The method:   java.text.DigitList.fitsIntoLong()

throws ArrayIndexOutOfBoundsException

There is negative indexing occurs to an array that may have no elements:

java.lang.ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException
        at java.text.DigitList.fitsIntoLong(DigitList.java:173)
        at java.text.DecimalFormat.parse(DecimalFormat.java:817)
        at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1201)
        at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:730)
        at java.text.DateFormat.parse(DateFormat.java:322)
        at org.apache.catalina.servlets.DefaultServlet.checkIfHeaders(DefaultSer
vlet.java:754)
        at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServ
let.java:1100)
        at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java
:520)
	.
	.

The code on the JDK 1.3.1.02 (where this happens): is as follows:

    /**
     * Return true if the number represented by this object can fit into
     * a long.
     * @param isPositive true if this number should be regarded as positive
     * @param ignoreNegativeZero true if -0 should be regarded as identical to
     * +0; otherwise they are considered distinct
     * @return true if this number fits into a Java long
     */
    boolean fitsIntoLong(boolean isPositive, boolean ignoreNegativeZero)
    {
        // Figure out if the result will fit in a long.  We have to
        // first look for nonzero digits after the decimal point;
        // then check the size.  If the digit count is 18 or less, then
        // the value can definitely be represented as a long.  If it is 19
        // then it may be too large.

        // Trim trailing zeros.  This does not change the represented value.
        while (count > 0 && digits[count - 1] == (byte)'0') --count;


'count' is initialized to zero, there is no prior check whether digits has
been initialized, nor what the value of 'count' is.