我正在尝试使用Hibernate来保持一个看起来像这样的类：
public class Item implements Serializable, Comparable<Item> {
// Item id
private Integer id;
// Description of item in inventory
private String description;
// Number of items described by this inventory item
private int count;
//Category item belongs to
private String category;
// Date item was purchased
private GregorianCalendar purchaseDate;
public Item() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public GregorianCalendar getPurchaseDate() {
return purchaseDate;
}
public void setPurchasedate(GregorianCalendar purchaseDate) {
this.purchaseDate = purchaseDate;
}
我的Hibernate映射文件包含以下内容：
<property name="puchaseDate" type="java.util.GregorianCalendar">
<column name="purchase_date"></column>
</property>
当我尝试运行时，我收到错误消息，指出purchaseDate属性没有getter函数：
577 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - Using Hibernate built-in connection pool (not for production use!)
577 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - Hibernate connection pool size: 20
577 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - autocommit mode: false
592 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost:3306/home_inventory
592 [main] INFO org.hibernate.connection.DriverManagerConnectionProvider - connection properties: {user=root, password=****}
1078 [main] INFO org.hibernate.cfg.SettingsFactory - RDBMS: MySQL, version: 5.1.45
1078 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-5.1.12 ( Revision: ${bzr.revision-id} )
1103 [main] INFO org.hibernate.dialect.Dialect - Using dialect: org.hibernate.dialect.MySQLDialect
1107 [main] INFO org.hibernate.engine.jdbc.JdbcSupportLoader - Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
1109 [main] INFO org.hibernate.transaction.TransactionFactoryFactory - Using default transaction strategy (direct JDBC transactions)
1110 [main] INFO org.hibernate.transaction.TransactionManagerLookupFactory - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
1110 [main] INFO org.hibernate.cfg.SettingsFactory - Automatic flush during beforeCompletion(): disabled
1110 [main] INFO org.hibernate.cfg.SettingsFactory - Automatic session close at end of transaction: disabled
1110 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC batch size: 15
1110 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC batch updates for versioned data: disabled
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Scrollable result sets: enabled
1111 [main] INFO org.hibernate.cfg.SettingsFactory - JDBC3 getGeneratedKeys(): enabled
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Connection release mode: auto
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Maximum outer join fetch depth: 2
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Default batch fetch size: 1
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Generate SQL with comments: disabled
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Order SQL updates by primary key: disabled
1111 [main] INFO org.hibernate.cfg.SettingsFactory - Order SQL inserts for batching: disabled
1112 [main] INFO org.hibernate.cfg.SettingsFactory - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
1113 [main] INFO org.hibernate.hql.ast.ASTQueryTranslatorFactory - Using ASTQueryTranslatorFactory
1113 [main] INFO org.hibernate.cfg.SettingsFactory - Query language substitutions: {}
1113 [main] INFO org.hibernate.cfg.SettingsFactory - JPA-QL strict compliance: disabled
1113 [main] INFO org.hibernate.cfg.SettingsFactory - Second-level cache: enabled
1113 [main] INFO org.hibernate.cfg.SettingsFactory - Query cache: disabled
1113 [main] INFO org.hibernate.cfg.SettingsFactory - Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory
1113 [main] INFO org.hibernate.cfg.SettingsFactory - Optimize cache for minimal puts: disabled
1114 [main] INFO org.hibernate.cfg.SettingsFactory - Structured second-level cache entries: disabled
1117 [main] INFO org.hibernate.cfg.SettingsFactory - Echoing all SQL to stdout
1118 [main] INFO org.hibernate.cfg.SettingsFactory - Statistics: disabled
1118 [main] INFO org.hibernate.cfg.SettingsFactory - Deleted entity synthetic identifier rollback: disabled
1118 [main] INFO org.hibernate.cfg.SettingsFactory - Default entity-mode: pojo
1118 [main] INFO org.hibernate.cfg.SettingsFactory - Named query checking : enabled
1118 [main] INFO org.hibernate.cfg.SettingsFactory - Check Nullability in Core (should be disabled when Bean Validation is on): enabled
1151 [main] INFO org.hibernate.impl.SessionFactoryImpl - building session factory
org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:110)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:135)
at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:80)
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:323)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:475)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:133)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:295)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
at service.HibernateSessionFactory.currentSession(HibernateSessionFactory.java:53)
at service.ItemSvcHibImpl.generateReport(ItemSvcHibImpl.java:78)
at service.test.ItemSvcTest.testGenerateReport(ItemSvcTest.java:226)
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 junit.framework.TestCase.runTest(TestCase.java:164)
at junit.framework.TestCase.runBare(TestCase.java:130)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:120)
at junit.framework.TestSuite.runTest(TestSuite.java:230)
at junit.framework.TestSuite.run(TestSuite.java:225)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
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: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:107)
... 29 more
Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for puchaseDate in class domain.Item
at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:328)
at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:321)
at org.hibernate.mapping.Property.getGetter(Property.java:304)
at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:299)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:158)
at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:77)
... 34 more
我是Hibernate的新手，所以我不知道所有的细节，但我确实有buyDate属性的getter和setter。我不知道我在这里缺少什么 - 还有其他人吗？
答案 0 :(得分：35)
有一次没有任何错别字来找我。我已经将 javassist.jar 添加到了classpath中，它解决了这个问题。
答案 1 :(得分：16)
继续沿堆栈跟踪，它说：
missing a getter for puchaseDate
你可能想检查拼写错误;）你错过了一个R和setPurchasedate应该是setPurchaseDate
答案 2 :(得分：5)
看起来问题可能在大写中：setPurchasedate()应为setPurchaseDate()（大写字母为“D”）。
答案 3 :(得分：4)
如果它可以帮助某人：
在我的情况下，我的地图文件中存在错误。类的完整包名称未引用类。我犯了这个错误，因为我在我的bean类属于默认包时生成了映射（因此没有包名;例如：Order而不是com.mypackage.Order）然后我将我的bean类移动到包（在示例com.mypackage）。不幸的是，映射文件没有相应地改变新的包定义。
我的提示是重做Hibernate逆向工程并查看它产生的内容，并将其与您当前的映射文件进行比较。
答案 4 :(得分：3)
注意方法名称，区分大小写！
在我的情况下，它无法很好地识别吸气剂;我的媒体资源名称为uId，我使用getUId名称作为getter名称，当我将其更改为getuId时，问题已解决！
答案 5 :(得分：3)
我包含java assist.jar并且它有用
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.1.GA</version>
</dependency>
答案 6 :(得分：2)
我经历过
Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
因为我在以前映射的POJO上重命名一个字段时，我的驴子瞬间失效。
我用可靠的IDE重构热键更改了Java属性名称，而不也改变了getter＆amp; setter方法名称。我更改了getter（因为它引起了我的注意，我还需要解决它的@Column注释，因为表列名称正在改变）。
但是，我忽略了改变设定者，这就是错误的原因。