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 Resin Server | Application Server (Java EE Certified) and Web Server

resin 4.0.23 release notes


4.0.23 continues focus on bug fixes and stability

Thanks to everyone who reported bugs in 4.0.22. We encourage people to report 4.0.23 bugs at

Health: PdfReport

The PdfReport now has a mail-to attribute which can be used to send the pdf report as an email attachment.

Example PdfReport
<resin ...>
  <cluster ...>

Health: AnomalyAnalysis

The health check system has some early anomaly analysis. The analyzer will look at a meter value, checking for deviations from the average value. So unusual changes like a spike in blocked threads can be detected.

Health: Watchdog and Postmortem

The Postmortem report has been renamed to be the watchdog restart report, primarily for translation purposes. We're now describing the watchdog as the entire check/restart/report system, where the watchdog process is only a part.

Command Line Interface

The "stop" and "kill" commands can be used without the -server option if the current watchdog has a single server active.


The WebSocket implementation has been upgraded to draft 16.

jCache and Performance

The jCache API has been upgraded (although that's a moving target.) Performance has been improved, particularly for caches with a low locality rate. The user key to internal hash key cache has been merged into the global manager and its size increased.

Experimental testing of Resin's cache used as a memcache server shows comparable performance with memcached on certain loads.

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