Why does tomcat hang

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Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. It has not happened on a 1 processor system, with either Linux or Windows. I can force the hang to happen fairly reliably if I run tests to bombard the server with http requests several per second. According to logs it happens after the end of processing one request and before the beginning the next.

It is apparently not within application code, unless it's a finalizer. I have run a higher priority daemon thread in same JVM that just writes the time to a log file, and it hangs at the same time, so it could be the JVM that's hanging, or whatever does the real threading. Mostly, but not always, 'top' shows the 'java' process using I figured it was getting overwhelmed by my Office and Mac OS updates going out.

We know it is happening when Self Service cannot connect on Macs and iPads. Master JSS is still functioning normally.

One was related to tomcat memory. Tomcat's defaults aren't good enough. Java 1. Now using 5. I've found it pays immensely to keep to JAMF's recommended versions. Above or below causes issues, which I learnt the hard way.

I automated a lot of this in my JSS in a Box script. The relevant section of code you can find here along with a bunch of server.

We had similar issues in the past maybe once per year Being tired of this, we have configured JMX monitoring for the JSS Tomcat instance with "controlRole" , and now start "jconsole" during few days before and after an upgrade, to see how trends change over the time. I attached a graph after we upgraded to 9.