Java Hibernate 简单示例中的错误初学者级别
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Error in Hibernate simple example Beginner level
提问by Eric
In order to learn hibernate, I write two examples for practising. However, both of them have same error as following:
为了学习hibernate，我写了两个例子来练习。但是，它们都具有以下相同的错误：
Failed to create sessionFactory object.java.lang.NoClassDefFoundError: javax/transaction/SystemException Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.lang.NoClassDefFoundError: javax/transaction/SystemException at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.jboss.logging.Logger.getMessageLogger(Logger.java:2248) at org.jboss.logging.Logger.getMessageLogger(Logger.java:2214) at org.hibernate.cfg.Configuration.(Configuration.java:184) at com.example.ManageEmployee.main(ManageEmployee.java:17)
无法创建 sessionFactory object.java.lang.NoClassDefFoundError: javax/transaction/SystemException 异常在线程“main” java.lang.ExceptionInInitializerError 引起的：java.lang.NoClassDefFoundError: javax/transaction/SystemException at java.lang.Class.forName0 (Native Method) at java.lang.Class.forName(Unknown Source) at org.jboss.logging.Logger.getMessageLogger(Logger.java:2248) at org.jboss.logging.Logger.getMessageLogger(Logger.java:2214)在 org.hibernate.cfg.Configuration.(Configuration.java:184) 在 com.example.ManageEmployee.main(ManageEmployee.java:17)
Basically, I write POJO first, and using eclipse generates hbm.xml. After than, I write main function to manage the database. I tried twice but got same problem.
基本上我先写POJO，用eclipse生成hbm.xml。之后，我编写了main函数来管理数据库。我尝试了两次，但遇到了同样的问题。
Could someone give me advice to solve this problem? Before that, using JDBC builds a project, but that is too complex. So I need to learn hibernate. Thank you.
有人可以给我建议来解决这个问题吗？在此之前，使用JDBC构建一个项目，但那太复杂了。所以我需要学习hibernate。谢谢你。
Supplement(detail in this hibernate example project):
补充（此休眠示例项目中的详细信息）：
- My Eclipse project Name: HibernateExa
hibernate.cfg.xml:
<session-factory> <!-- hibernate dialect --> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.password">hibernateTest</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernatetest;</property> <property name="hibernate.connection.username">hibernater</property> <property name="hibernate.default_schema">hibernatetest</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Automatic schema creation(begin) --> <property name="hibernate.hbm2ddl.auto">create</property> <!-- Simple memory-only cache --> <property name="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- mapping files with external dependencies --> <mapping resource="com/sample/Person.hbm.xml"/> </session-factory>My POJO is Person.java. Using eclipse generates Person.hbm.xml.
Project contains main function: TestPerson.java
public static void main(String [] args){ Session session = SessionFactoryUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); createPerson(session); queryPerson(session); } public static void createPerson(Session session){ Person person = new Person(); person.setName("Hyman"); person.setSurname("Yu"); person.setAddress("White House"); session.save(person); } private static void queryPerson(Session session){ Query query = session.createQuery("from person"); List<Person> list = new ArrayList<Person>(); list = query.list(); java.util.Iterator<Person> iter = list.iterator(); while(iter.hasNext()){ Person person = iter.next(); System.out.println("Person: \"" + person.getName() + "\", "+ person.getSurname() + "\", " + person.getAddress()); } session.getTransaction().commit(); }Here is error info:
Initial SessionFactory creation failed. java.lang.NoClassDefFoundError: javax/persistence/EntityListeners Exception in thread "main" java.lang.ExceptionInInitializerError at com.sample.SessionFactoryUtil.(SessionFactoryUtil.java:17) at com.sample.TestPerson.main(TestPerson.java:14) Caused by: java.lang.NoClassDefFoundError: javax/persistence/EntityListeners at org.hibernate.cfg.annotations.reflection.JPAMetadataProvider.getDefaults(JPAMetadataProvider.java:97) at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.getDefaults(JavaReflectionManager.java:226) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1331) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1756) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840) at com.sample.SessionFactoryUtil.(SessionFactoryUtil.java:13) ... 1 more Caused by: java.lang.ClassNotFoundException: javax.persistence.EntityListeners at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 7 more
- 我的 Eclipse 项目名称：HibernateExa
hibernate.cfg.xml:
