Spec for j.l.r.TypeVariable.getAnnotatedBounds() says:
"Returns an array of length 0 if the type parameter declares no bounds."

The following minimized test shows that if the type parameter declares no bounds, the methods returns array of length 1:
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public class Test {

    public static void main(String[] args) {
        AnnotatedTypeVariable atv = (AnnotatedTypeVariable) ((AnnotatedParameterizedType) Cls.class.getAnnotatedInterfaces()[0])
                .getAnnotatedActualTypeArguments()[0];
        TypeVariable tv = (TypeVariable) atv.getType();

        // should return an empty array
        // Assertion: "Returns an array of length 0 if the type parameter declares no bounds."
        AnnotatedType[] aBounds = tv.getAnnotatedBounds();
        System.out.println(aBounds.length);
        System.out.println(aBounds[0].getType());
    }
}

interface Intf<T> {}

class Cls<T> implements Intf<T> {}
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Output will be:
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1
class java.lang.Object
1
class java.lang.Object
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Output should be:
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1
class java.lang.Object
0
...ArrayIndexOutOfBoundsException...
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Tested with 8u20