Environment: Headless Linux server Red Hat Enterprise Linux Server release 6.7 (Santiago) 2.6.32-573.12.1.e16.x86_64
I have a java(7) program that I run from command line that spawns multiple threads and hits a oracle database simultaneously using ojdbc7.
Intermittently I see connection reset error:
Could not get JDBC Connection; nested exception is java.sql.SQLRecoverableException: IO Error: Connection reset
exactly as reported here and resolved here.
I tried the following to mitigate the issue:
Add these variations to my command line
- -Djava.security.egd=file:///dev/urandom
- -Djava.security.egd=file:/dev/../dev/urandom
- -Djava.security.egd=file:/dev/./urandom
Tried adding to java.security file
- securerandom.source=file:///dev/urandom
- securerandom.source=file:/dev/../dev/urandom
- securerandom.source=file:/dev/./urandom
Also tried ojdbc6
But I still see the issue. Which means that even with urandom in use, still there is not enough realtime entropy. Which is understandable, because when I run my java program, everything else is stopped (this is a application server with multiple running jvms, usually. )
I am wondering if there is anything I can do to 'cause' entropy on the server. I have limited access to this server so I am limited in what I can do. This java job is expected to run for a couple of hours, so I can not keep typing on the keyboard etc. May be run a simple program in the background that 'does' something?
Any ideas? I tried rngd command but apparently I do not have permission to use it. Any help greatly appreciated, been stuck with this issue for a while now.
Edit: I tried to run another java program (using java.awt.Robot) that simulates Keyboard presses continuously during my original program run, but due to limited permissions on the server I wasn't able to get it working. But in general, would that be a good way to ensure some entropy?