<session-factory> <!-- hibernate dialect --> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.password">hibernateTest</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernatetest;</property> <property name="hibernate.connection.username">hibernater</property> <property name="hibernate.default_schema">hibernatetest</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Automatic schema creation(begin) --> <property name="hibernate.hbm2ddl.auto">create</property> <!-- Simple memory-only cache --> <property name="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- mapping files with external dependencies --> <mapping resource="com/sample/Person.hbm.xml"/> </session-factory>我的 POJO 是Person.java。使用 eclipse 生成Person.hbm.xml。
项目包含主要功能：TestPerson.java
public static void main(String [] args){ Session session = SessionFactoryUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); createPerson(session); queryPerson(session); } public static void createPerson(Session session){ Person person = new Person(); person.setName("Hyman"); person.setSurname("Yu"); person.setAddress("White House"); session.save(person); } private static void queryPerson(Session session){ Query query = session.createQuery("from person"); List<Person> list = new ArrayList<Person>(); list = query.list(); java.util.Iterator<Person> iter = list.iterator(); while(iter.hasNext()){ Person person = iter.next(); System.out.println("Person: \"" + person.getName() + "\", "+ person.getSurname() + "\", " + person.getAddress()); } session.getTransaction().commit(); }这是错误信息：
初始 SessionFactory 创建失败。java.lang.NoClassDefFoundError: javax/persistence/EntityListeners Exception in thread "main" java.lang.ExceptionInInitializerError at com.sample.SessionFactoryUtil.(SessionFactoryUtil.java:17) at com.sample.TestPerson.main(TestPerson.java:14) ) 引起：java.lang.NoClassDefFoundError: javax/persistence/EntityListeners at org.hibernate.cfg.annotations.reflection.JPAMetadataProvider.getDefaults(JPAMetadataProvider.java:97) at org.hibernate.annotations.common.reflection.java.JavaReflectionManager .getDefaults(JavaReflectionManager.java:226) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1331) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1756) at org.hibernate.cfg。 Configuration.buildSessionFactory(Configuration.java:
Basically, this example could help me to practise how to using hibernate. Nevertheless, I got problem at the very beginning that create the project.
基本上，这个例子可以帮助我练习如何使用休眠。尽管如此，我在创建项目的一开始就遇到了问题。
Hopefully, I could solve this problem soon. Please some advice, Thank you.
希望我能尽快解决这个问题。请给点建议，谢谢。
采纳答案by Ima Miri
Please make sure you have all of this jar files in your lib folder:
请确保您的 lib 文件夹中有所有这些 jar 文件：
lib/antlr.jar
lib/cglib.jar
lib/asm.jar
lib/commons-collections.jar
lib/commons-logging.jar
lib/jta.jar
lib/dom4j.jar
lib/log4j.jar
lib/hibernate3.jar
回答by Eric
Problem is solved! Thanks for everyone's advice.
问题解决了！谢谢大家的建议。
So I summary the issue and give the solution.
所以我总结了这个问题并给出了解决方案。
ERROR: Initial SessionFactory creation failed. java.lang.NoClassDefFoundError. some jar files are misssing.
错误：初始 SessionFactory 创建失败。java.lang.NoClassDefFoundError。缺少一些 jar 文件。
In order to set hibernate project, here is the list for jar files:
为了设置休眠项目，这里是 jar 文件的列表：
- Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: person is not mapped [from person] Because hibernate query is based on Object, from person should be from Person.
The correct connection url:
jdbc:mysql://localhost:3306/hibernatetest?useUnicode=true&characterEncoding=GBK
In DB, the id is INT. However, in Person.hbm.xml I change id type to "long". Thus, the expected result comes out.
- 线程“main”中的异常 org.hibernate.hql.ast.QuerySyntaxException：person 未映射 [from person] 因为休眠查询是基于 Object 的，所以 from person 应该来自 Person。
正确的连接网址：
jdbc:mysql://localhost:3306/hibernatetest?useUnicode=true&characterEncoding=GBK
在 DB 中，id 是 INT。但是，在 Person.hbm.xml 中，我将 id 类型更改为“long”。这样，预期的结果就出来了。
回答by Sai prateek
Add this dependency in your pom.xml
在您的 pom.xml 中添加此依赖项
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
Make a mvn clean installand deploy.
制作mvn clean install并部署。
Another way:
Download this jar: Project -->right click --> build path --> add external jar
另一种方式：
下载这个jar：项目-->右键单击-->构建路径-->添加外部jar
Project-->right click -->properties --> deployment assembly --> add --> add from build path entries (add this jar)
项目-->右键单击-->属性-->部署程序集-->添加-->从构建路径条目添加（添加这个jar）
Now re build the project.
现在重新构建项目。
Hope it will help.
希望它会有所帮助。
回答by Amit Mishra
Place below dependency inside your pom.xml or add persistence-api jar in your classpath.
将下面的依赖项放在 pom.xml 中或在类路径中添加 persistence-api jar。
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
</dependency>
