValues(Container.class, Collection.class);
assertEquals(asList("A", "B", "C"), fields.get(0));
}


private static <T> List<T> getStaticFieldValues(Class<?> fieldSource, Class<T> fieldType) {
List<T> values = new ArrayList<>();
Field[] declaredFields = fieldSource.getDeclaredFields();
for (Field field : declaredFields) {
if (Modifier.isStatic(field.getModifiers()) && fieldType.isAssignableFrom(field.getType())) {
try {
final T fieldValue = (T) field.get(null);
values.add(fieldValue);
} catch (IllegalAccessException e) {
throw new RuntimeException("Error getting static field values");
}
}
}
return values;
}


public static class Container<T> {
public static Collection<String> elements = asList("A", "B", "C");
}
}