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我写了一个使用 NEO4j 作为数据后端的 spring mvc 网络服务器。现在我想用 cassandra 扩展它，所以服务器应该能够使用这两个数据库。

我遵循了这两个关于如何结合昆德拉（基于 JPA 的 Cassandra API）的教程： https ://github.com/impetus-opensource/Kundera/wiki/Using-Kundera-with-Spring https://code.google。 com/p/kundera/wiki/HowToUseKunderaWithSpring

但是我无法将 entitymanagerfactory bean 添加到我的 applicationcontext.xml 文件中。

     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
       <property name="persistenceUnitName" value="cassandra_pu"/>
    </bean>

当我这样做时，spring 给出了一个错误，它无法创建我的网络服务器使用的任何现有控制器。

Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'indexController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private bmsapp.service.DataBasePopulator bmsapp.controller.IndexController.dbPopulator; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean] for bean with name 'entityManagerFactory' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4797)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5291)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
    Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private bmsapp.service.DataBasePopulator bmsapp.controller.IndexController.dbPopulator; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean] for bean with name 'entityManagerFactory' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 22 more

这些控制器是通过在其类文件中使用 @Controller 注释并通过在使用它们的文件中自动装配它们来创建的。这正常工作但是当我添加 entityManagerFactory bean时它突然停止工作。这怎么可能？

我的 applicationContext 文件目前如下所示：

<?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:neo4j="http://www.springframework.org/schema/data/neo4j"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/data/neo4j 
http://www.springframework.org/schema/data/neo4j/spring-neo4j-2.0.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
">

<!-- Scans the classpath for annotated components that will be auto-registered 
    as Spring beans. For example @Controller and @Service. -->
<context:component-scan base-package="bmsapp" />

<!-- Activate Spring Data Neo4j repository support -->
<neo4j:config storeDirectory="data/graph.db" base-package="bmsapp.domain" />
<neo4j:repositories base-package="bmsapp.repository" />

<bean
    class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

<bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

<bean id="messageSource"
    class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="messages" />
</bean>

 <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="cassandra_pu"/>
</bean>

<tx:annotation-driven mode="proxy" />
<!-- context:annotation-config / -->
<!-- use this for Spring Jackson JSON support -->
<mvc:annotation-driven />

还有我的 persistence.xml 文件：

<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="cassandra_pu">
    <provider>com.impetus.kundera.KunderaPersistence</provider>     
    <properties>            
        <property name="kundera.nodes" value="localhost"/>
        <property name="kundera.port" value="9160"/>
        <property name="kundera.keyspace" value="KunderaExamples"/>
        <property name="kundera.dialect" value="cassandra"/>
        <property name="kundera.client.lookup.class" value="com.impetus.client.cassandra.pelops.PelopsClientFactory" />
        <property name="kundera.cache.provider.class" value="com.impetus.kundera.cache.ehcache.EhCacheProvider"/>
        <property name="kundera.cache.config.resource" value="/ehcache-test.xml"/>                  
    </properties>       
</persistence-unit>

SimpleComment 域类：

package bmsapp.domain;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.Table;
 import javax.xml.bind.annotation.XmlRootElement;
 @Entity
 @Table(name = "SIMPLE_COMMENT", schema = "KunderaExamples@cassandra_pu")
 @XmlRootElement(name = "SimpleComment")
 public class SimpleComment {
@Id
@Column(name = "COMMENT_ID")
private int id;

@Column(name = "USER_NAME")
private String userName;

@Column(name = "COMMENT_TEXT")
private String commentText;

public SimpleComment() {
}

public SimpleComment(int commentId, String userName, String commentText) {
    this.id = commentId;
    this.userName = userName;
    this.commentText = commentText;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getUserName() {
    return userName;
}

public void setUserName(String userName) {
    this.userName = userName;
}

public String getCommentText() {
    return commentText;
}

public void setCommentText(String commentText) {
    this.commentText = commentText;
}
}

SpringExampleDao：

package bmsapp.repository;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import bmsapp.domain.SimpleComment;

@Service
public class SpringExampleDao
{
    @PersistenceContext(type=PersistenceContextType.EXTENDED)
    private  EntityManager entityManager;

    public SimpleComment addComment(int id, String userName, String commentText)
    {
        SimpleComment simpleComment = new SimpleComment(id, userName, commentText);        
        entityManager.persist(simpleComment);
        return simpleComment;
    }

    public SimpleComment getCommentById(String Id)
    {

        SimpleComment simpleComment = entityManager.find(SimpleComment.class, Id);
        return simpleComment;
    }

    public List<SimpleComment> getAllComments()
    {
        Query query = entityManager.createQuery("SELECT c from SimpleComment c");
        List<SimpleComment> list = query.getResultList();
        return list;
    }
}
4

1 回答 1

2

堆栈跟踪的相关部分是：

nested exception is java.lang.ClassNotFoundException: org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean

所以你需要添加一个依赖spring-orm，见http://mvnrepository.com/artifact/org.springframework/spring-orm。

但是，我不确定这是否真的能解决您的问题。在您提到 Neo4j 的描述中，我看不出您描述的哪一部分与此相关。

于 2014-04-26T11:42:56.480 回答