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[grouper-users] LDAP timeouts after Java upgrade

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  • From: Baron Fujimoto <>
  • To: Grouper Users <>
  • Subject: [grouper-users] LDAP timeouts after Java upgrade
  • Date: Mon, 27 Apr 2020 15:27:51 -1000

We're running Grouper 2.2.2 with LDAP (389DS) as a subject source. We were
previously using Java 1.0.8_212 successfully. However, I recently upgraded
the instance to use the current version of Java (251), and after doing so
noticed that while it initially appears to work as expected, the LDAP
connections eventually begin to time out with the following error:

javax.naming.NamingException: LDAP response read timed out, timeout used:-1ms

The timeouts start to occur after ~20 minutes. Netstat shows no open
connections to our LDAP at that point.

The grouper host is actually a node in a cluster behind a load balancer, but
our lb admins can't find any relevant ~20 minute timeout value there.

I've empirically determined that this appears to happen with a version of
Java 8 higher than 221 (i.e. 231, 241, 251). I dodn't see anything in the JDK
release notes for 231 that appear to be relevant.

Any suggestions or ideas would be appreciated.

UH Information Technology Services : Identity & Access Mgmt, Middleware
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