jboss 7.0.1 hibernate javax.persistence.PersistenceException：没有 EntityManager 的持久性提供程序

Question

我的休眠应用程序在 jboss-as-7.0.0.Final 中成功运行，我将其移至 jboss-as-7.0.1.Final 并且我开始收到这些错误，

17:42:42,725 ERROR [com.mycompany.myapp.common.persistence.HibernateUtil] (MSC service thread 1-12) Initial SessionFactory lookup failed.: javax.persistence.PersistenceException: No Persistence provider for EntityManager named primary2
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:69) [hibernate-jpa-2.0-api-1.0.1.Final.jar:1.0.1.Final]
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47) [hibernate-jpa-2.0-api-1.0.1.Final.jar:1.0.1.Final]
at com.mycompany.myapp.common.persistence.HibernateUtil.<clinit>(HibernateUtil.java:35) [classes:]
at com.mycompany.myapp.common.businessobjects.ServerSettings.GetServerSettings(ServerSettings.java:84) [classes:]
at com.mycompany.myapp.common.jms.JMSListenerServletTemplate.init(JMSListenerServletTemplate.java:41) [classes:]
at com.mycompany.myapp.common.jms.JMSAnywhereServlet.init(JMSAnywhereServlet.java:179) [classes:]
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1102) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3631) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3844) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70) [jboss-as-web-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)
at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26]
at java.lang.Thread.run(Thread.java:680) [:1.6.0_26]

17:42:42,732 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/myapp]] (MSC service thread 1-12) StandardWrapper.Throwable: java.lang.NoClassDefFoundError: Could not initialize class com.mycompany.myapp.common.persistence.HibernateUtil
at com.mycompany.myapp.common.businessobjects.ServerSettings.GetServerSettings(ServerSettings.java:92) [classes:]
at com.mycompany.myapp.common.jms.JMSListenerServletTemplate.init(JMSListenerServletTemplate.java:41) [classes:]
at com.mycompany.myapp.common.jms.JMSAnywhereServlet.init(JMSAnywhereServlet.java:179) [classes:]
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1102) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3631) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3844) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70) [jboss-as-web-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)
at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26]
at java.lang.Thread.run(Thread.java:680) [:1.6.0_26]

17:42:42,734 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/myapp]] (MSC service thread 1-12) Servlet /myapp threw load() exception: java.lang.NoClassDefFoundError: Could not initialize class com.mycompany.myapp.common.persistence.HibernateUtil
at com.mycompany.myapp.common.businessobjects.ServerSettings.GetServerSettings(ServerSettings.java:92) [classes:]
at com.mycompany.myapp.common.jms.JMSListenerServletTemplate.init(JMSListenerServletTemplate.java:41) [classes:]
at com.mycompany.myapp.common.jms.JMSAnywhereServlet.init(JMSAnywhereServlet.java:179) [classes:]
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1202) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1102) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3631) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3844) [jbossweb-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:70) [jboss-as-web-7.0.1.Final.jar:7.0.1.Final]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)
at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_26]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_26]
at java.lang.Thread.run(Thread.java:680) [:1.6.0_26]

我的 persistence.xml 看起来像

<?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="primary">
  <non-jta-data-source>java:jboss/datasources/MySqlDS</non-jta-data-source>

  <properties>

     <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
     <property name="hibernate.ejb.interceptor.session_scoped" value="com.clairvista.liveexpert.common.persistence.BusinessObjectInterceptor"/>
           </properties>

我的 pom.xml 看起来像

  <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.0.0.Beta5</version>
  </dependency>

  <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-commons-annotations</artifactId>
    <version>3.2.0.Final</version>
  </dependency>
  <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.0.0.Beta5</version>
  </dependency>

  <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-infinispan</artifactId>
    <version>4.0.0.Beta5</version>
  </dependency>

抛出这些错误的代码，看起来

        entityManagerFactory = Persistence.createEntityManagerFactory("primary");

我不确定发生了什么 - 这个应用程序正在 jboss-as-7.0.0.Final 中工作。我知道 7.0.1 对应用程序中捆绑的 hibernate 版本有更好的支持 - 但我不确定这与我的问题有何关系，因为我想使用与容器捆绑的 hibernate 版本。有什么想法吗？

Answer 1

我们的 pom.xml 中没有任何 hibernate- 依赖项，因为 JBoss 已经有了它们。您只需要设置为提供的 JBoss 7 库。

<dependency>
    <groupId>org.jboss.spec</groupId>
    <artifactId>jboss-javaee-6.0</artifactId>
    <version>2.0.0.Final</version>
    <type>pom</type>
    <scope>provided</scope>
</dependency>

NoClassDefFoundError 通常与类或接口在类路径中出现两次有关，因此类加载器不知道该使用哪一个。

Answer 2

错误显示“没有名为 Primary2 的 EntityManager 的持久性提供程序”

，但您的 persistence.xml 将单元命名为“primary”（没有后缀 2）：

<persistence-unit name="primary">

这可能是问题所在吗？

Answer 3

您应该将 hibernate 依赖项的所有 设置为 provided，因为它包含在 JBoss 7 中。

例如，对于第一个依赖项，您应该编写：

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.0.0.Beta5</version>
    <scope>provided</scope>
</dependency>