Methos generate in org.hibernate.id.enhanced.OptimizerFactory$PooledLoOptimizer classs is not synchronized ----------------------------------------------------------------------------------------------------------- Key: HHH-5872 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5872 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.6.0, 3.6.0.CR2, 3.6.0.CR1, 3.5.6, 3.6.0.Beta4, 3.6.0.Beta3, 3.5.5, 3.6.0.Beta2, 3.6.0.Beta1, 3.5.4, 3.5.3, 3.5.2 Environment: Hibernate 3.5.6-Final, Oracle 11g, WebSphere 6.1 cluster Reporter: Tchavdar Roussanov Receiving multiple primary key constraint violation exceptions when using SequenceStyleGenerator with optimizer parameter set to pooled-lo. Looking into the source code I found that the generate mathod for the new PooledLoOptimizer is not synchronized. After switching to PooledOptimizer (which has synchronized generate method) every thing works fine. -- 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