java.util.ConcurrentModificationException: This exception has no message.

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at java.util.HashMap$HashIterator.nextNode(
at java.util.HashMap$
at org.hibernate.resource.jdbc.internal.ResourceRegistryStandardImpl.releaseResources(
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.afterTransaction(
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.afterTransaction(
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.afterCompletion(
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.commit(
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(
at com.atlassian.hibernate.adapter.adapters.TransactionV2Adapter.commit(
at com.atlassian.confluence.impl.hibernate.ConfluenceHibernateTransactionManager.doCommit(

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