Fix for JDK Double.parseDouble infinite loop

Mark Wielaard mark at klomp.org
Wed Feb 2 12:30:40 PST 2011


On Wed, 2011-02-02 at 20:02 +0000, Alan Bateman wrote:
> Andrew Haley wrote:
> > The post on
> > http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/ 
> >
> > describes a (on first sight) trivial bug when parsing strings into
> > Java Double objects.
> Thanks for the analysis and patch. We also have a fix from Dmitry 
> Nadezhin that he posted here some time ago (but fell through the cracks 
> for some reason). I expect this issue will be fixed soon.

Wow, I did some digging to find this. And it was reported back in 2001
(!): http://bugs.sun.com/view_bug.do?bug_id=4421494
There is even a suggested fix in the report.

Dmitry Nadezhin posted about it on the list in 2009:
http://mail.openjdk.java.net/pipermail/core-libs-dev/2009-November/003153.html

If people are looking into floating point issues now, it might be good
to also take a look at the other issues he mentioned in 2010 when he
proposed a Math subproject for OpenJDK:
http://mail.openjdk.java.net/pipermail/core-libs-dev/2010-January/003556.html

Cheers,

Mark



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