Use a ConcurrentMap in the default impl in PersistenceProviderResolverHolder ---------------------------------------------------------------------------- Key: EJB-452 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-452 Project: Hibernate Entity Manager Issue Type: Sub-task Reporter: Emmanuel Bernard -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira