Using java.math.BigInteger in Nashorn / jjs?

[Sundararajan Athijegannathan]

Hi,

I initially that the recent fix by Hannes (see also: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-December/005762.html).would 
fix this issue as well. But, I applied patch by Hannes and verified that 
the issue is not fixed by that patch. I've filed a new bug:

https://bugs.openjdk.java.net/browse/JDK-8146264

Thanks,
-Sundar
**
On 12/29/2015 7:23 AM, Roland Bouman wrote:
> Please consider the concrete example of a Java function I would like to get
> working in Nashorn / jss javascript below:
>
>    public static BigInteger fibonacci(int n) {
>      BigInteger prev = new BigInteger("0");
>      if (n == 0) {
>        return prev;
>      }
>      BigInteger next = new BigInteger("1");
>      if (n == 1) {
>        return next;
>      }
>      BigInteger fib = null;
>      int i;
>      for (i = 1; i < n; i++) {
>        fib = prev.add(next);
>        prev = next;
>        next = fib;
>      }
>      return fib;
>    }
>
> We can test with these values:
>
> n=77: 5527939700884757
> n=78: 8944394323791464
> n=79: 14472334024676221
>
> So far so good. Now I try the - what I think is - equivalent function in
> javascript:
>
> function fibonacci(n) {
>    var BigInteger = Java.type("java.math.BigInteger");
>    prev = new BigInteger("0");
>    if (n == 0) return prev;
>
>    next = new BigInteger("1");
>    if (n == 1) return next;
>
>    var i, fib = null;
>    for (i = 1; i < n; i++) {
>      fib = prev.add(next);
>      prev = next;
>      next = fib;
>    }
>    return fib;
> }
>
> However, now we get different results:
>
> n=77: 5527939700884757
> n=78: 8944394323791464
> n=79: 14472334024676220
>
> Note that the value for n=79 is off by one.