没有EntityManager的持久性提供者名为xx

我已经搜索完整的SO，尽管存在类似标题的帖子，但这是一个不同的场景。没有EntityManager的持久性提供者名为xx

我在我的eclipse中有两个项目1）一个JPA项目2）一个Web项目，它使用JPA项目中的实体。 OSGi和Maven都已启用。我正在使用最新的SpringFramework（3.1.1）在Web项目中创建RESTful Web服务。

项目布局如下：

1）JPA项目

com.demo.persistence 
|-src 
    |-com.demo.persistence 
    |-User 
|-META-INF 
    |-MANIFEST.MF 
    |-persistence.xml 
|-pom.xml

2）Web项目

com.demo.web 
|-src 
    |-com.demo.web.controller 
    |-Controller.java 
    |-com.demo.web.dao 
    |-UserDAO.java 
    |-UserListDAO.java 
    |-com.demo.web.model 
    |-UserBean.java 
    |-com.demo.web.interfaces 
    |-UserDAOIntf.java 
|-WebContent 
    |-META-INF 
    |-MANIFEST.MF 
    |-WEB-INF 
    |-classes 
     |-log4j.properties 
    |-rest-context.xml 
    |-rest-context-osgi.xml 
    |-rest-servlet.xml 
    |-web.xml 
    |-pom.xml

com.demo.persistence.User .java

@Entity 
@XmlRootElement(name="user") 
@Table(name = "T_USER") 
@NamedQuery(name = "AllUsers", query = "select u from User u") 
public class User { 

@Id 
@GeneratedValue 
@Column(nullable = false) 
private long id; 

@Basic 
@Column(nullable = false) 
private String userName; 

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

public String getUserName() { 
    return userName; 
} 
}

com.demo.web.dao.UserDAO

public class UserDAO implements UserDAOInterface { 
@PersistenceContext 
private EntityManager em; 

public User getUser(Long id) { 
    try{ 
     return em.find(User.class, id); 
    } finally { 
     if(em != null) 
     em.close(); 
    } 
} 

public List<User> getAllUsers() { 
    try { 
    List<User> users = em.createNamedQuery("AllUsers", User.class).getResultList(); 
    return users; 
    } finally { 
      if(em != null) 
      em.close(); 
    } 
} 

@Transactional 
public User addUser(User user) { 
    try { 
    em.persist(user); 
     em.flush(); 
    return user; 
     } finally { 
     if(em != null) 
    em.close(); 
     } 
    } 
}

com.demo.web.model

public class UserBean { 
    private UserDAO userDAO; 
    public void addUserDetails(String userName) { 
    User user = new User(); 
    user.setUserName(userName); 
    this.userDAO.addUser(user); 
} 

public List<User> getAllUsers() { 
    return this.userDAO.getAllUsers(); 
} 

public User getUser(Long id) { 
    return this.userDAO.getUser(id); 
} 

public User addUser(User user) {  
    return this.userDAO.addUser(user); 
} 
}

com.demo.web .controller.Controller

@Controller 
public class Controller { 

    private Jaxb2Marshaller jaxb2Marshaller; 
    private UserBean userBean; 

    public Jaxb2Marshaller getJaxb2Mashaller() { 
     return jaxb2Marshaller; 
    } 

    public void setJaxb2Mashaller(Jaxb2Marshaller jaxb2Marshaller) { 
     this.jaxb2Marshaller = jaxb2Marshaller; 
    } 
    @RequestMapping(method=RequestMethod.GET, value="/rest/users", headers="Accept=application/xml, application/json") 
    public @ResponseBody UserListDAO getUserList() { 
     return new UserListDAO(userBean.getAllUsers()); 
    } 

    @RequestMapping(method=RequestMethod.GET, value="rest/user/{id}", headers="Accept=application/xml, application/json") 
    public @ResponseBody User getUser(@PathVariable Long id) { 
     return userBean.getUser(id); 
    } 

    @RequestMapping(method=RequestMethod.POST, value="rest/user/add", headers="Accept=application/xml, application/json") 
    public @ResponseBody User addUser(@RequestBody String userString) { 
     Source source = new StreamSource(new StringReader(userString)); 
     User user = (User) jaxb2Marshaller.unmarshal(source); 
     return userBean.addUser(user); 
    }

的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
    <web-app 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns="http://java.sun.com/xml/ns/javaee" 
     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
     xsi:schemaLocation= 
      "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
     id="WebApp_ID" version="2.5"> 

    <display-name>com.demo.web</display-name> 

    <welcome-file-list> 
     <welcome-file>index.html</welcome-file> 
    </welcome-file-list> 

