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我使用springmvc来构建我的项目。但我有一个问题：我的持久性有什么问题？
的persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
<property name="hibernate.connection.url"
value="jdbc:mysql://localhost:3306/springdemo"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.connection.username" value="root"/>
<property name="hibernate.connection.password" value="hukangze"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.connection.useUnicode" value="true"/>
<property name="hibernate.connection.characterEncoding" value="UTF-8"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.use_sql_comments" value="false"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.connection.autoReconnect" value="true"/>
<property name="connection.autoReconnectForPools" value="true"/>
<property name="connection.is-connection-validation-required" value="true"/>
</properties>
</persistence-unit>
</persistence>
MVC-调度-servlet.xml中：
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:tx="http://www.springframework.org/schema/tx"
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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan base-package="com.ssh.controller"/>
<mvc:default-servlet-handler/>
<mvc:annotation-driven/>
<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<jpa:repositories base-package="com.ssh.repository"/>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="defaultPersistenceUnit"/>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" value="entityManagerFactory"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
当我运行它，我得到这个错误：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory': no matching editors or conversion strategy found
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory': no matching editors or conversion strategy found
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory': no matching editors or conversion strategy found
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'javax.persistence.EntityManagerFactory' for property 'entityManagerFactory': no matching editors or conversion strategy found
但是当我撤销mvc-dispatcher-servlet.xml中的这段代码时：
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" value="entityManagerFactory"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
没关系。怎么了？那段代码是做什么的？