Hibernate，JPA，MySQL：無法構建EntityManagerFactory

這是我第一次使用hibernate/JPA2。我正在「無法構建EntityManagerFactory」。你能告訴我問題在哪裏嗎？Hibernate，JPA，MySQL：無法構建EntityManagerFactory

這裏是我的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>

這裏是我的測試類：

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!");   
}

}

這裏的持久化實體之一：

@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; 
}

在這裏，其他：

@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; 
}

這裏是Maven的依賴關係：

<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>

當我嘗試「行家測試」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)

這裏是輸出從測試中，我發現它在肯定的報告中：

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

來源

2013-07-28 Nick

確保堆棧跟蹤已完成，並向我們顯示兩個實體的代碼。 –

剛剛添加了實體的代碼和測試的輸出 – Nick

您沒有爲XmlConversion的屬性createdAt定義任何setter方法。

來源

2013-07-28 15:19:25

你是對的 - 當我添加EM工廠的創建方法時。我收到了一條不同的錯誤信息（我現在會看看它），但是原來的錯誤消除了。我沒有添加setter方法，因爲這被認爲是時間戳字段，我想將它設置在數據庫級別。我沒有意識到這是由於它改變了班級的簽名造成的問題。恥辱的錯誤消息是如此不明確。非常感謝你！ – Nick

由於您註釋了getters而不是字段，Hibernate使用setter填充您的實體。如果它沒有setter，它不能填充屬性。您可以使setter受到保護或受到軟件包保護，甚至可以使私有IIRC受保護。 –

你的意思是說，如果我註釋了字段（而不是getter方法），即使setter方法被省略，問題也不會出現？ – Nick

Hibernate，JPA，MySQL：無法構建EntityManagerFactory

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