Hi all,
in Groovy we have now the second case of someone discovering a bug that
seems to be not a groovy bug. It seems to happen only on windows with a
64bit environment. This makes it difficult to reproduce, since not many
people bother with that it seems. So I am asking here for people to
confirm the problem and maybe helping me to reducing the sample code.
Anyway, the bug is reported with several 64bit VMs.. namely 1.6.0u13 and
1.6.0u11 or 12. A 32bit VM and the code works without problems. starting
the program with -Xint and the problem goes away for 64bit too. Also
Groovy 1.6.3 is required for this example, but I think any 1.6 Groovy
will do... maybe even before. The sample is a groovy program:
> def binstr = { v, n=4 ->
> def s = ("0"*n + Integer.toBinaryString(v))
> return s.substring(s.size()-n)
> }
>
> def uniqcols = { a, b, cols=4 ->
> def l = [] as HashSet
> 0.upto(cols-1) { bitno ->
> def bitmask = 1<<bitno
> switch (bitno) {
> case 0 : valu = ((a&bitmask) << 1) | (b&bitmask)
> break
> default : valu = ((a&bitmask) >> (bitno-1)) | ((b&bitmask) >> bitno)
> break
> }
> l << valu // add value to set
> }
> // println l
> return l.size()
> }
>
> 3.upto(8) { n ->
> def lastval = 2**n - 1
> def spacefill = " "*(n+1)
> def fmtstr = "%${n}d "
> println "${fmtstr}"
>
> def File file = new File("k2m${n}.txt")
> def PrintWriter writer = file.newPrintWriter()
>
> // heading
> writer.print spacefill
> 0.upto(lastval) { i -> writer.print "${binstr(i,n)} " };
> writer.println ""
>
> // data lines
> 0.upto(lastval) { i ->
> writer.print "${binstr(i,n)} "
> 0.upto(lastval) { j ->
> writer.print String.format(fmtstr, n-uniqcols(i,j,n))
> }
> writer.println ""
> }
> writer.close() // files 3 to 5 empty without this!
> }
what fails is the String.format call, that deep down in Groovy will call
a System.arraycopy, which then fails with a ArrayOutOfBoundsException,
without any further explanation about what happened. A clear error
message would have helped to identify the problem already, but VM error
messages have never been very detailed.
So anyway how can assist here?
bye blackdrag
--
Jochen "blackdrag" Theodorou
The Groovy Project Tech Lead (http://groovy.codehaus.org)
http://blackdragsview.blogspot.com/
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