我尝试在 Spring Data Neo4j 4.0.0RC1 实体上使用 Jackson 2.x 注释，但在我的应用程序上下文启动中看到失败。我有两个@NodeEntities实现一个接口，我已经对接口进行了注释：
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
@JsonSubTypes({
@Type(value = SimpleNode.class, name="simple"),
@Type(value = OtherNode.class, name="other")
})
public interface Node {
}
我相信这是正确的用法，但是当我启动应用程序时，由于创建 Neo4j 会话工厂时出现问题，Spring 上下文无法加载。
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getSessionFactory' defined in class path resource [com/example/TestApplication$Neo4jConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'getSessionFactory' threw exception; nested exception is java.lang.ClassFormatError: Invalid annotation element type tag: 0x0
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1119) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1014) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:322) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at com.example.TestApplication$Neo4jConfig$$EnhancerBySpringCGLIB$$e5734e5.getSessionFactory(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na]
at org.springframework.data.neo4j.config.Neo4jConfiguration.getSession(Neo4jConfiguration.java:49) ~[spring-data-neo4j-4.0.0.RC1.jar:na]
at com.example.TestApplication$Neo4jConfig$$EnhancerBySpringCGLIB$$e5734e5.CGLIB$getSession$12(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na]
at com.example.TestApplication$Neo4jConfig$$EnhancerBySpringCGLIB$$e5734e5$$FastClassBySpringCGLIB$$a7919784.invoke(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:309) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at com.example.TestApplication$Neo4jConfig$$EnhancerBySpringCGLIB$$e5734e5.getSession(<generated>) ~[spring-core-4.1.6.RELEASE.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_45]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_45]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_45]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 94 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.neo4j.ogm.session.SessionFactory]: Factory method 'getSessionFactory' threw exception; nested exception is java.lang.ClassFormatError: Invalid annotation element type tag: 0x0
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 115 common frames omitted
在玩弄我的配置时，我能够确定 OGM 代码（版本 1.1.0）似乎被@JsonSubTypes。如果我用抽象类替换接口，也会发生此错误。最后，我注意到org.neo4j.ogm.metadata.info.AnnotationsInfo构造函数（第 89 行）有一个 TODO 说// todo: maybe register just the annotations we're interested in.
我的问题是：
- 有一个优雅的解决方法吗？我认为多态反序列化并不是一个完全不常见的用例？
- 我对 Jackson 注释的使用正确吗？
这很可能是解决的问题https://jira.spring.io/browse/DATAGRAPH-674
它将在 neo4j-ogm 1.1.1 中提供，但在发布之前，您可以使用快照版本 1.1.1-SNAPSHOT
您还需要包含快照存储库 -
<repository>
<id>neo4j-snapshots</id>
<url>http://m2.neo4j.org/content/repositories/snapshots</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
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