我继承了一个使用Netbeans 7.4创建的基于maven的项目。我在服务器选项卡中配置了本地Glassfish 3.1.2.2，设置了JDBC连接池和资源，并且可以正确调试项目。 但是，我在其中一个连接的数据库中创建了另外两个表，让Netbeans从Database模式生成2个新实体。实体生成正确，但是当我开始使用它们并在glassfish服务器上启动调试会话时，我可以看到记录的错误消息，说明实体未在持久性单元中声明。
我正在尝试找到正在使用的persistence.xml，但是虽然我在项目结构中找到了很多旧的（我没有创建自己，我没有与作者联系）我不能找到任何似乎正在使用的人。 Hibernate仅引用持久性单元名称，而不是指正在使用的文件的路径。
我是Java Persistence的新手，所以我有点困惑。任何人都可以建议我如何找到或重新创建persistence.xml文件吗？
编辑：这是堆栈跟踪：
INFO: HHH000412: Hibernate Core {4.2.6.Final}
INFO: HHH000206: hibernate.properties not found
INFO: HHH000021: Bytecode provider name : javassist
INFO: HHH000204: Processing PersistenceUnitInfo [
name: core_rw_pu_hibernate
...]
INFO: HHH000130: Instantiating explicit connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method
SEVERE: Exception while preparing the app
SEVERE: [PersistenceUnit: core_rw_pu_hibernate] Unable to build EntityManagerFactory
javax.persistence.PersistenceException: [PersistenceUnit: core_rw_pu_hibernate] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:76)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.loadPU(PersistenceUnitLoader.java:206)
at org.glassfish.persistence.jpa.PersistenceUnitLoader.<init>(PersistenceUnitLoader.java:120)
at org.glassfish.persistence.jpa.JPADeployer$1.visitPUD(JPADeployer.java:224)
at org.glassfish.persistence.jpa.JPADeployer$PersistenceUnitDescriptorIterator.iteratePUDs(JPADeployer.java:495)
at org.glassfish.persistence.jpa.JPADeployer.createEMFs(JPADeployer.java:233)
at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:168)
at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:871)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:410)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:389)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:348)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:363)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1085)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:95)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1291)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1259)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:461)
at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:212)
at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:179)
at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117)
at com.sun.enterprise.v3.services.impl.ContainerMapper$Hk2DispatcherCallable.call(ContainerMapper.java:354)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.acme.ee.domain.entity.DeviceEntity.deviceInOuts[com.acme.ee.domain.entity.DeviceInOuts]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1059)
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:733)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:668)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:69)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1632)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1390)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1777)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
... 38 more
答案 0 :(得分：1)
在普通的基于maven的Web应用程序项目中，persistence.xml必须放在文件夹中：
src/main/resources/META-INF
在NetBeans项目选项卡中，可以通过打开＆＃34;其他来源＆＃34; （应该在＆＃34; Source Packages＆＃34;下面）。
如果这不是正确的文件，您可以选择在整个项目中搜索PersistenceUnit的名称。该名称必须在persistence.xml中声明。如果找到多个文件，您可以通过逐个使文件不可解析来找到实际使用的文件。要执行此操作，只需删除第一个文件中的结束标记（如</provider>），保存并部署即可。如果它抛出一个错误，告诉你文件是不可解析的（可能是包含类SAXParser的东西），这就是使用的文件。如果它没有抛出错误，请再次使用下一个文件。
要修复初始问题（不在持久性单元中的新实体），请确保在persistence.xml中添加新的实体类，如下所示：
<class>com.company.SomeClass</class>
另一种选择是将以下内容添加到persistence.xml：
<exclude-unlisted-classes>false</exclude-unlisted-classes>
这应该会自动发现所有实体，但有时这不起作用，因为项目结构不合适，那么你必须明确列出每个实体。
答案 1 :(得分：0)
您的persistence.xml应该包含有关您与数据库的连接的信息，如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="YOUR_PERSISTENCE_UNIT_NAME" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/YOUR_JNDI_NAME</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<!--<property name="javax.persistence.schema-generation.database.action" value="none"/> -->
<property name="hibernate.archive.autodetection" value="class"/>
<property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
<property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/YOUR_SCHEMA_NAME?zeroDateTimeBehavior=convertToNull"/>
<property name="hibernate.connection.username" value="YOUR_USERNAME"/>
<property name="hibernate.connection.password" value="YOUR_PASSWORD"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
</persistence>