I'm using ehcache as my second level cache for hibernate.
I would like to obtain statistics as to the size of each cache I have configured in my ehcache.xml.

I thought I could obtain access to such information via the CacheManager, but when I try to get an instance of CacheManager by:

CacheManager.getInstance()

This generates the following stack trace:
Exception in thread "CacheMonitor"
net.sf.ehcache.CacheException: Cannot parseConfiguration CacheManager. Attempt to create a new instance of CacheManager using the diskStorePath "null" which is already used by an existing CacheManager.
The source of the configuration was classpath.
at net.sf.ehcache.CacheManager.configure(CacheManager.java:248)


I didn't think it would/should try to create a new instance of CacheManager, as one must have been instantiated at startup.

As a side note/question - has anyone been able to get ehcache-1.2.3 working with hibernate 3.2 ?

-Mike

Ehcache 1.2.3 works well with Hibernate 3.2 over here.

By default, hibernate uses an instance cache (not a static cache) with Ehcache (that's changed recently). You can either use the Singleton provider from Ehcache, or you can use the Hibernate cache statistics (which are somewhat shallow, but are from JMX), or you can dig out the backing cache from the SessionFactory.

Ehcache is also working on a JMX bean to monitor statistics.

Thanks !