无法配置 EntityManagerFactory

Question

我是 JPA 和休眠的新手。在我的网络应用程序中，我已将我的 JDBC 代码更改为 JPA。在运行网络应用程序时，我得到了一大堆错误。但是根据我对 JPA 和 Hibernate 的了解，我认为下面的两个错误代表了我的大部分问题。

• 无法配置 EntityManagerFactory
• 16047 [31149935@qtp-23671010-1] 错误 org.hibernate.util.XMLHelper - 解析 XML 时出错：XML InputStream(2) cvc-complex-type.3.1：元素的属性“版本”的值“2.0” 'entity-mappings' 对于相应的属性使用无效。属性“版本”的固定值为“1.0”。

我在网上搜索了很多这些错误。但我找不到一种解决方案。我已包含所有必需的 JAR 并将 persistence.xml 添加到类路径中。我找不到原因。

这是我的完整控制台错误列表：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Documents%20and%20Settings/tamilvendhank/Local%20Settings/Temp/Jetty_127_0_0_    1_8080_ExpMgmtWeb.war__ExpMgmtWeb__w96xvk_3923622842201679764/webapp/WEB-INF/lib/slf4j-log4j12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Documents%20and%20Settings/tamilvendhank/Local%20Settings/Temp/Jetty_127_0_0_1_8080_ExpMgmtWeb.war__ExpMgmtWeb__w96xvk_3923622842201679764/webapp/WEB-INF/lib/slf4j-simple-1.5.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
15360 [31149935@qtp-23671010-1] INFO  org.hibernate.cfg.annotations.Version  -    Hibernate Annotations 3.4.0.CR1
15375 [31149935@qtp-23671010-1] INFO  org.hibernate.cfg.Environment  - Hibernate 3.3.0.CR1
15375 [31149935@qtp-23671010-1] INFO  org.hibernate.cfg.Environment  - hibernate.properties not found
15375 [31149935@qtp-23671010-1] INFO  org.hibernate.cfg.Environment  - Bytecode provider name : cglib
15375 [31149935@qtp-23671010-1] INFO  org.hibernate.cfg.Environment  - using JDK 1.4 java.sql.Timestamp handling
15469 [31149935@qtp-23671010-1] INFO  org.hibernate.annotations.common.Version  - Hibernate Commons Annotations 3.1.0.CR1
15469 [31149935@qtp-23671010-1] INFO  org.hibernate.ejb.Version  - Hibernate EntityManager 3.4.0.CR1
16047 [31149935@qtp-23671010-1] ERROR org.hibernate.util.XMLHelper  - Error parsing XML: XML InputStream(2) cvc-complex-type.3.1: Value '2.0' of attribute 'version' of element 'entity-mappings' is not valid with respect to the corresponding attribute use. Attribute 'version' has a fixed value of '1.0'.
2010-09-19 11:23:40.265:WARN::Error for /ExpMgmtWeb/dwr/call/plaincall/ExpenseDetailsManagement.getexpenseList.dwr
java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.directwebremoting.create.NewCreator.getInstance(NewCreator.java:66)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:344)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:279)
at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:52)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:144)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
2010-09-19 11:23:40.265:WARN::Nested in java.lang.ExceptionInInitializerError:
javax.persistence.PersistenceException: [PersistenceUnit: ExpensePersistentUnit] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:265)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:125)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
at com.pricar.JPAInteg.ExpenseDetailsManagement.<clinit>(ExpenseDetailsManagement.java:21)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.directwebremoting.create.NewCreator.getInstance(NewCreator.java:66)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:344)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:279)
at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:52)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:144)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

 <?xml version="1.0" encoding="UTF-8"?>
 <persistence>
<persistence-unit name="ExpensePersistentUnit">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>com.pricar.JPAInteg.Role</class>
    <class>com.pricar.JPAInteg.User</class>
    <class>com.pricar.JPAInteg.Userdetail</class>
    <class>com.pricar.JPAInteg.Category</class>
    <class>com.pricar.JPAInteg.Expens</class>
    <class>com.pricar.JPAInteg.Leavetable</class>
    <class>com.pricar.JPAInteg.Permissiontoken</class>
    <class>com.pricar.JPAInteg.Roletokenassociation</class>
    <class>com.pricar.JPAInteg.UserPK</class>
 <properties>
    <property name="hibernate.connection.url" value="jdbc:mysql://localhost/officemgmt"/>
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"></property>
    <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
    <property name="hibernate.connection.password" value="1234"/>
    <property name="hibernate.connection.username" value="root"/>
    <property name="hibernate.hbm2ddl.auto" value="update"/>
    <property name="hibernate.show_sql" value="true"/>
 </properties>
 </persistence-unit> 
 </persistence>

---

更新：

javax.persistence.PersistenceException: [PersistenceUnit: ExpensePersistentUnit] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:371)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:55)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
at com.pricar.JPAInteg.ExpenseDetailsManagement.<clinit>(ExpenseDetailsManagement.java:21)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)

---

更新 2：

我有一些基本问题：

1. 如果使用JPA注解，JPA+Hibernate组合涉及多少个xml文件？ 我只有persistence.xml。但一共 3(dwr.xml & web.xml)

2. 如果我使用 JPA 注释，是否需要 hibernate.cfg.xml。因为，我到现在才添加。

3. 如果使用 JPA 2.0 和 Hibernate，您能否给我基本 JAR 文件名的列表！！！因为，我有超过 15 个文件。

Answer 1

您正在使用 JPA 1.0 实现，您需要提供符合 JPA 1.0 的 orm.xml（注意版本属性等）：

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings 
  xmlns="http://java.sun.com/xml/ns/persistence/orm"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
  version="1.0">
  ...
</entity-mappings>

你的可能看起来像：

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings
  xmlns="http://java.sun.com/xml/ns/persistence/orm"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"
  version="2.0">
  ...
</entity-mappings>

哪个是正确的...如果您使用的是 JPA 2.0 提供程序。

但老实说，我不知道你为什么要提供orm.xml，使用注解时通常不需要 XML 映射文件。

参考文献

• JPA 1.0 规范
  • “10.2 XML 架构”部分
• JPA 2.0 规范
  • “12.3 XML 架构”部分

---

感谢您的回复，并对 orm.xml 感到抱歉。我的重点是显示persistence.xml 的位置。我没有使用 XML 映射。该 orm.xml 是自动生成的。我要删除那个文件吗？

我确实会尝试删除orm.xml，entity-mappings 是orm.xml 的根元素，这就是错误所在。

“如果您使用 JPA 2.0 提供程序”是什么意思？提供者的意思是，休眠？？

JPA 只是一个 API。要使用 JPA，您需要此 API 的实现，此类实现称为持久性提供程序（EcliseLink、Hibernate、OpenJPA）。在您的情况下，您使用的是 Hibernate EntityManager 3.4.0.GA，它是 JPA 1.0 实现。

我必须做什么才能更改为 JPA 2.0？通过添加 javax.persistence_2.0.0.jar 或更改使用 JPA 2.0 的休眠？

两者，您都必须使用 Hibernate EntityManager 3.5+（及其依赖项，包括 javax.persistence_2.0.0.jar）。

Answer 2

16047 [31149935@qtp-23671010-1] 错误 org.hibernate.util.XMLHelper - 错误 解析 XML：XML InputStream(2) cvc-complex-type.3.1：值“2.0” 元素的属性“版本” “实体映射”无效 相对于相应的属性 采用。属性“版本”有一个固定的 值为“1.0”。

看起来这是您的 xml 中带有某种属性版本值的错误。