Neo4j 映射异常

Question

我在执行以下代码时遇到 MappingException 错误：

Configuration configuration = new Configuration.Builder()
                    .uri("file:///var/lib/neo4j/data/databases/graph.db")
                    .credentials("neo4j","noor")
                    .build();

            SessionFactory sessionFactory = new SessionFactory(configuration,"OntologyDescription","info.testNeo");
            Session session = sessionFactory.openSession();
            ResourceDescription classDescription = OntologyUtils.getClassDescription(classIRI,
                    dogont);
            session.save(classDescription);
            sessionFactory.close();

完整跟踪：

Exception in thread "main" org.neo4j.ogm.exception.core.MappingException: Field with primary id is null for entity state
    at org.neo4j.ogm.context.MappingContext.nativeId(MappingContext.java:514)
    at org.neo4j.ogm.context.EntityGraphMapper.newNodeBuilder(EntityGraphMapper.java:318)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:257)
    at org.neo4j.ogm.context.EntityGraphMapper.mapRelatedEntity(EntityGraphMapper.java:797)
    at org.neo4j.ogm.context.EntityGraphMapper.link(EntityGraphMapper.java:501)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntityReferences(EntityGraphMapper.java:414)
    at org.neo4j.ogm.context.EntityGraphMapper.mapEntity(EntityGraphMapper.java:265)
    at org.neo4j.ogm.context.EntityGraphMapper.map(EntityGraphMapper.java:149)
    at org.neo4j.ogm.session.delegates.SaveDelegate.lambda$save(SaveDelegate.java:89)
    at java.util.Collections$SingletonList.forEach(Collections.java:4822)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:89)
    at org.neo4j.ogm.session.delegates.SaveDelegate.save(SaveDelegate.java:51)
    at org.neo4j.ogm.session.Neo4jSession.save(Neo4jSession.java:468)
    at Examples.TestNeo4j.main(TestNeo4j.java:41)

我仅在从 OntologyUtils.getClassDescription 方法获取 classDescription 时收到错误。但是，如果我新实例化一个 ResourceDescription，我不会收到错误。简而言之，OntologyUtils.getClassDescription 调用其他几个方法来向新实例添加信息。

Answer 1

这个问题是因为包名包含大写字母。如本GitHub issue所述，包名应完全小写

Neo4j 映射异常

Neo4j Mapping Exception

neo4j

neo4j-ogm