The method java.text.DecimalFormat.getMaximumIntegerDigits() returns INTEGER.MAX_VALUE while the spec states that return value should be at last 309:
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    Gets the maximum number of digits allowed in the integer portion of a number. For formatting numbers other than BigInteger and BigDecimal objects, the lower of the return value and 309 is used.
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You may reproduce it using following program:

import java.text.DecimalFormat;

public class T {
    public static void main(String[] args) {
        DecimalFormat df = new DecimalFormat();

        String patterns[] = {"000.00", "###0.###", "##,###.0", "000,000.000", "prefix#suffix", "prefix", "#0,00000.00;00.0" };
        for (int i = 0; i < patterns.length; i++) {
            df.applyPattern(patterns[i]);
            System.out.println("applyPattern(String pattern) fails with pattern \"" + patterns[i] + "\"");
            System.out.println(" getMaximumIntegerDigits() returns " + df.getMaximumIntegerDigits());
        }
    }
}