我正在使用hibernate和mysql，但是当我创建了webapplication并将其部署在glassfish上时，我遇到了这个错误
[2014-02-19T18:30:54.170+0100] [glassfish 4.0] [WARNING] [] [javax.enterprise.web] [tid: _ThreadID=19 _ThreadName=http-listener-1(1)] [timeMillis: 1392831054170] [levelValue: 900] [[
StandardWrapperValve[FacesServlet]: Servlet.service() for servlet FacesServlet threw exception
org.hibernate.MappingException: Unknown entity: com.example.Person
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:693)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1485)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:120)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
at com.example.personManager.addPerson(personManager.java:30)
at com.example.PersonFormBean.addPerson(PersonFormBean.java:38)
at com.example.PersonFormBean$Proxy$_$$_WeldClientProxy.addPerson(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.el.parser.AstValue.invoke(AstValue.java:275)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:744)
]]
我的Person类看起来像这样：
package com.example;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Person implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
private int id;
private String name;
private int yob;
public Person() {
}
public Person(String name, int yob) {
super();
this.name = name;
this.yob = yob;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getYob() {
return yob;
}
public void setYob(int yob) {
this.yob = yob;
}
}
人事经理：
package com.example;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
public class personManager {
SessionFactory sessionFactory;
Session session;
Configuration configuration;
public personManager() {
try {
configuration = new AnnotationConfiguration();
configuration.addAnnotatedClass(Person.class).configure().buildSessionFactory();
sessionFactory = configuration.addAnnotatedClass(Person.class).configure().buildSessionFactory();
session = sessionFactory.openSession();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public void addPerson(Person p) {
session.beginTransaction();
session.save(p);
try {
session.getTransaction().commit();
} catch (Throwable ex) {
System.err.println("Saving failed." + ex);
session.getTransaction().rollback();
throw new ExceptionInInitializerError(ex);
}
}
public void deletePerson(Person p) {
session.beginTransaction();
session.delete(p);
try {
session.getTransaction().commit();
} catch (Throwable ex) {
System.err.println("Saving failed." + ex);
session.getTransaction().rollback();
throw new ExceptionInInitializerError(ex);
}
}
@SuppressWarnings("unchecked")
public List<Person> getAll() {
session.beginTransaction();
Query query = session.createQuery("select p from com.example.Person p");
List<Person> result;
result = query.list();
return result;
}
}
和personFormBean：
package com.example;
import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.faces.model.ListDataModel;
import javax.inject.Named;
@SessionScoped
@Named("personBean")
public class PersonFormBean implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private Person person = new Person();
private ListDataModel<Person> persons = new ListDataModel<Person>();
private personManager pm = new personManager();
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
public ListDataModel<Person> getAllPersons(){
persons.setWrappedData(pm.getAll());
return persons;
}
public String addPerson(){
pm.addPerson(person);
return null;
}
public String deletePerson(){
Person personToDelete=persons.getRowData();
pm.deletePerson(personToDelete);
return null;
}
}
这是我的hibernate配置文件：
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">michal12</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="javax.persistence.validation.mode">none</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping class="com.example.Person"/>
</session-factory>
</hibernate-configuration>
有人知道这里有什么问题吗？ 我会非常感谢你的帮助。
答案 0 :(得分：1)
Hibernate未扫描您的实体。在会话工厂中使用
<property name="packagesToScan" value="com.example" />
或
configuration.addPackage(packagesToScan);
并将@GeneratedValue添加到实体的id字段。