无法修复java.lang.IllegalStateException:无法检索unitName的EntityManagerFactory

时间:2014-07-22 16:28:58

标签: java eclipse jsp java-ee servlets

我正在尝试通过制作项目来学习JSP和servlet。我的目标不是专注于JPA,ORM和持久性 或者甚至是EJB。所以,请不要告诉我阅读教程或书籍。不幸的是,我不应该 使用SQL查询与数据库交互。相反,我使用预先编写的JPA代码来管理持久性 而我专注于jsp和servlets。

当我运行我的项目时,我收到错误 - java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName AffableBeanPU. 我的项目位于 - https://github.com/double-whammy/affablebean.git 下载拉链按钮位于右下角。

注意 - 我的persistence.xml文件位于META-INF文件夹中。我再次检查并构建了我的项目。 所以可以排除这个原因。

我用谷歌搜索,没有任何解决方案有帮助。我该如何解决这个错误?

MyProject
|
|__java (src folder)
|    |
|    |__controller (package)
|    |   |__ControllerServlet.java
|    |
|    |__entity (entity classes here) 
|    |__session (facade classes for each entity class)
|
|   
|__WebContent
    |
    |__WEB-INF
         |
         |__view
         |    |__category.jsp        
         |    |
         |    |etc...
         |
         |__index.jsp

例外:

Time|Info: Redirecting to /index.jsf
Time|Info: Admin Console: Initializing Session Attributes...
Time|Warning: EJB5184:A system exception occurred during an invocation on EJB CategoryFacade, 
method: public java.util.List session.AbstractFacade.findAll()
Time|Warning: javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:698)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:503)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4475)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2009)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1979)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:220)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at com.sun.proxy.$Proxy193.findAll(Unknown Source)
at session.__EJB31_Generated__CategoryFacade__Intf____Bean__.findAll(Unknown Source)
at controller.ControllerServlet.init(ControllerServlet.java:31)
at javax.servlet.GenericServlet.init(GenericServlet.java:244)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1583)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1212)
etc ................................................... etc...
at java.lang.Thread.run(Thread.java:745) 

Caused by: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName AffableBeanPU
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:138)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:171)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.getCriteriaBuilder(EntityManagerWrapper.java:834)
at session.AbstractFacade.findAll(AbstractFacade.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
etc ................................................... etc...
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
... 33 more

Time|Severe: WebModule[/AffableBean]StandardWrapper.Throwable
javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:698)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:503)
etc ................................................... etc...
at session.__EJB31_Generated__CategoryFacade__Intf____Bean__.findAll(Unknown Source)
at controller.ControllerServlet.init(ControllerServlet.java:31)
at javax.servlet.GenericServlet.init(GenericServlet.java:244)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1583)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1212)
etc ................................................... etc...
at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName AffableBeanPU
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:138)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:171)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.getCriteriaBuilder(EntityManagerWrapper.java:834)
at session.AbstractFacade.findAll(AbstractFacade.java:41)
etc ................................................... etc...
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
... 33 more

Time|Warning: StandardWrapperValve[ControllerServlet]: Allocate exception for servlet ControllerServlet
java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName AffableBeanPU
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:138)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:171)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.getCriteriaBuilder(EntityManagerWrapper.java:834)
at session.AbstractFacade.findAll(AbstractFacade.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
etc ................................................... etc...

