Here's a discussion on the subject:
<http://www.velocityreviews.com/forums/t141739-max-length-of-a-string.html>

In your case, it's probably not enough available memory, or some bug in
your code.

On Mon, 27 Jul 2009 00:44:07 -0700 (PDT), "Aryeh M. Friedman"
<Aryeh.Friedman@gmail.com> wrote, quoted or indirectly quoted someone
who said :

Strings are just char[] internally. So the limit is 32k elements, but
on a 32 bit JVM you will run out of RAM first.

I suggest you pepper your code with asserts or prints of the string
length to figure out where it is being chopped.

There may be some limit imposed by your OS on console I/O.  Try
writing to a file.

see http://mindprod.com/applet/fileio.html
for how to write the code.

Besides was has already been mentioned: Keep in mind that if longString
is a very long String, the following piece of code will not free any
(significant amount of) memory:

  String shortString = longString.substring(offset, shortLength),
  // then throw away all references to longString and have it gc'ed.

This is because shortString will still reference the same char[] array
that is also used by longString. Don't know whether this applies in your
case, but it is a common problem if you deal with long strings of which
you keep only small substrings. (At least this was the case in, I think,
Java 1.4. It may have been changed meanwhile, but I don't think so.)

Anyway I would expect Java to throw an exception rather than silently
truncating your string.

Cheers,
Simon

It's something weird.

Try this:

public class StringLength {
    public static void main(String... args) {
        final int size = 1000;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < size; ++i) {
            sb.append('!');
        }
        String s = sb.toString();
        System.out.println(s.length());
    }
}

I suspect that the string isn't really being truncated, but something
that's printing it is cutting it off at ~900 characters for some reason.
Tell us more about what's happening in your code, and we might be able to
suggest what the problem really is.

tom