Question

我正在尝试升级到Neo4j 2.0和Spring Data 3.0。在我的任何代码执行之前，我在应用程序启动时得到一个空指针。

Caused by: org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement MATCH (ref:ReferenceNode {name:{name}}) RETURN ref; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement MATCH (ref:ReferenceNode {name:{name}}) RETURN ref; nested exception is java.lang.NullPointerException
at org.springframework.data.neo4j.support.query.CypherQueryEngine.query(CypherQueryEngine.java:56)
at org.springframework.data.neo4j.support.ReferenceNodes.executeQuery(ReferenceNodes.java:77)
at org.springframework.data.neo4j.support.ReferenceNodes.getReferenceNode(ReferenceNodes.java:81)
at org.springframework.data.neo4j.support.typerepresentation.SubReferenceNodeTypeRepresentationStrategy.isStrategyAlreadyInUse(SubReferenceNodeTypeRepresentationStrategy.java:95)
at org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory.chooseStrategy(TypeRepresentationStrategyFactory.java:56)
at org.springframework.data.neo4j.support.typerepresentation.TypeRepresentationStrategyFactory.<init>(TypeRepresentationStrategyFactory.java:39)
at org.springframework.data.neo4j.config.Neo4jConfiguration.typeRepresentationStrategyFactory(Neo4jConfiguration.java:146)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$4b018b97.CGLIB$typeRepresentationStrategyFactory$6(<generated>)
at org.springframework.data.neo4j.config.Neo4jConfiguration$$EnhancerByCGLIB$$4b018b97$$FastClassByCGLIB$$5306fd26.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$$EnhancerByCGLIB$$4b018b97.typeRepresentationStrategyFactory(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:160)
... 112 more
Caused by: org.springframework.dao.InvalidDataAccessResourceUsageException: Error executing statement MATCH (ref:ReferenceNode {name:{name}}) RETURN ref; nested exception is java.lang.NullPointerException
at org.springframework.data.neo4j.support.query.CypherQueryEngine.parseAndExecuteQuery(CypherQueryEngine.java:67)
at org.springframework.data.neo4j.support.query.CypherQueryEngine.query(CypherQueryEngine.java:53)
... 128 more
Caused by: java.lang.NullPointerException
at org.neo4j.cypher.ExecutionEngine.prepare(ExecutionEngine.scala:75)
at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:60)
at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:65)
at org.neo4j.cypher.javacompat.ExecutionEngine.execute(ExecutionEngine.java:78)
at org.springframework.data.neo4j.support.query.CypherQueryEngine.parseAndExecuteQuery(CypherQueryEngine.java:65)
... 129 more

Neo4j和Pom.xml上的spring-data依赖关系

<properties>
    <spring.version>3.2.6.RELEASE</spring.version>
    <springSecurity.version>3.2.0.RELEASE</springSecurity.version>
    <jackson.version>1.9.13</jackson.version>
    <neo4j.version>2.0.0</neo4j.version>
    <springDataNeo4j.version>3.0.0.RC1</springDataNeo4j.version>
    <neo4j-rest-graphdb.version>2.0.0</neo4j-rest-graphdb.version>
</properties>
<!--Neo4j-->
    <dependency>
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j</artifactId>
        <version>${neo4j.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-neo4j</artifactId>
        <version>${springDataNeo4j.version}</version>
    </dependency>


    <dependency>
        <groupId>org.neo4j</groupId>
        <artifactId>neo4j-rest-graphdb</artifactId>
        <version>${neo4j-rest-graphdb.version}</version>
    </dependency>

上下文文件

<neo4j:config graphDatabaseService="graphDatabaseService" />

<bean id="graphDatabaseService" class="org.neo4j.rest.graphdb.RestGraphDatabase">
    <constructor-arg value="http://localhost:7474/db/data"/>
</bean>

<context:annotation-config />

Neo4j启动并运行。

通过http://localhost:7474/browser/连接时，一切正常，包括违规查询MATCH（ref：ReferenceNode {name：{name}}）RETURN ref;

Answer 1

我相信您不需要任何org.neo4j.*依赖项。也许只适用于<artifactId>spring-data-neo4j</artifactId>和<artifactId>spring-data-neo4j-rest</artifactId>。这是您应该尝试的配置：

<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-neo4j</artifactId>
    <version>3.0.0.RC1</version>
</dependency>
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-neo4j-rest</artifactId>
    <version>3.0.0.RC1</version>
</dependency>

<强>更新

可疑的是，org.springframework.data.neo4j.support.ReferenceNodes getReferenceNode（http://bit.ly/1eDYlYS）中getReferenceNode生成了错误消息。

org.springframework.data.neo4j.support.typerepresentation.SubReferenceNodeTypeRepresentationStrategy方法仅在SDN的某个地方调用:ReferenceNode（http://bit.ly/LW5gly）。

此调用正在寻找标签为name且属性root等于CREATE (n:ReferenceNode {name:"root"}) RETURN n;的节点。

所以我建议尝试使用Cypher创建这样一个节点：

{{1}}

并查看错误是否仍然存在。

使用Spring Data 3.0 Rest的Neo4j 2.0启动时的例外

1 个答案: