Do you know any issues with Java, DNS and AppEngine.

If I run java app on non google appengine and my app will use app
engine app as web service.

e.g. http://myapp2475687236458.appspot.com

Have any one experienced problem that google will update DNS for
myapp2475687236458.appspot.com domain and Java will cache it and use
old IP.

I had such problems with S3 before.  Some libraries cache DNS results
and Java it self caches DNS.

Amazon very often change IP for buckets. So I noticed it while
benching my app.

Is it advised to use dnsjava or similar package from beginning or
nobody experienced such problems with app engine?

Cheers,
Max
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