Hibernate、JPA、MySQL：无法构建 EntityManagerFactory

【问题标题】：Hibernate, JPA, MySQL: Unable to build EntityManagerFactoryHibernate、JPA、MySQL：无法构建 EntityManagerFactory
【发布时间】：2013-07-28 08:26:42
【问题描述】：

这是我第一次玩hibernate/JPA2。我收到“无法构建 EntityManagerFactory”。你能告诉我问题出在哪里吗？

这是我的 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="pdfEx" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>iw.pdfEx.persistence.Pdf</class>
    <class>iw.pdfEx.persistence.XmlConversion</class>
    <properties>
        <property name="hibernate.connection.username" value="icite"/>
        <property name="hibernate.connection.password" value="${hpass}"/>
        <property name="hibernate.connection.url" value="${hurl}"/>
        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
    </properties>
</persistence-unit>

这是我的测试类：

public class PersistenceTest {

private static EntityManagerFactory emf;
private static EntityManager em;
private static String randomPDFname;
private static String randomGITversion;
private static long sysTime = 0;

@BeforeClass
public static void createEntityManagerFactory() {
    Logger.getLogger(FileConverter.class.getName()).log(Level.INFO, "hibernate URL is "+System.getProperty("hurl"));           
    Logger.getLogger(FileConverter.class.getName()).log(Level.INFO, "the path to pdf2xml is "+System.getProperty("pdf2xml"));          
    emf = Persistence.createEntityManagerFactory("pdfEx");
    Logger.getLogger(FileConverter.class.getName()).log(Level.INFO, "PersistenceTest: EM factory created!");           
    randomPDFname = "random-pdf-name-"+UUID.randomUUID().toString();
    randomGITversion = "random-git-version-"+UUID.randomUUID().toString();
    sysTime = Math.round(System.currentTimeMillis()/((10^3)*3600));//systime in hours, rather than millisecs
}

@Before
public void beginTransaction() {
    em = (EntityManager) Persistence.createEntityManagerFactory("pdfEx").createEntityManager();
    em.getTransaction().begin();
}

@After
public void rollbackTransaction() {

    if (em.getTransaction().isActive())
        em.getTransaction().rollback();

    if (em.isOpen())
        em.close();
}

@AfterClass
public static void closeEntityManagerFactory() {
    emf.close();
}

@Test
public void dbTest() {
    //fail("Not yet implemented");
    Pdf testPdf = new Pdf();
    testPdf.setName(randomPDFname);
    testPdf.setSize(sysTime);       
    //check that testPDF is, indeed, not yet in the DB:
    Query getPDF = em.createNamedQuery("Pdf.Queries.PdfByNameAndSize");
    getPDF.setParameter("pdfname", testPdf.getName());
    getPDF.setParameter("pdfsize", testPdf.getSize());
    List foundPDFs = getPDF.getResultList();
    assertTrue("Random PDF "+randomPDFname+" is already in the DB", foundPDFs == null || foundPDFs.size() == 0 );
    //persist testPdf in the DB
    em.persist(testPdf);
    //em.flush();
    Logger.getLogger(FileConverter.class.getName()).log(Level.INFO, "Persisted testPdf");
    //retrieve testPdf from the DB
    Pdf thePDF = (Pdf) getPDF.getSingleResult();//trying to re-run the query
    //and use it as a reference in a new XmlConversion
    XmlConversion testXml = new XmlConversion();
    testXml.setGitVersion(randomGITversion);
    testXml.setPdf(thePDF);
    testXml.setXmlOutputSize(sysTime);
    //verify there is no such XmlConversion
    Query getXML = em.createNamedQuery("XmlConversion.Queries.XmlByPdfAndGit");
    getXML.setParameter("pdfname", testXml.getPdf());
    getXML.setParameter("gitversion", testXml.getGitVersion());
    List foundXMLs = getXML.getResultList();
    assertTrue("XmlConversion is already in the DB", foundXMLs == null || foundXMLs.size() == 0 );
    //store XmlConversion in the DB
    em.persist(testXml);
    //em.flush();
    //retrieve XmlConversion from the DB
    foundXMLs = getXML.getResultList();
    assertTrue("XmlConversion is not in the DB", foundXMLs.size() == 1);
    Logger.getLogger(FileConverter.class.getName()).log(Level.INFO, "PersistenceTest successful!");        
}

}

这里是可持久实体之一：

@Entity @NamedQuery(
    name="Pdf.Queries.PdfByNameAndSize",
    query="SELECT c FROM Pdf c WHERE c.name = :pdfname AND c.size = :pdfsize") @Table(name = "t_pdf") public class Pdf implements java.io.Serializable {    @Column(nullable=false)
private Integer id;
@Column(nullable=false)
private String name;
@Column(nullable=false)
private Long size;
private Set<XmlConversion> xmlConversions = new HashSet<XmlConversion>(0);

public Pdf() {
}

public Pdf(String name, Long size) {
    this.name = name;
    this.size = size;
}

public Pdf(String name, Long size, Set<XmlConversion> xmlConversions) {
    this.name = name;
    this.size = size;
    this.xmlConversions = xmlConversions;
}

@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
    return this.id;
}

public void setId(Integer id) {
    this.id = id;
}

@Column(name = "name", nullable = false, length = 245)
public String getName() {
    return this.name;
}

public void setName(String name) {
    this.name = name;
}

@Column(name = "size", nullable = false, length = 16777215)
public Long getSize() {
    return this.size;
}

public void setSize(Long size) {
    this.size = size;
}

@OneToMany(fetch = FetchType.LAZY, mappedBy = "pdf")
public Set<XmlConversion> getXmlConversions() {
    return this.xmlConversions;
}

public void setXmlConversions(Set<XmlConversion> xmlConversions) {
    this.xmlConversions = xmlConversions;
}

这里是另一个：

@Entity @NamedQuery(
    name="XmlConversion.Queries.XmlByPdfAndGit",
    query="SELECT c FROM XmlConversion c WHERE c.pdf = :pdfname AND c.gitVersion = :git" ) @Table(name = "t_xml_conversion") public class XmlConversion implements java.io.Serializable {

private Integer id;
private Pdf pdf;
private Long xmlOutputSize;
private String gitVersion;
private Integer durationMillisec;
private Date createdAt;

public XmlConversion() {
}

public XmlConversion(Pdf pdf, String gitVersion) {
    this.pdf = pdf;
    this.gitVersion = gitVersion;
}

public XmlConversion(Pdf pdf, Long xmlOutputSize, String gitVersion,
        Integer durationMillisec) {
    this.pdf = pdf;
    this.xmlOutputSize = xmlOutputSize;
    this.gitVersion = gitVersion;
    this.durationMillisec = durationMillisec;
}

@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
    return this.id;
}

public void setId(Integer id) {
    this.id = id;
}

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "PDF_id", nullable = false)
public Pdf getPdf() {
    return this.pdf;
}

public void setPdf(Pdf pdf) {
    this.pdf = pdf;
}

@Column(name = "xml_output_size")
public Long getXmlOutputSize() {
    return this.xmlOutputSize;
}

public void setXmlOutputSize(Long xmlOutputSize) {
    this.xmlOutputSize = xmlOutputSize;
}

@Column(name = "git_version", nullable = false, length = 45)
public String getGitVersion() {
    return this.gitVersion;
}

public void setGitVersion(String gitVersion) {
    this.gitVersion = gitVersion;
}

@Column(name = "duration_millisec")
public Integer getDurationMillisec() {
    return this.durationMillisec;
}

@Column(name = "created_at", nullable = false, columnDefinition="TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
public Date getCreatedAt() {
    return this.createdAt;
}

public void setDurationMillisec(Integer durationMillisec) {
    this.durationMillisec = durationMillisec;
}

