Have you configured the custom server setting called MxObjectCacheMaxEntriesLocalHeap? If so, remove that setting and any others related to caching. A number of fixes related to caching were done in Mendix 4.8.0 and higher that should make using these settings obsolete.
*Edit: If this doesn't help, I don't really know what could be the problem. Do you have any custom logging configuration that could override the Mendix default settings? Even though this is a warning, it's not really a problem and is usually surpressed by Mendix.
We are also getting this error about Ehcache 2.0 and we like to know if you solved this issue yet? I can't provide more information about the subject, only that this MxObjectCacheMaxEntriesLocalHeap is not configured so it should be something else...
Thanks in advance for your response.