我正在开始一个新项目，这是我第一次使用 Hibernate 4 并在没有 hibernate 模板的情况下使用 Spring 3。
这是我的两个实体类：（这似乎发生在所有实体类上）
/**
* Tweener to connect multiple dictionary entries in various ways
* @author thom
*/
@Entity
@Table( name = "CROSS_REF",
uniqueConstraints= @UniqueConstraint(columnNames = {"FROM_ENTRY_UUID", "TO_ENTRY_UUID", "XREF_TYPE"})
)
public class CrossReference extends Pojo
implements Comparable<CrossReference>{
/**
* Cross reference types
* @author thom
*/
public enum XrefType{
/**
* Another way to spell this word
*/
alternateSpelling,
/**
* Word you get by adding or removing a letter
*/
hook,
/**
* Root word with additional endings
*/
variation
}
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "FROM_ENTRY_UUID", referencedColumnName = "UUID", nullable=false)
private DictionaryEntry fromEntry;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "TO_ENTRY_UUID", referencedColumnName = "UUID", nullable=false)
private DictionaryEntry toEntry;
@Column(name = "XREF_TYPE", nullable = false)
private XrefType xrefType;
...
它是超级类：
/**
* Base class for all POJO objects
* @author Heavyweight software
*/
public class Pojo {
public static final long EMPTYUUID = -1;
/**
* Convert a calendar into a formatted timestamp useful for display
* @param date the calendar being strung
* @return a standardized time stamp version of a calendar
*/
@Transient
public static String getTimestamp(Calendar date) {
if(date==null){
return "";
}
DateFormat formatter = DateFormat.getDateTimeInstance();
String str = formatter.format(date.getTime());
return str;
}
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "UUID", nullable = false, unique = true)
protected Long uuid = EMPTYUUID;
这是我的错误：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testSessionFactory' defined in URL [file:/home/thom/workspace/LexDataAccess/bin/config/test-dao-spring.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.heavyweight.lexaholic.model.lexicon.CrossReference
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1486)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at com.heavyweight.lexaholic.dao.hibernate.HibernateTestSchema.initBeanFactory(HibernateTestSchema.java:42)
at com.heavyweight.lexaholic.dao.hibernate.HibernateTestSchema.getBeanFactory(HibernateTestSchema.java:50)
at com.heavyweight.lexaholic.dao.hibernate.HibernateTestSchema.getDictionaryEntryDAO(HibernateTestSchema.java:74)
at com.heavyweight.lexaholic.dao.hibernate.lexicon.DictionaryEntryHibernateDAOTest.setUp(DictionaryEntryHibernateDAOTest.java:31)
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:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.heavyweight.lexaholic.model.lexicon.CrossReference
at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:277)
at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:224)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:664)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3448)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3402)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1330)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1729)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1780)
at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:242)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:372)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:357)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1483)
... 34 more
我所做的所有研究都表明此错误是由缺少@Id 引起的，但是，正如您所看到的，我有它。是基类和 Hibernate 4 的问题吗？