“No persistence unit with name 'demo2' found

自己明明就在META-INF資料夾下建立了persistence
.xml檔案 可以執行時就是得報這個錯

persistentce.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
    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">
    <persistence-unit name="demo2" transaction-type="RESOURCE_LOCAL">
        <!-- provider>org.eclipse.persistence.jpa.PersistenceProvider</provider -->
        <provider>org.hibernate.ejb.HibernatePersistence</provider
 
>
        <class>com.ninelephas.meerkat.pojo.User</class>
        <!-- MYSql 的連線 -->
        <properties>
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
            <property name="hibernate.connection.url" value="jdbc:mysql://127.0.0.1:3306/demo?createDatabaseIfNotExist=true"
 
 />
            <property name="hibernate.connection.username" value="root" />
            <property name="hibernate.connection.password" value="123456liu" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
        </properties>
    </persistence-unit>
</persistence>

application.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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.2.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
         http://www.springframework.org/schema/aop 
         http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
         http://www.springframework.org/schema/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
         http://www.springframework.org/schema/data/jpa  
         http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
    <!-- 開啟IOC註解掃描 -->
    <import resource=""/>
    <context:component-scan base-package="com.demo" />
    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="generateDdl" value="true" />
                <property name="database" value="MYSQL" />
            </bean>
        </property>
        <property name="persistenceUnitName" value="demo2" />
    </bean>
    <!-- 開啟MVC註解掃描 -->
    <mvc:annotation-driven />
    <bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="viewResolvers">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="prefix" value="/WEB-INF/view/" />
                    <property name="suffix" value=".html" />
                </bean>
            </list>
        </property>
        <!-- 用於將物件轉換為 JSON -->
        <property name="defaultViews">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.json.MappingJackson2JsonView" />
            </list>
        </property>
    </bean>
    <!-- 對靜態資原始檔的訪問，將無法mapping到Controller的path交給default servlet handler處理 -->
    <mvc:default-servlet-handler />
    <!-- 配置事務管理器 -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>
    <!-- 啟用 annotation事務 -->
    <tx:annotation-driven transaction-manager="transactionManager" />
    <!-- 配置Spring Data JPA掃描目錄 -->
    <jpa:repositories base-package="com.demo" />
</beans>