Question

我一直在尝试使用enforceTargetType参数来区分基于结束节点类型的关系，但是收到了llegalStateException。

我使用了spring-data-neo4j verbatim提供的示例：（http://docs.spring.io/spring-data/neo4j/docs/current/reference/html/#reference_programming_model_relationships_relationshiptypediscrimination）

我的节点实体类是：

@NodeEntity
class Person {  

    @GraphId
    private Long id;    

    @RelatedTo(type="OWNS", enforceTargetType=true)
    Car car;

    @RelatedTo(type="OWNS", enforceTargetType=true)
    Pet pet;

}

@NodeEntity
public class Car {  

    @GraphId
    private Long id;

    @RelatedTo(type="OWNS", enforceTargetType=true, direction=Direction.INCOMING)
    Person person;
}

@NodeEntity
public class Pet {

    @GraphId
    private Long id;

    @RelatedTo(type="OWNS", enforceTargetType=true, direction=Direction.INCOMING)
    Person person;
}

测试类：

public class TestPerson  {

    @Autowired Neo4jTemplate neo4jTemplate;

    @Test public void testPerson (){
        Person pers = new Person();
        Car car = new Car();
        Pet pet = new Pet();

        pers.car = car;
        pers.pet = pet;

        neo4jTemplate.save(pers);   

    }

}

我收到以下异常：

java.lang.IllegalStateException: Could not read type 'Pet' - type does not exist
    at org.springframework.data.neo4j.fieldaccess.RelationshipHelper.removeMissingRelationshipsInStoreAndKeepOnlyNewRelationShipsInSet(RelationshipHelper.java:85)
    at org.springframework.data.neo4j.fieldaccess.RelatedToFieldAccessor.removeMissingRelationships(RelatedToFieldAccessor.java:73)
    at org.springframework.data.neo4j.fieldaccess.RelatedToSingleFieldAccessorFactory$RelatedToSingleFieldAccessor.setValue(RelatedToSingleFieldAccessorFactory.java:67)
    at org.springframework.data.neo4j.fieldaccess.DefaultEntityState.setValue(DefaultEntityState.java:113)
    at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.setEntityStateValue(SourceStateTransmitter.java:70)
    at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.access$100(SourceStateTransmitter.java:40)
    at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter$4.doWithAssociation(SourceStateTransmitter.java:113)
    at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:207)
    at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyPropertiesTo(SourceStateTransmitter.java:109)
    at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.write(Neo4jEntityConverterImpl.java:150)
    at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister$CachedConverter.write(Neo4jEntityPersister.java:179)
    at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:243)
    at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:231)
    at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:293)
    at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:287)
    at com.poc.neo4j.person.TestPerson.testPerson(TestPerson.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.test.context.junit4.SpringTestMethod.invoke(SpringTestMethod.java:198)
    at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod(SpringMethodRoadie.java:274)
    at org.springframework.test.context.junit4.SpringMethodRoadie$2.run(SpringMethodRoadie.java:207)
    at org.springframework.test.context.junit4.SpringMethodRoadie.runBeforesThenTestThenAfters(SpringMethodRoadie.java:254)
    at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:234)
    at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:204)
    at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:146)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:151)
    at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
    at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
    at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassNotFoundException: Pet
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at org.springframework.data.neo4j.fieldaccess.RelationshipHelper.removeMissingRelationshipsInStoreAndKeepOnlyNewRelationShipsInSet(RelationshipHelper.java:81)
    ... 38 more

如果我将Person-＆gt; Pet和Person-＆gt; Cat重新关联他们自己的关系类型而不是两者都使用OWNS，这个问题就会消失

任何帮助表示赞赏...

Answer 1

我升级到最新版本的spring-data-neo4j，它解决了这个问题。感谢您的帮助。

enforce Target Type参数导致illegalStateException

1 个答案: