JPA 环境测试报错

Question

    最近在研究JPA，写了一个简单的测试类，但是测试结果报错了。我用的是junit4来测试的。相应的jar包及数据库驱动包都导入了。
         @Entity
        public class ProductType {
private int typeid;
public int getTypeid() {
return typeid;
}
        @Id @GeneratedValue(strategy=GenerationType.AUTO)
   public void setTypeid(int typeid) {
this.typeid = typeid;
}
       }
     
      persistence.xml 放在src 的一个META-INF文件下
        <?xml version="1.0"?>
<persistence 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_1_0.xsd" 
version="1.0">  <persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
   <properties>
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySql5Dialect"/>
    <property name="hibernate.connection.driver_class" value="org.git.mm.mysql.Driver"/>
<property name="hibe-rnate.connection.username" value="root"/>
<property name="hibernate.connection.password" value="123456"/>
    <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&amp;characterEncoding=UTF-8"/>
<property name="hibernate.max_fetch_depth" value="3"/>
    <!--  <property name="hibernate.max_fet-=ch_depth" value="3"/>-->
<property name="hibernate.hbm2ddl.auto" value="update"/>
<property name="hibernate.jdbc.fetch_size" value="18"/>
<property name="hibernate.jdbc.batch_size" value="10"/>
<property name="hibernate.show_sql" value="false"/>
<property name="hibernate.format_sql" value="false"/> 
</properties>
 </persistence-unit>
</persistence>  测试类如下
      public class ProductTest { @BeforeClass
public static void setUpBeforeClass() throws Exception {
}
    @Test
    public void runtest(){
      Persistence.createEntityManagerFactory("itcast");
    }
}
  一跑就报
     javax.persistence.PersistenceException: [PersistenceUnit: itcast] 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:52)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
at junit.test.ProductTest.runtest(ProductTest.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: bolink.bean.product.ProductType
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:671)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:534)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:286)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1115)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1225)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:159)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:854)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:191)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:253)
... 24 more

Answer 1

你应该看看你ProductType的hbm映射文件，是不是正确生成了ID属性，因为根源是：
bolink.bean.product.ProductType 没有定义id

Answer 2

持久化异常
你的ProductType.hbm.xml怎么没导入到配置文件里
hibernate根本找不到bolink.bean.product.ProductType 
然后Debug到底是那里错误

Answer 3

   Debug 了，直接报错啊
   
  

Answer 4

我试了一下测试通过。persistence.xml 跟你写得差不多，只是把 org.hibernate.dialect.MySql5Dialect 改成了
org.hibernate.dialect.MySQL5Dialect，其他跟你的基本上没有什么区别。我用的 MySQL 表结构是下面这样的：CREATE TABLE t_mt_stat (
  id         int(10) unsigned   NOT NULL auto_increment,
  mt_time    datetime           NOT NULL,
  stat       varchar(20)        NOT NULL,
  stat_time  datetime           NOT NULL,
  PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;persistence.xml 是这样的（几乎是抄你的）：
<?xml version="1.0"?>
<persistence 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_1_0.xsd"
  version="1.0">  <persistence-unit name="test" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
      <property name="hibe-rnate.connection.username" value="root" />
      <property name="hibernate.connection.password" value="" />
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8" />
      <property name="hibernate.max_fetch_depth" value="3" />
      <!--  <property name="hibernate.max_fet-=ch_depth" value="3"/>-->
      <property name="hibernate.hbm2ddl.auto" value="update" />
      <property name="hibernate.jdbc.fetch_size" value="18" />
      <property name="hibernate.jdbc.batch_size" value="10" />
      <property name="hibernate.show_sql" value="false" />
      <property name="hibernate.format_sql" value="false" />
    </properties>
  </persistence-unit>
</persistence>Entity 类是这样的：import java.util.Date;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;@Entity
@Table(name = "T_MT_STAT")
public class MtStat {
    
    private Integer id;
    private Date mtTime;
    private String stat;
    private Date statTime;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Integer getId() {
        return id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }
    
