A certain part in the SessionTimeOutTests currently has the following check:

    String isTimedout = "YES";
    ...
    if (nextSess != null) {
        if (isEqualSessionId(nextSess.getId(), sess.getId())) {
            isTimedout = "NO";
            nextSess = null;
        }
    } else if (e.hasMoreElements()) {
        nextSess = sessCtx.getSession((byte[]) e.nextElement());
        if ((nextSess != null) && isEqualSessionId(nextSess.getId(),
                                sess.getId())) {
            nextSess = null;
            isTimedout = "NO";
        }
    }

    ....
    if ((timeout != 0) && (lifetime > timeout) &&
                        (isTimedout.equals("NO"))) {
                throw new Exception("Session timeout test failed for session: "
                                + sess + " lifetime: " + lifetime);
            }
    if (((timeout == 0) || (lifetime < timeout)) &&
                          (isTimedout == "YES")) {
        isTimedout = "Invalidated before timeout";
    }

The isTimedout == "YES" isn't right and should instead use the equals() method, just like it does for the "NO" check a few lines above.