【发布时间】：2014-01-25 20:42:48
【问题描述】：
我评估了一些访问 neo4j (2.0.0) 的堆栈，并且对 spring (3.2.6) 有一些问题。我现在要实现的目标非常简单：连接图形并读取节点的单元测试。我的应用程序上下文如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:neo4j="http://www.springframework.org/schema/data/neo4j"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/data/neo4j
http://www.springframework.org/schema/data/neo4j/spring-neo4j.xsd">
<context:annotation-config />
<context:spring-configured />
<context:component-scan base-package="net.vhite.kin">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>
<tx:annotation-driven mode="proxy" />
<neo4j:config graphDatabaseService="graphDatabaseService" />
<bean id="graphDatabaseService"
class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase">
<constructor-arg index="0" value="http://192.168.201.2:7474/db/data" />
</bean>
</beans>
测试本身也很简单：
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"test-context.xml"})
public class NeoTest {
@Autowired
Neo4jTemplate template;
@Test
@Transactional
public void persistedMovieShouldBeRetrievableFromGraphDb() {
// still empty yet
}
}
创建应用程序上下文时运行此（空）测试失败。之前我设法解决了很多错误，主要是通过修复依赖关系树，但我不明白这一点。异常告诉我一个节点不可用——但我还没有发送任何查询！所以它与初始化有关。我不知道为什么。我用谷歌搜索了该跟踪中的每个异常，但没有找到好的提示。
我做的最后一件事是添加验证 api (1.1.0)。我将 spring 3.2.6 与 spring-data 3.0.0 一起使用，这可能是个问题吗？
[main] ERROR org.springframework.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@a1a139] to prepare test instance [net.vhite.kin.NeoTest@15fcf90]
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:312)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
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: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'nodeTypeRepresentationStrategy' defined in class org.springframework.data.neo4j.config.Neo4jConfiguration: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.core.TypeRepresentationStrategy org.springframework.data.neo4j.config.Neo4jConfiguration.nodeTypeRepresentationStrategy() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'typeRepresentationStrategyFactory' defined in class org.springframework.data.neo4j.config.Neo4jConfiguration: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory() throws java.lang.Exception] threw exception; nested exception is org.neo4j.graphdb.NotFoundException: Reference node not available
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:589)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1055)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:951)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:120)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:100)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:248)
at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:64)
at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:91)
... 27 more
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.core.TypeRepresentationStrategy org.springframework.data.neo4j.config.Neo4jConfiguration.nodeTypeRepresentationStrategy() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'typeRepresentationStrategyFactory' defined in class org.springframework.data.neo4j.config.Neo4jConfiguration: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory() throws java.lang.Exception] threw exception; nested exception is org.neo4j.graphdb.NotFoundException: Reference node not available
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:181)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:578)
... 44 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'typeRepresentationStrategyFactory' defined in class org.springframework.data.neo4j.config.Neo4jConfiguration: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory() throws java.lang.Exception] threw exception; nested exception is org.neo4j.graphdb.NotFoundException: Reference node not available
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:589)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1055)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:951)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:298)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e.typeRepresentationStrategyFactory(<generated>)
at org.springframework.data.neo4j.config.Neo4jConfiguration.nodeTypeRepresentationStrategy(Neo4jConfiguration.java:148)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e.CGLIB$nodeTypeRepresentationStrategy$1(<generated>)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e$$FastClassByCGLIB$$41a209a0.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:286)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e.nodeTypeRepresentationStrategy(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:160)
... 45 more
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory() throws java.lang.Exception] threw exception; nested exception is org.neo4j.graphdb.NotFoundException: Reference node not available
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:181)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:578)
... 66 more
Caused by: org.neo4j.graphdb.NotFoundException: Reference node not available
at org.neo4j.rest.graphdb.ExecutingRestAPI.getReferenceNode(ExecutingRestAPI.java:335)
at org.neo4j.rest.graphdb.RestAPIFacade.getReferenceNode(RestAPIFacade.java:108)
at org.neo4j.rest.graphdb.RestGraphDatabase.getReferenceNode(RestGraphDatabase.java:75)
at org.springframework.data.neo4j.support.typerepresentation.LabelBasedNodeTypeRepresentationStrategy.isStrategyAlreadyInUse(LabelBasedNodeTypeRepresentationStrategy.java:129)
at org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory.chooseStrategy(TypeRepresentationStrategyFactory.java:57)
at org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory.<init>(TypeRepresentationStrategyFactory.java:39)
at org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory(Neo4jConfiguration.java:153)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e.CGLIB$typeRepresentationStrategyFactory$16(<generated>)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e$$FastClassByCGLIB$$41a209a0.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:286)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$dd66ab5e.typeRepresentationStrategyFactory(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:160)
... 67 more
【问题讨论】：
-
我降级到 spring 3.0.0，得到另一个原因：原因：java.lang.NullPointerException at org.springframework.data.neo4j.support.DelegatingGraphDatabase.beginTx(DelegatingGraphDatabase.java:251)
标签： java spring neo4j spring-data spring-test