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java.util.ConcurrentModificationException: null at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$ValueIterator.next(HashMap.java:1458) at org.neo4j.ogm.context.MappingContext.clear(MappingContext.java:222) at org.neo4j.ogm.context.MappingContext.clear(MappingContext.java:199) at org.neo4j.ogm.session.delegates.DeleteDelegate.deleteAll(DeleteDelegate.java:96) at org.neo4j.ogm.session.Neo4jSession.deleteAll(Neo4jSession.java:354) at org.springframework.data.neo4j.template.Neo4jTemplate.deleteAll(Neo4jTemplate.java:183)