Refer to JDK-6937964, from Bug6937964Test, the following code throws ISE:

                Duration duration = datatypeFactory.newDurationYearMonth("P1Y");
                try {
                    QName xmlSchemaType = duration.getXMLSchemaType();
                } catch (IllegalStateException illegalStateException) {
                    // TODO; this test really should pass
                    System.err.println("Please fix this bug that is being ignored, for now: " + illegalStateException.getMessage());
                }