Java Hibernate 无法实例化默认 tuplizer - 找不到 getter

Hibernate unable to instantiate default tuplizer - cannot find getter

提问by ZeldaPinwheel

I'm trying to use Hibernate to persist a class that looks like this:

我正在尝试使用 Hibernate 来持久化一个如下所示的类：

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;
}

My Hibernate mapping file contains the following:

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>

When I try to run, I get error messages indicating there is no getter function for the purchaseDate attribute:

当我尝试运行时，我收到错误消息，指示 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.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

I'm new to Hibernate, so I don't know all the ins and outs, but I do have the getter and setter for the purchaseDate attribute. I don't know what I'm missing here - does anyone else?

我是 Hibernate 的新手，所以我不知道所有的来龙去脉，但我确实有 purchaseDate 属性的 getter 和 setter。我不知道我在这里错过了什么 - 还有其他人吗？

回答by Matt Solnit

It looks like the problem is probably in the capitalization: setPurchasedate()should be setPurchaseDate()(with a capital "D").

看起来问题可能出在大写上： setPurchasedate()应该是setPurchaseDate()（大写“D”）。

回答by Guillaume

Further on down the stack trace, it says this:

在堆栈跟踪的进一步下方，它说：

missing a getter for puchaseDate

You might want to check for typos ;) You're missing an R and setPurchasedate should be setPurchaseDate

您可能想检查拼写错误 ;) 您缺少一个 R 并且 setPurchasedate 应该是 setPurchaseDate

回答by smentek

It came to me once without any typos. I've added javassist.jarto classpath and it solved the problem.

它出现在我面前，没有任何错别字。我已经将javassist.jar添加到类路径中，它解决了这个问题。

回答by bluish

If it can help someone:

如果它可以帮助某人：

In my case there were errors in my mapping files. Classes were not referenced by their full package names. I did this mistake because I generated the mappings when my bean classes belonged to the default package (hence no package name; e.g.: Orderinstead of com.mypackage.Order) and then I moved my bean classes to package (in the example com.mypackage). Unfortunately mapping files did not changed accordingly with the new package definition.

就我而言，我的映射文件中存在错误。类没有被它们的完整包名引用。我犯了这个错误，因为当我的 bean 类属于默认包时我生成了映射（因此没有包名称；例如：Order而不是com.mypackage.Order）然后我将我的 bean 类移动到包（在示例中com.mypackage）。不幸的是，新的包定义并没有相应地更改映射文件。

My hint is redo Hibernate reverse engineering and see what it produces, comparing it with your current mapping files.

我的提示是重做 Hibernate 逆向工程，看看它产生了什么，将它与您当前的映射文件进行比较。

回答by user311121

I experienced the

我经历了

Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]

because I had a momentary lapse of donkeyness when renaming a field on a POJO that I had previously mapped.

因为在重命名我之前映射的 POJO 上的字段时，我有一瞬间的失态。

I changed the Java attribute name with my trusty IDE refactor hotkey, which does notalso change the getter & setter method names. I changed the getter (because it caught my attention with its @Column annotation that I also needed to address because the table column name was changing).

我使用可信赖的 IDE 重构热键更改了 Java 属性名称，这也不会更改 getter 和 setter 方法名称。我更改了 getter（因为它的 @Column 注释引起了我的注意，我也需要解决该注释，因为表列名称正在更改）。

I neglected, however, to change the setter, and that was the cause of the error.

但是，我忽略了更改设置器，这就是错误的原因。

回答by Majid

Pay attention to method name,It is case sensitive!

注意方法名，区分大小写！

In my case,it could not recognize getter very well; my property name was uIdand I used getUIdname for getter name and when I changed it to getuIdproblem solved!

就我而言，它无法很好地识别吸气剂；我的属性名称是uId，我使用getUIdname 作为 getter 名称，当我将其更改为getuId问题解决时！

回答by Inam Soomro

I included java assit.jar and it worked

我包含了 java assit.jar 并且它起作用了

<dependency>
    <groupId>javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.12.1.GA</version>
</dependency>