    @Column(name = "mt_time")
    @Temporal(TemporalType.TIMESTAMP)
    public Date getMtTime() {
        return mtTime;
    }
    
    public void setMtTime(Date mtTime) {
        this.mtTime = mtTime;
    }
    
    @Column(name = "stat")
    public String getStat() {
        return stat;
    }
    
    public void setStat(String stat) {
        this.stat = stat;
    }
    
    @Column(name = "stat_time")
    @Temporal(TemporalType.TIMESTAMP)
    public Date getStatTime() {
        return statTime;
    }
    
    public void setStatTime(Date statTime) {
        this.statTime = statTime;
    }
    
    public String toString() {
        return new StringBuilder().append("id: ").append(id)
            .append(", mt_time: ").append(mtTime == null ? "null" : String.format("%tF %<tT", mtTime))
            .append(", stat: ").append(stat)
            .append(", stat_time: ").append(statTime == null ? "null" : String.format("%tF %<tT", statTime))
            .toString();
    }
}测试类是：
import java.util.Date;
import java.util.List;import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;import com.bao.jpa.entity.MtStat;public class EntityManagerTest {
    
    private EntityManager em;
    
    @Before
    public void before() {
        EntityManagerFactory factory = Persistence.createEntityManagerFactory("test");
        Assert.assertNotNull(factory);
        
        em = factory.createEntityManager();
        Assert.assertNotNull(em);
    }
    
    @Test
    public void test() {        
        List<MtStat> list = getAllMtStats();
        Assert.assertNotNull(list);
        
        int count = list.size();
        
        persist();
        
        list = getAllMtStats();
        Assert.assertEquals(list.size(), count + 1);
    }
    
    @After
    public void after() {
        em = null;
    }
    
    @SuppressWarnings("unchecked")
    private List<MtStat> getAllMtStats() {
        String jpql = "SELECT m FROM MtStat m";
        Query query = em.createQuery(jpql);
        return query.getResultList();
    }
    
    private void persist() {
        EntityTransaction transaction = em.getTransaction();        
        try {
            transaction.begin();
            MtStat mt = new MtStat();
            mt.setMtTime(new Date());
            mt.setStat("N");
            mt.setStatTime(new Date());
            em.persist(mt);
            transaction.commit();
        } catch(Exception e) {
            transaction.rollback();
        }
    }
}

Answer 5

  谢谢bao110908  的回答
  非常感谢
  我马上结贴，分给你

Answer 6

 To bao110908 
  我给了你90分啊，怎么没有显示啊
 

Answer 7

@Id @GeneratedValue(strategy=GenerationType.AUTO)
public void setTypeid(int typeid) {
    this.typeid = typeid;
} 你把注解放到getTypid()方法上@Id @GeneratedValue(strategy=GenerationType.AUTO)
public int getTypeid() {
    return typeid ;
} 

Answer 8

package com.hydao.entity;import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;@Entity
public class ProductType {
  
private Integer typeid;
    
@Id @GeneratedValue(strategy=GenerationType.IDENTITY)
public Integer getTypeid() {
return typeid;
} public void setTypeid(Integer typeid) {
this.typeid = typeid;
}}
package com.hydao.junit.test;import javax.persistence.Persistence;import org.junit.BeforeClass;
import org.junit.Test;public class ProductTest { @BeforeClass
public static void setUpBeforeClass() throws Exception {
} @Test
public void runtest() {
Persistence.createEntityManagerFactory("itcast");
System.out.println("我很好   早啊 ");
}}<persistence 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_1_0.xsd"
version="1.0">
<!-- name  databaseName -->
<persistence-unit name="itcast" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.MySQL5Dialect" />
<!--
<property name="hibernate.format_sql" value="false"/>
<property name="hibernate.use_sql_comments" value="false"/>-->
<property name="hibernate.connection.driver_class"
value="org.git.mm.mysql.Driver" />
<property name="hibernate.connection.username" value="root" />
<property name="hibernate.connection.password" value="root" />
<property name="hibernate.connection.url"
value="jdbc:mysql://localhost:3306/itcast?useUnicode=true&amp;characterEncoding=UTF-8" />
<property name="hibernate.max_fetch_depth" value="3" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.show_sql" value="true" />
</properties>
</persistence-unit>
</persistence>抛出的异常信息是 :
javax.persistence.PersistenceException: 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:52)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
at junit.test.PersonTest.save(PersonTest.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)
at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)
at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)
at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)
at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)
at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)
at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)
at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
at org.hibernate.util.DTDEntityResolver.resolveInHibernateNamespace(DTDEntityResolver.java:104)
at org.hibernate.cfg.EJB3DTDEntityResolver.resolveEntity(EJB3DTDEntityResolver.java:53)
at com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntity(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.resolveDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at org.hibernate.ejb.packaging.PersistenceXmlLoader.loadURL(PersistenceXmlLoader.java:70)
at org.hibernate.ejb.packaging.PersistenceXmlLoader.deploy(PersistenceXmlLoader.java:89)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:222)
... 24 more怎么解决   谢谢  啦