JVM DNS cache flush

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Sideswipe - 07 Nov 2007 19:38 GMT

I am told that the JVM maintains it's own DNS Caching and eschews the
OS cache for DNS.

Is that true?

If it is, then the follow-up question is how can I flush it?

I know I can set the TTL for the cache with a system property which
leads me to suspect I might be able to flush it as well.

Can anyone shed some light on this?

Christian
http://christian.bongiorno.org

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Gordon Beaton - 07 Nov 2007 19:58 GMT

> I am told that the JVM maintains it's own DNS Caching and eschews
> the OS cache for DNS.
[quoted text clipped - 5 lines]
> I know I can set the TTL for the cache with a system property which
> leads me to suspect I might be able to flush it as well.

Have you not read the API documentation for InetAddress? Properties
networkaddress.cache.ttl and networkaddress.cache.negative.ttl are
described there.

/gordon

--

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Sideswipe - 30 Nov 2007 23:02 GMT

> > I am told that the JVM maintains it's own DNS Caching and eschews
> > the OS cache for DNS.
[quoted text clipped - 13 lines]
>
> --

My very post says I already know I can set the System properties on
the TTL.

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Roedy Green - 07 Nov 2007 20:42 GMT

On Wed, 07 Nov 2007 19:38:05 -0000, Sideswipe
<christian.bongiorno@gmail.com> wrote, quoted or indirectly quoted
someone who said :

>If it is, then the follow-up question is how can I flush it?

I don't know if you can flush it, but you can control its time to
live.
see http://mindprod.com/jgloss/ip.html#OTHERIP