The following similar exceptions I'm getting in my log files frequently. Afterwards server itself wont accept any data and sync services are not working, even for valid Userlogin credentials.
Can anyone suggest me what will be the cause for it and how can I resolve it.?
---- exception report ----------------------------------------------------------
Failure in findOne operation for entity [UserLogin]: org.ofbiz.entity.transaction.GenericTransactionException: The current transaction is marked for rollback, not beginning a new transaction and aborting current operation; the rollbackOnly was caused by: Failure in create operation for entity [InvoiceAttribute]: org.ofbiz.entity.GenericEntityException: Error while inserting: [GenericEntity:InvoiceAttribute]
Environment : Ubuntu 14.04
Database : MySql v5.6