<context-param> 
    <param-name>log4jConfigLocation</param-name> 
    <param-value> 
     /WEB-INF/classes/log4j.properties 
    </param-value> 
    </context-param> 

    <listener> 
    <listener-class> 
     org.springframework.web.util.Log4jConfigListener 
    </listener-class> 
    </listener> 

    <!-- The context params that read by ContextLoaderListener --> 
    <context-param> 
     <param-name>contextConfigLocation</param-name> 
     <param-value> 
      /WEB-INF/rest-context.xml 
     </param-value> 
    </context-param> 

    <!-- This listener will load other application context file in addition to springweb-servlet.xml --> 
    <listener> 
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 

    <servlet> 
     <servlet-name>rest</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 

    <servlet-mapping> 
     <servlet-name>rest</servlet-name> 
     <url-pattern>/service/*</url-pattern> 
    </servlet-mapping> 
</web-app>

其余-context.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:tx="http://www.springframework.org/schema/tx" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation=" 
     http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
     http://www.springframework.org/schema/context 
     http://www.springframework.org/schema/context/spring-context-3.0.xsd 
     http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"> 

    <context:annotation-config /> 
    <context:component-scan base-package="com.demo.web.controller" /> 
    <tx:annotation-driven transaction-manager="transactionManager" /> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
     <property name="persistenceUnitName" value="com.demo.persistence" /> 
    </bean> 

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

    <!-- Bean - DAO Mapping --> 
    <bean id="userDAO" class="com.demo.dao.UserDAO"> 
     <property name="entityManagerFactory" ref="entityManagerFactory" /> 
    </bean> 

    <!-- Bean Declarations --> 
    <bean id="userBean" class="com.demo.web.model.UserBean"> 
     <property name="userDAO" ref="userDAO" /> 
    </bean> 

</beans>

其余-上下文osgi.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:osgi="http://www.springframework.org/schema/osgi" 
    xsi:schemaLocation=" 
     http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
     http://www.springframework.org/schema/osgi 
     http://www.springframework.org/schema/osgi/spring-osgi-1.0.xsd"> 

    <osgi:service interface="javax.persistence.EntityManager" ref="entityManagerFactory" /> 

</beans>

休息-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:mvc="http://www.springframework.org/schema/mvc" 
    xsi:schemaLocation=" 
     http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
     http://www.springframework.org/schema/mvc 
     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> 

    <!-- To enable @RequestMapping process on type level and method level --> 
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> 
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> 
     <property name="messageConverters"> 
      <list> 
       <ref bean="marshallingConverter" /> 
       <ref bean="jsonConverter" /> 
      </list> 
     </property> 
    </bean> 

    <bean id="marshallingConverter" class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"> 
     <constructor-arg ref="jaxbMarshaller" /> 
     <property name="supportedMediaTypes" value="application/xml"/> 
    </bean> 

    <bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 
     <property name="supportedMediaTypes" value="application/json" /> 
    </bean> 

    <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"> 
     <property name="classesToBeBound"> 
      <list> 
       <value>com.demo.persistence.User</value> 
       <value>com.demo.dao.UserListDAO</value> 
      </list> 
     </property> 
    </bean> 

    <bean id="users" class="org.springframework.web.servlet.view.xml.MarshallingView"> 
     <constructor-arg ref="jaxbMarshaller" /> 
    </bean> 

    <!--bean id="viewResolver" class="org.springframework.web.servlet.view.BeanNameViewResolver" /--> 

    <bean id="userController" class="com.demo.web.controller.Controller"> 
     <property name="userDAO" ref="userDAO" /> 
     <property name="jaxb2Mashaller" ref="jaxbMarshaller" /> 
    </bean> 
</beans>

控制台 - log4j的

ERROR [org.springframework.web.context.ContextLoader] - Context initialization failed 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/rest-context.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: No Persistence provider for EntityManager named com.demo.persistence 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455) 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) 

    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294) 

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225) 

    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291) 

    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567) 

    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) 

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464) 

    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385) 

    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284) 

    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111) 

    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4779) 

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5273) 

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 

    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:897) 

    at org.apache.catalina.core.ContainerBase.access$000(ContainerBase.java:131) 

    at org.apache.catalina.core.ContainerBase$PrivilegedAddChild.run(ContainerBase.java:154) 

    at org.apache.catalina.core.ContainerBase$PrivilegedAddChild.run(ContainerBase.java:143) 

    at java.security.AccessController.doPrivileged(Native Method) 

    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871) 

