While I don't see the problem reported in issue 2 in the new filtered streamreader, I did find an interesting question about these getters. I added a unit test which shows that when an element does not have attribute, in the following methods:
                    r1.getAttributeValue(0);
                    r1.getAttributeType(0);
                    r1.getAttributePrefix(0);
                    r1.getAttributeNamespace(0);
                    r1.getAttributeName(0);
only the last would throw an exception, even so, the exception was not thrown from getAttributeName. here's the exception:
        at com.sun.xml.stream.XMLReaderImpl.convertXNIQNametoJavaxQName(XMLReaderImpl.java:1209)
        at com.sun.xml.stream.XMLReaderImpl.getAttributeName(XMLReaderImpl.java:633)
        at com.sun.xml.stream.XMLStreamFilterImpl.getAttributeName(XMLStreamFilterImpl.java:200)
        at XMLStreamFilterTest.GettersTest.checkAttributes(GettersTest.java:94)
        at XMLStreamFilterTest.GettersTest.testGetAttributes(GettersTest.java:152)