这里是maven依赖：

  <dependencies>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.10</version>
  <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.apache.directory.studio</groupId>
    <artifactId>org.apache.commons.io</artifactId>
    <version>2.4</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.25</version>
</dependency>
<dependency>
    <groupId>org.hibernate.javax.persistence</groupId>
    <artifactId>hibernate-jpa-2.0-api</artifactId>
    <version>1.0.1.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.2.3.Final</version>
    <scope>runtime</scope>
</dependency>

当我尝试“maven test”时，我得到：

iw.pdfEx.PersistenceTest  Time elapsed: 3.156 sec  <<< ERROR! javax.persistence.PersistenceException: [PersistenceUnit: pdfEx] Unable to build EntityManagerFactory
at org.hibernate.property.BasicPropertyAccessor.createSetter(BasicPropertyAccessor.java:252)
at org.hibernate.property.BasicPropertyAccessor.getSetter(BasicPropertyAccessor.java:245)
at org.hibernate.mapping.Property.getSetter(Property.java:326)
at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertySetter(PojoEntityTuplizer.java:444)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:201)
at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:82)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:135)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:188)
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:341)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:507)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:146)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:163)
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:135)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:385)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1769)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
at iw.pdfEx.PersistenceTest.createEntityManagerFactory(PersistenceTest.java:42)

这是我在肯定报告中找到的测试输出：

Jul 28, 2013 12:11:25 PM iw.pdfEx.PersistenceTest createEntityManagerFactory 
INFO: hibernate URL is jdbc:mysql://localhost:8600/icite Jul 28, 2013 12:11:25 PM iw.pdfEx.PersistenceTest createEntityManagerFactory
INFO: the path to pdf2xml is /home/nikolay/Documents/invoiceFairy/pdf2xml/pdftoxml.linux64.exe.1.2_7 Jul 28, 2013 12:11:26 PM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.2.Final} Jul 28, 2013 12:11:26 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.2.3.Final} Jul 28, 2013 12:11:26 PM org.hibernate.cfg.Environment <clinit> INFO: HHH000206: hibernate.properties not found Jul 28, 2013 12:11:26 PM org.hibernate.cfg.Environment buildBytecodeProvider    INFO: HHH000021: Bytecode provider name : javassist Jul 28, 2013 12:11:27 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure    INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!) Jul 28, 2013 12:11:27 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure    INFO: HHH000115: Hibernate connection pool size: 20 Jul 28, 2013 12:11:27 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: true Jul 28, 2013 12:11:27 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:8600/icite] Jul 28, 2013 12:11:27 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=icite, password=****, autocommit=true, release_mode=auto} Jul 28, 2013 12:11:27 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect Jul 28, 2013 12:11:28 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory Jul 28, 2013 12:11:28 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory

【问题讨论】：

  • 确保堆栈跟踪完整，并向我们展示您的两个实体的代码。
  • 刚刚添加了实体的代码和测试的输出

标签： mysql hibernate maven jpa junit


【解决方案1】：

您没有为属性createdAt 的XmlConversion 定义任何setter 方法。

【讨论】：

  • 你是对的 - 当我添加创建 EM 工厂的方法时。我收到一条不同的错误消息（我现在会看一下），但原来的错误已被消除。我没有添加 setter 方法，因为这被认为是时间戳字段，我想在 DB 级别设置它。我没有意识到这会导致问题，因为它会更改类的签名。遗憾的是错误消息是如此不具体。非常感谢！
  • 由于您注释了 getter 而不是字段，Hibernate 使用 setter 来填充您的实体。如果它没有设置器，则无法填充该属性。您可以使 setter 受保护或包保护，甚至是私有 IIRC。
  • 你的意思是如果我注释了字段（而不是getter方法）即使省略了setter方法也不会出现问题？
  • 是的。因为在这种情况下，Hibernate 将使用字段访问类型而不是属性访问类型：它将直接填充字段，而不通过设置器。另一种方法是使用@Access JPA 注释。如果您使用它，请确保仅在字段上使用注释（混合带注释的字段和带注释的方法将不起作用：其中一个位置将被忽略）。此外，在读取字段以将它们写入数据库时​​，访问类型也将是字段。不仅在使用来自数据库的值编写它们时。
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