Question

我刚开始休眠，所以不知道该怎么办，这是错误日志，我不知道要发布哪个部分，所以我最终发布了整个错误日志：

Dec 01, 2018 7:07:51 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.3.7.Final}
Dec 01, 2018 7:07:51 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Dec 01, 2018 7:07:52 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
Dec 01, 2018 7:07:52 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Exception in thread "main" org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:179)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:119)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:84)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:474)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:85)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:689)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
    at config.DbConfig.<init>(DbConfig.java:16)
    at model.dao.ProductDAO.<init>(ProductDAO.java:17)
    at com.vinodh.ProjectBE.App.main(App.java:15)
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [org.h2.Driver]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:354)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.loadDriverIfPossible(DriverManagerConnectionProviderImpl.java:163)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildCreator(DriverManagerConnectionProviderImpl.java:119)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildPool(DriverManagerConnectionProviderImpl.java:103)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:75)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:100)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:246)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.buildJdbcConnectionAccess(JdbcEnvironmentInitiator.java:145)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
    ... 16 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : org.h2.Driver
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:342)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:351)
    ... 28 more

and here's the code :

休眠Util文件

package config;

import java.util.HashMap;
import java.util.Map;

import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Environment;

import model.entity.Product;

public class HibernateUtil {
       private static StandardServiceRegistry registry;
       private static SessionFactory sessionFactory;

       public static SessionFactory getSessionFactory() {
          if (sessionFactory == null) {
             try {

                // Create registry builder
                StandardServiceRegistryBuilder registryBuilder = new StandardServiceRegistryBuilder();

                // Hibernate settings equivalent to hibernate.cfg.xml's properties
                Map<String, String> settings = new HashMap<String, String>();
                settings.put(Environment.DRIVER, "org.h2.Driver");
                settings.put(Environment.URL, "jdbc:h2:tcp://localhost/~/ShoppingDB");
                settings.put(Environment.USER, "Aziz");
                settings.put(Environment.PASS, "*Aziz007");
                settings.put(Environment.DIALECT, "org.hibernate.dialect.H2Dialect");
                settings.put(Environment.HBM2DDL_AUTO, "update");
                settings.put(Environment.SHOW_SQL, "true");

                // Apply settings
                registryBuilder.applySettings(settings);

                // Create registry
                registry = registryBuilder.build();

                // Create MetadataSources
                MetadataSources sources = new MetadataSources(registry);
                sources.addAnnotatedClass(Product.class);
                // Create Metadata
                Metadata metadata = sources.getMetadataBuilder().build();


                // Create SessionFactory
                sessionFactory = metadata.getSessionFactoryBuilder().build();


             } catch (Exception e) {
                e.printStackTrace();
                if (registry != null) {
                   StandardServiceRegistryBuilder.destroy(registry);
                }
             }
          }
          return sessionFactory;
       }

       public static void shutdown() {
          if (registry != null) {
             StandardServiceRegistryBuilder.destroy(registry);
          }
       }
}

数据库配置文件：

package config;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class DbConfig {

    private Configuration cfg;
    private SessionFactory sf;
    private Session sess;

    public DbConfig()
    {
        cfg = new Configuration();
        sf = cfg.configure("hibernate.cfg.xml").buildSessionFactory();
    }

    public Session getSess()
    {
        sess = sf.openSession();
        return sess;
    }


}

我应该在cfg配置中更改hibernate.cfg.xml，因为我不在这里使用xml文件，而是将其集成到了Util文件中？

Answer 1

来自堆栈跟踪的问题：原因：java.lang.ClassNotFoundException：无法加载请求的类：org.h2.Driver

这被指定为在代码中显式设置的驱动程序设置。

您必须在类路径中提供数据库驱动程序，或指定一个存在的数据库驱动程序。

Answer 2

您应该在类路径中添加H2 jdbc驱动程序jar文件

使用Hibernate时无法修复发生的错误

2 个答案: