tested java version:
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta3-b56)

TextMeasurer delete function will get exception if you try to delete more than one characters.

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(Native Method)
        at java.awt.font.TextMeasurer.deleteChar(TextMeasurer.java:721)
        at TextMeasureDeleteTest.main(TextMeasureDeleteTest.java:31)

It seems that source array index was set wrong if the deleted characters > 1.

See attached test case.

Sorry about it. I was getting bugtraq error, and try to resent the bug.