NoAvailableSessionException can occur during free text search combined in faceted navigation

For the gogreen, when hitting many free text searches at the same time, it sometimes happen that you get:

$ grep NoAvailableSessionException hippo-site.log 19.03.2012 14:29:21 WARN [org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeBeforeRender():151] Component exception caught on window content with component com.onehippo.gogreen.components.search.SearchComponent: org.hippoecm.hst.core.jcr.pool.NoAvailableSessionException: No session is available now. Probably the session pool was exhasuted. at org.hippoecm.hst.core.jcr.pool.BasicPoolingRepository.login(BasicPoolingRepository.java:319)

It can be triggered and reproduced much easier, even with the testsuite, when using the following hst-config.properties :

disposable.repository.maxActive = 500
disposable.repository.timeBetweenEvictionRunsMillis = 100
disposable.repository.numTestsPerEvictionRun = 1
disposable.repository.minEvictableIdleTimeMillis =100
disposable.repository.maxRefreshIntervalOnPassivate = 100
disposable.global.repository.timeBetweenEvictionRunsMillis = 100

I've on purpose set maxActive to 500 : This did not avoid the problem at all.

I think it might be caused by 'clearing up' the entire disposable pool at the same time that there is some request arriving that needs a session from that pool. However, I need some more HST debugging to fix the problem.

Apart from the 'no results' for one request and a WARNING log, it automatically recovers during the next request.