Nicolas Gillet [http://community.jboss.org/people/Ghurdyl] replied to the discussion "Unable to acquire lock on Fqn error" To view the discussion, visit: http://community.jboss.org/message/533260#533260 -------------------------------------------------------------- Hello, I allow myself to revive the topic as we have the same problem and can't find a solution. We are using Jboss Cache 3.2.1 to store and retrive picture encapsulated in an HttpResponse. We have this problem when trying to use JDBCCacheLoader (on a SQL Server database) instead of FileCacheLoader. The lock configuration is as follow : <locking     isolationLevel="READ_COMMITTED"     lockAcquisitionTimeout="10000"     nodeLockingScheme="mvcc"     writeSkewCheck="false"     concurrencyLevel="1000" /> But few trials to change these values don't significatly affect the behaviour. The error "+org.jboss.cache.lock.TimeoutException: Unable to acquire lock on Fqn [/command_image/style_20/root/3/2/2/2] after [10000] milliseconds for requestor [Thread[http-8080-49,5,main]]! Lock held by [null]+" comes when doing stress test on the cache (100 requests in 10 sec repeted 10 times with JMeter) The error comes more likely after a while, the first requests use to pass sucessfullly. The application that uses JBoss Cache used an earlier version (1.4) before I upgraded it so I may have forgotten something in the migration. I am new in the JBoss Cache's world so I can have forgotten something very obvious. Thanks for any help. Nicolas. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/533260#533260] Start a new discussion in JBoss Cache at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]