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java.util.ConcurrentModificationException: null at java.util.HashMap$HashIterator.nextNode( at java.util.HashMap$ at org.neo4j.ogm.context.MappingContext.clear( at org.neo4j.ogm.context.MappingContext.clear( at org.neo4j.ogm.session.delegates.DeleteDelegate.deleteAll( at org.neo4j.ogm.session.Neo4jSession.deleteAll( at