Java Utililty Methods Reflection Generic Type from Class

return getGenericArgumentType(clazz, 0);

Type superType = currentClass.getGenericSuperclass();
if (superType == null) {
    throw new IllegalArgumentException(
            "Class '" + currentClass + "' doesn't have correct generic super class");
if (!(superType instanceof ParameterizedType)
        || genericSuperClass != null && ((ParameterizedType) superType).getRawType() != genericSuperClass) {
    return getGenericArgumentType(currentClass.getSuperclass(), genericSuperClass, argumentIndex);
...

return getGenericClass(clazz, 0);

Type genType = clazz.getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
    return Object.class;
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
return (Class) params[0];

return getGenericClass(clazz, 0);

Type type = getGenericType(clazz, index);
if (type instanceof Class<?>) {
    return (Class<?>) type;
throw new IllegalArgumentException("Generic parameter is not of type Class");

Type genType = clazz.getGenericSuperclass();
if (genType instanceof ParameterizedType) {
    Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
    if ((params != null) && (params.length >= (index - 1))) {
        return (Class) params[index];
return null;
...

Type t = clazz.getGenericSuperclass();
if (t instanceof ParameterizedType) {
    Type[] p = ((ParameterizedType) t).getActualTypeArguments();
    return ((Class<?>) p[0]);
return null;

Type[] actualTypeArguments = ((ParameterizedType) clazz.getGenericSuperclass()).getActualTypeArguments();
if (actualTypeArguments.length < index)
    throw new IndexOutOfBoundsException();
return (Class<T>) actualTypeArguments[index];

return getGenericClass(cls, 0);