    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615) 

    at org.eclipse.gemini.web.tomcat.internal.TomcatServletContainer.startWebApplication(TomcatServletContainer.java:122) 

    at org.eclipse.gemini.web.internal.StandardWebApplication.start(StandardWebApplication.java:91) 

    at org.eclipse.gemini.web.extender.WebContainerBundleCustomizer.addingBundle(WebContainerBundleCustomizer.java:45) 

    at org.osgi.util.tracker.BundleTracker$Tracked.customizerAdding(BundleTracker.java:482) 

    at org.osgi.util.tracker.BundleTracker$Tracked.customizerAdding(BundleTracker.java:1) 

    at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:262) 

    at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:234) 

    at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:457) 

    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:847) 

    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230) 

    at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148) 

    at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEventPrivileged(Framework.java:1522) 

    at org.eclipse.osgi.framework.internal.core.Framework$7.run(Framework.java:1462) 

    at java.security.AccessController.doPrivileged(Native Method) 

    at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1460) 

    at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1453) 

    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:391) 

    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299) 

    at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.resumeBundles(PackageAdminImpl.java:311) 

    at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.processDelta(PackageAdminImpl.java:555) 

    at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.doResolveBundles(PackageAdminImpl.java:251) 

    at org.eclipse.osgi.framework.internal.core.PackageAdminImpl$1.run(PackageAdminImpl.java:173) 

    at java.lang.Thread.run(Thread.java:722) 

Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named com.demo.persistence 

    at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source) 

    at org.springframework.orm.jpa.LocalEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalEntityManagerFactoryBean.java:92) 

    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310) 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$6.run(AbstractAutowireCapableBeanFactory.java:1504) 

    at java.security.AccessController.doPrivileged(Native Method) 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1502) 

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452) 

    ... 45 more

对不起，巨大的柱状。但是我将持久性包导出到Manifest文件中，并将其导入到我的Web应用程序中。

并且使用的持久性提供者是org.eclipse.persistence.jpa.PersistenceProvider。这一直停止我的项目从一个月.. :(请帮助。

在此先感谢。

编辑

的persistence.xml

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.0" 
    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_2_0.xsd"> 
    <persistence-unit name="com.demo.persistence" 
     transaction-type="RESOURCE_LOCAL"> 
     <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> 
     <class>com.demo.persistence.Person</class> 
     <properties> 
      <property name="eclipselink.weaving" value="false" /> 
      <property name="eclipselink.ddl-generation" value="create-tables" /> 
     </properties> 
    </persistence-unit> 
</persistence>

来源

2012-04-20 hax0rag3

你可以发布你的persistence.xml吗？ – fmgp 2012-04-20 18:58:49

我已经添加了我的persistence.xml。 – hax0rag3 2012-04-21 01:50:18

这不是一个好问题。请参阅http://sscce.org以获取改进方法（以及您可能会在此问到的未来问题）。 – 2012-04-24 06:20:42

您指示您的容器管理和初始化你的持久化上下文为您提供：

@PersistenceContext 
private EntityManager em;

但它只能如果它有权访问persistence.xml fil，请执行此操作e在与执行实体管理器初始化的位置相同的存档中。在这种情况下，您应该将所有持久性逻辑移入您的持久性项目中（这就是您创建它的原因）。或者，您可以将您的persistence.xml复制到Web项目中（不推荐）。

来源

2012-04-20 19:01:15 Perception

我可以不把它分成不同的项目吗？ DAO类和持久化单元分成不同的项目。实际上，即使是dao类也需要从web项目中获取spli，即持久性，dao类，我使用我的控制器访问不同项目的web项目。或者有什么方法可以在编译/运行时将持久性项目存档添加到我的web项目中？ – hax0rag3 2012-04-21 01:53:34

你需要这种分离的理由是什么？在一天结束时，您的persistence.xml文件将需要位于与初始化实体管理器相同的归档中。我强烈建议把所有的持久化类放在一个项目中（配置文件，实体和DAO）。 – Perception 2012-04-21 13:19:17

这种分离程度的原因是这个项目可能会变得相当大，并且将难以维护，因此也是需要的。如果什么都不起作用，最后一个选项就是你的建议@Perception。但我真的需要它以我已经解释的格式。另外，我在非Maven和非OSGi类型的环境中尝试了相同的方法，JPA项目放置在Web项目的部署程序集中，并且工作正常。 JPA项目作为JAR文件导出到Web项目的WAR文件中。 – hax0rag3 2012-04-22 03:58:35

没有EntityManager的持久性提供者名为xx

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