java.lang.NullPointerException when formatting pattern with MessageFormat class

Name: tb29552 Date: 08/27/97


The following fragment shows the exception thrown :

import java.text.*;

class Test {
    public static void main(String[] args) {
        String[] pattern = {"Message without param",
                            "Message with param:{0}",
                            "Longer Message with param {0}"};
        //difference between the two param strings are that
        //in the first one, the param position is within the
        //length of the string without param while it is not so
        //in the other case.

        MessageFormat messageFormatter = new MessageFormat("");

        //Apply pattern with param and print the result
        messageFormatter.applyPattern(pattern[1]);
        Object[] params = {new String("BUG")};
        System.out.println(messageFormatter.format(params));

        //Apply pattern without param and print the result
        messageFormatter.applyPattern(pattern[0]);
        System.out.println(messageFormatter.format(null));
             //This statement gives an exception while formatting...
             //If we use pattern[1] for the message with param,
             //we get an NullPointerException in MessageFormat.java(617)
             //If we use pattern[2] for the message with param,
             //we get an StringArrayIndexOutOfBoundsException in MessageFormat.java(614)
             //Both are due to maxOffset not being reset to -1
             //in applyPattern() when the pattern does not
             //contain any param.
    }
}


company - Aztec Software , email - ###@###.###
======================================================================