Grails ehcache plugin - Another unnamed CacheManager already exists in the same VM

Question

I run my Grails application using ehcache for my 2nd level Cache and it works. I installed the ehcache plugin + cache plugin and then it doesn't. I tried almost all solutions from the internet and found no solution I keep getting Another unnamed CacheManager already exists in the same VM.

One of the possible solutions is to set p:shared=true in the EhCacheManagerFactoryBean, this works if I use an old plugin "springcache plugin from grails" but with the new plugin they use a modified version of this manager and the property shared is not available.

I tried defining a new ehcache.xml file but still I can not put inside a new name for this cache manager.

I tried changing the cache.provider class inside my DataSource.groovy to use one another EhCacheProvider such as a Singleton.

Needless to say, I tested putting a different name using DSL in different places but still no luck.

At the end I'm using the old plugin for spring cache which is deprecated. Can anybody help?

I'm using Grails 2.0.3 and ehcache-core:2.5.3.

Answer 1

In the hibernate section of DataSource.groovy, make sure your cache.provider.class is up to date:

hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = true
    cache.region.factory_class = 'grails.plugin.cache.ehcache.hibernate.BeanEhcacheRegionFactory' // For Hibernate before 4.0
    cache.region.factory_class = 'grails.plugin.cache.ehcache.hibernate.BeanEhcacheRegionFactory4' // For Hibernate before 4.0 and higher
}

I had the same problem because my cache.region.factory_class was outdated: net.sf.ehcache.hibernate.EhCacheProvider.

See http://grails-plugins.github.io/grails-cache-ehcache/guide/usage.html

Answer 2

For those having this error with Grails 2.5.x, just add this to Config.groovy :

beans {
   cacheManager {
      shared = true
  }
}

This solved the problem for me.

source : https://github.com/grails/grails-core/releases/tag/v2.5.0

Answer 3

Try to use cache & cache-ehcache plugins, it works for me with some limitations. But for 2ndlevel Cache it work correctly

Answer 4

For people arriving here getting the same error as OP might consider that error might be caused by an update of a domain class at runtime (hot code swap), which is not done nicely in alle versions of Grails.

I hit this bug with Grails 2.5.4, yet with the application restart button as the only option to solve.