Problem

There are excessive WARNINGs in catalina.out related to Cache Management.

The following repeatedly appears in the catalina.out

"WARNING [http-nio-8090-exec-3] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/xxxxx/xxxx/xxxxx.xxx]
 to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache"

Diagnosis

Environment

• This behaviour occurs regardless of the environment

Possible Cause

There is new implementation of WARNINGs in Tomcat 8 while in Tomcat 7 does not record these warnings. 

if (newSize > maxSize) {
      // Unable to create sufficient space for this resource
      // Remove it from the cache
      removeCacheEntry(path);
      log.warn(sm.getString("cache.addFail", path));
  }

Resolution

This issue is fixed in Confluence 6.0.2

• CONFSERVER-39368 - Getting issue details... STATUS

Workaround

Suppress cache log warnings

At the moment, these WARNINGs are harmless.  To reduce the noise level of these WARNINGs:

1. Go to Administration >> Logging and Profiling
2. Set the logging level to ERROR for org.apache.catalina.webresources.Cache
   
   1. If the class does not exists, please add the class to the list