[英]Hibernate Exception in thread “main” java.lang.ExceptionInInitializerError
[英]I got this error while running simple Hibernate application “Exception in thread ”main“ java.lang.ExceptionInInitializerError”
我是冬眠的新手,请在eclipse indigo和hibernate 4.3.10中尝试此简单代码。 我正在使用jre7。
我在consol中收到此错误日志
Jul 22, 2015 10:05:22 AM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
Jul 22, 2015 10:05:22 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.10.Final}
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.hibernate.cfg.Configuration.reset(Configuration.java:326)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:291)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:295)
at com.milind.hibernate.HibernateTest.createSessionFactory(HibernateTest.java:16)
at com.milind.hibernate.HibernateTest.main(HibernateTest.java:29)
Caused by: java.lang.NullPointerException
at org.hibernate.internal.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
at org.hibernate.cfg.Environment.<clinit>(Environment.java:221)
... 5 more
我尽力解决此错误,请为此提供帮助。 我是新手,要冬眠。
HibernateTest.java
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import com.milind.hibernate.dto.UserDetails;
public class HibernateTest {
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;
public static SessionFactory createSessionFactory() {
Configuration configuration = new Configuration();
configuration.configure();
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
}
public static void main(String[] args) {
UserDetails user = new UserDetails();
user.setUserId(1);
user.setUserName("Milind");
SessionFactory sessionFactory = createSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(user);
session.getTransaction().commit();
}
}
UserDetails.java
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class UserDetails {
@Id
private int userId;
private String userName;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
的hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3535/students</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.autocommit">true</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<!-- Mapping files -->
<mapping class="com.milind.hibernate.dto.UserDetails"/>
问题 :休眠配置文件hibernate.cfg.xml在类路径中不可用。
解决方案:将hibernate.cfg.xml文件添加到类路径。
如果您的休眠配置文件未命名为“ hibernate.cfg.xml”,那么您还需要指定配置文件的名称。
Configuration cfg=new Configuration();
cfg.configure("filePath/your-config-file-name.cfg.xml");
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