The WARNINGS below may appear in the logs after upgrading to UVWC 6.10.41 :
15-Sep-2020 23:00:12.581 WARNING [http-nio-8888-exec-3] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/jars/opencsv.jar] to the cache for web application [/univiewer] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
15-Sep-2020 23:00:12.582 WARNING [http-nio-8888-exec-3] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/jars/opencsv.jar] to the cache for web application [/univiewer] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
15-Sep-2020 23:00:12.594 WARNING [http-nio-8888-exec-2] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/jars/protobuf-java.jar] to the cache for web application [/univiewer] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
15-Sep-2020 23:00:12.594 WARNING [http-nio-8888-exec-2] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/jars/protobuf-java.jar] to the cache for web application [/univiewer] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
Those Warnings mean that Tomcat expects more cache available to work correctly.
The latest UVWC release needs more tuning on Tomcat.
Release : 6.10
Component : DOLLAR UNIVERSE
Upgrade the Caching on Tomcat using the value "cacheMaxSize" in conf/context.xml