Comments on: Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty

By: Raja

Raja — Fri, 17 Feb 2012 03:49:51 +0000

Thanks a lot Usn.
It clearly saved atleast a week of debugging..

By: usn

usn — Tue, 08 Nov 2011 10:50:20 +0000

Hi, I think the only difference is the wrong syntax. :)
file:///dev/urandom is just the way how to specify a file here.

By: Mahesh

Mahesh — Thu, 03 Nov 2011 11:56:08 +0000

What is difference between file:/dev/urandom and file:///dev/urandom.
I was using file:/dev/urandom but was still facing problem. The later looks like solving my problem till now, but not sure yet. Have to test more.

Thanks.

By: Viktor

Viktor — Wed, 26 Oct 2011 09:39:16 +0000

Great post! Had the same problem when starting more Instances paralled on a WebObjects Monitor /dev/urandom solved my problem!

Thank you!!!

By: gdq

gdq — Fri, 23 Sep 2011 13:20:02 +0000

Had a similar poblem when moving a tomcat from one server to an other; when tomcat started deploying the apps on the new server it hanged with a last log line:

FINE: Force random number initialization starting

First solved it by specifying a session handler and random class in context.xml (used default values), but with the option mentioned above, could leave out the context.xml

Thanks for the info!

By: Rick-Rainer Ludwig

Rick-Rainer Ludwig — Fri, 16 Sep 2011 22:07:48 +0000

Thank you very much for your blog entry! I was puzzling around for the last week to find out why unit tests broke by time out. An excessive logging and log file reading brought me to network connection and later to the database connection and JDBC aka. ojdbc5. With that information at hand I came to your blog and I got the solution. Thanks, again! Awesome information! It worked for me, too.

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By: Philipp

Philipp — Fri, 09 Sep 2011 09:46:04 +0000

Agree with Andrew! Strange Problem, nice Blog Post! Thanks a lot!

By: Andrew

Andrew — Wed, 31 Aug 2011 18:15:05 +0000

Great post. Ran into this issue and have no idea how long it would have taken to figure this out had I not found this blog entry.

By: JB

JB — Fri, 26 Aug 2011 18:58:03 +0000

Per your recommendation, I installed an older fan right above the server next to a micrphone. This is opposed to new Dyson Air Multipliers. We all know that only the wind buffeting caused by the blades will truly engage a random pattern that will allow the entropy daemon to capture the wave patterns properly. By having a bad bearing the noise pattern although repeatable was just random enough to get the entropy daemon garbage cleanup done properly – but occasionally I still lost connections; especially to system 10G. So I then installed a parrot on top of the fan and had it fed my a datacenter troll (DCT – we call him Ed) at random times throughout the day. In effect when the parrot took a poop the random noise of the **** hitting the fan resolved all my connection issues. Including 10G!! You can imagine how happy my manager was to have the end of entrophy issues!! However, every now and then I walk into the data cenetr and he has the parrot on his shoulder pretending to be Captain Morgan. He’s always striking that silly pose with his foot on the barrel. To resolve this I put a honey badger in a parrot suit on top the fan – sure enough the random feedings stopped the random lost connections again. However, one day my manager came in with cuts all over his face. I asked him what the heck happened? He said he was making sure the **** hit the fan, but when it (the ****) looked different he was concerned for Polly (a fore mentioned parrot). When I told him it was really a honey badger we all had a good laugh, and to date we wonder at how when the **** hits the fan things work properly. Frankly when things hang we still ask “Is the **** hitting the fan?” Around here – most of the time it is. Thanks again for the help. Damn it Ed – what the hell are you doing go feed Polly. Geeze. I need to outsource him – slacker.

COMMENT FROM USN:
No clue who this clown is. If it’s spam, its really worth reading it. :)
Usn