jpa 集成Spring出错了，不知道哪个地方出错了，请大侠们明示或暗示... 400 请求报错 

beans.xml

<?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:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

<context:component-scan base-package="cn.cake" />
<context:property-placeholder location="classpath:jdbc.properties"/>
	
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
	<property name="driverClassName" value="${jdbc.driverClassName}"/>
	<property name="url" value="${jdbc.url}"/>
	<property name="username" value="${jdbc.username}"/>
	<property name="password" value="${jdbc.password}"/>
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" >
	<property name="dataSource" ref="dataSource"/>
	<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>
	
</bean>

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
	<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>

<tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

<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_1_0.xsd"
		version="1.0">

	<persistence-unit name="wgzh" transaction-type="RESOURCE_LOCAL">
	<provider>org.hibernate.ejb.HibernatePersistence</provider>
	<properties>
		<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
		<property name="hibernate.hbm2ddl.auto" value="update"/>
		<!-- 
		<property name="hibernate.connection.url" value="jdbc:mysql://127.0.0.1:3306/cake?characterEncoding=utf8"/>
		<property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/>
		<property name="hibernate.connection.username" value="root"/>
		<property name="hibernate.connection.password" value="123456"/>
		 -->
	</properties>
	</persistence-unit>

</persistence>