On 6/21/23 03:19, Simon Matter wrote:

On 6/15/23 00:41, Jerry Malcolm wrote:

On 6/13/2023 3:46 PM, Jerry Malcolm wrote:

On 6/13/2023 12:39 PM, Jerry Malcolm wrote:

On 6/13/2023 11:34 AM, Rob Sargent wrote:
In /etc/rc.local I have:

sleep 120s
systemctl start tomcat9


I put the sleep in back a couple of years ago that for some reason
'fixed' this same random, intermittent crypto file exception.

One observation.... even though the error doesn't show up in the log
until my first db call, I think the real error has to be occurring
during tomcat boot.  If the failure occurs, I continue to get the same
"Can't read cryptographic policy directory: unlimited" even hours
later after boot every time I send another request to TC.  If I then
reboot TC and this time I don't get the failure, that unlimited folder
magically becomes available.  There is something happening in TC boot
with some sort of crypto initialization that either succeeds or
fails.  And the exception when trying to get connections long after TC
boot is just hitting whatever problem occurred during boot.  In other
words, delaying my calls, even for hours, has no effect on accessing
that folder if the problem is present.  Rebooting TC gives it another
chance to succeed or fail. Any ideas what TC could be doing on boot
that could lock up that folder?

I never really found a definitive fix for this.  But after all of the
research and logging and everything, I pretty much concluded that
there's some kind of timing/race condition between Tomcat boot and Java
crypto initialization.  Given that, I figured it was highly unlikely
that two different Java JVM implementations would have the same precise
implementation code to trigger that race condition.  So as a last ditch
effort, I replaced my OpenJDK JVM for Tomcat with Amazon's Corretto Java
JVM.  It's circumstantial evidence at best, and running a production
environment on fixes that just went away goes against my grain. But if
the problem goes away, maybe it won't come back. At this time, when
using Corretto JVM, I have not encountered the Crypto directory error.
It's been running on all server instances now for almost 24 hours with
no problems.  So I guess my suggestion to anyone else that might
encounter something like this, trying using a different JVM from a
different provider.  That appears at this time to have worked for me.

Yeah, that's certainly a very unsatisfying result, but ... you can't
argue with results. I'd love to hear if you end up with any further


I was asking this before and ask again, how do we know it's not a missing
RNG entropy while the crypto stuff of the Java VM is initialised?

Because the symptoms of *that* problem (very long lags when requesting random numbers) are not being experienced. And also because the error message is crystal clear:

Caused by: java.lang.SecurityException: Can not initialize cryptographic mechanism at java.base/javax.crypto.JceSecurity.<clinit>( ... 86 mo Caused by: java.lang.SecurityException: Can't read cryptographic policy directory: unlimited at java.base/javax.crypto.JceSecurity.setupJurisdictionPolicies(

The cryptographic provider itself cannot even initialize. It's *way* before any randomness is needed. The "unlimited" directory is presumably the directory which contains the policy files which do not impose the archaic US-imposed "export restrictions" on cryptographic primitives. The Provider cannot find the configuration directory, and fails.


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