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="AffableBeanPU"
    transaction-type="JTA">
    <jta-data-source>jdbc/affablebean</jta-data-source>
    <properties>
        <property name="eclipselink.logging.level" value="FINEST" />
    </properties>
</persistence-unit>
</persistence>

4 个答案:

答案 0 :(得分:15)

/META-INF/persistence.xml必须以运行时类路径结束,而不是在Web资源中。因此,您需要将其放在Java源文件夹中,而不是放在Web内容文件夹中。 persistence.xml与Web资源无关,而与Java bean无关。

向上移动:

MyProject
 |-- java (src folder)
 |    |-- controller
 |    |    `--ControllerServlet.java
 |    |-- entity
 |    |-- session
 |    `-- META-INF
 |         `-- persistence.xml <-- Here.
 `--WebContent
     `-- WEB-INF
          |-- view
          |    |-- category.jsp        
          |    `-- etc..
          `-- index.jsp

这样构建将在/META-INF/persistence.xml内生成/WEB-INF/classes的正确WAR结构。您似乎正在使用Eclipse,您也可以通过在项目属性中选择JPA facet来实现此目的。

enter image description here

这样Eclipse就会在正确的位置生成persistence.xml

enter image description here

答案 1 :(得分:4)

您提到persistence.xml中存在META-INF。如果您要将此应用程序部署为WAR文件,则需要将persistence.xml打包为

WEB-INF
 `- classes
     `- META-INF
         `- persistence.xml`

根据JPA 2.0 specification 8.2持久单元包装部分:

  

持久性单元由persistence.xml文件定义。 jar文件   或其META-INF目录包含persistence.xml的目录   file被称为持久性单元的根。在Java EE中   在环境中,持久性单元的根必须是其中之一   以下:

     

•EJB-JAR文件
  •WAR文件的WEB-INF / classes目录
  •WAR文件的WEB-INF / lib目录中的jar文件
  •EAR库目录中的jar文件
  •应用程序客户端jar文件

     

不需要包含的EJB-JAR或WAR文件   除非持久性单元,否则持久性单元必须打包在EAR中   包含持久性类以及包含在其中的持久性类   EJB-JAR或WAR。

答案 2 :(得分:2)

因为您的项目结构不正确。为ejb和Web应用程序创建两个单独的部分,然后将它们打包到EAR或使用CDI。 JPA(EntityManagerFactory是其中的一部分)根本没有被应用程序的容器激活。

对于企业应用程序:

http://www.youtube.com/watch?v=32wpTh1TmY4

对于CDI:

http://www.hascode.com/2011/02/creating-a-sample-java-ee-6-blog-application-with-jpa-ejb-cdi-jsf-and-primefaces-on-glassfish/

答案 3 :(得分:1)

我遇到了与Embedded Glassfish服务器类似的问题,原因是:

java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName cis_ejbPU
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:132)

要解决以下问题

1)在pom.xml中添加以下依赖项

      <dependency>
                <groupId>org.glassfish.extras</groupId>
                <artifactId>glassfish-embedded-all</artifactId>
                <version>3.2-b06</version>
                <scope>provided</scope>
            </dependency>

       <dependency>
           <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
                </dependency>

2)设置嵌入式容器的HashMap属性

    File target = prepareModuleDirectory();
             Map<String, Object> properties = new HashMap<String, Object>();
             properties.put(EJBContainer.MODULES, target);

             properties.put("org.glassfish.ejb.embedded.glassfish.installation.root", "./src/test/glassfish/");
             properties.put("org.glassfish.ejb.embedded.glassfish.configuration.file", "./src/test/glassfish/domains/domain1/config/domain.xml");
    container = javax.ejb.embeddable.EJBContainer.createEJBContainer(properties);

3)

        private static final String MODULE_NAME = "embedded";
        private static final String TARGET_DIR = "target/" + MODULE_NAME;


    private static File prepareModuleDirectory() throws IOException {
        File result = new File(TARGET_DIR);
        FileUtils.copyDirectory(new File("target/classes"), result);
        FileUtils.copyFile(new File("target/test-classes/META-INF/persistence.xml"),
                new File(TARGET_DIR + "/META-INF/persistence.xml"));
        return result;
    }

4)在

下创建文件夹结构
src\test\glassfish\domains\domain1\config 

并复制

下的glassfish domain.xml
<glassfish server install> glassfish\domains\domain1\config  to src\test\glassfish\domains\domain1\config.

我按照上述步骤解决了问题。