Question

我正在努力让hibernate使用Spring Boot。我得到以下例外：

org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; txManager＆＃39;的bean时出错在com.xxx.MegLabApplication中定义：通过工厂方法的Bean实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[org.springframework.orm.hibernate5.HibernateTransactionManager]：工厂方法＆＃39; txManager＆＃39;抛出异常;嵌套异常是org.hibernate.service.UnknownUnwrapTypeException：无法解包到请求的类型[javax.sql.DataSource]

我唯一能找到类似的东西就是缺少c3p0连接池，但是我的gradle构建文件中有c3p0的依赖项，属性被传递给hibernates配置。

有人可以就如何修复此配置提出建议吗？

由于

import java.util.Properties;

import org.apache.tomcat.jdbc.pool.DataSource;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBuilder; 
import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement
@SpringBootApplication
public class MegLabApplication
{

public static void main(String[] args)
{
    SpringApplication.run(MegLabApplication.class, args);
}

@Value("${spring.datasource.driverClassName}")
private String databaseDriverClassName;

@Value("${spring.datasource.url}")
private String datasourceUrl;

@Value("${spring.datasource.username}")
private String databaseUsername;

@Value("${spring.datasource.password}")
private String databasePassword;

@Bean
public SessionFactory sessionFactory()
{
    Configuration configuration = new Configuration();
    configuration.setProperties(getHibernateProperties());

    ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
            .applySettings(configuration.getProperties()).build();

    LocalSessionFactoryBuilder builder = new LocalSessionFactoryBuilder(dataSource());

    builder.scanPackages("com.xxx.models");

    return builder.buildSessionFactory(serviceRegistry);
}

private Properties getHibernateProperties()
{
    Properties prop = new Properties();
    prop.put("hibernate.connection.pool_size", "10");

    prop.put("hibernate.c3p0.min_size", "5");
    prop.put("hibernate.c3p0.max_size", "20");
    prop.put("hibernate.c3p0.timeout", "300");
    prop.put("hibernate.c3p0.max_statements", "50");
    prop.put("hibernate.c3p0.idle_test_period", "60");

    prop.put("hibernate.format_sql", "true");
    prop.put("hibernate.show_sql", "true");
    prop.put("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
    prop.put("hibernate.hbm2ddl.auto", "update");
    return prop;
}

@Bean(name = "dataSource")
public DataSource dataSource()
{
    DataSource ds = new DataSource();
    ds.setDriverClassName(databaseDriverClassName);
    ds.setUrl(datasourceUrl);
    ds.setUsername(databaseUsername);
    ds.setPassword(databasePassword);
    return ds;
}

@Bean
public HibernateTransactionManager txManager()
{
    return new HibernateTransactionManager(sessionFactory());
}
}

Answer 1

好的，所以我终于把这一切都搞定了......

Spring启动使用hibernate 4.3.11。我原始配置中的HibernateTransactionManager类使用的是Hibernate5，因此我将类版本更改为4.我的C3P0依赖项也是版本5，因此我将其降级为4。

我还必须将连接细节添加到hibernate属性，并通过指定类明确告诉它使用C3P0连接提供程序。

prop.put("hibernate.connection.provider_class", "org.hibernate.c3p0.internal.C3P0ConnectionProvider")

希望这可以帮助任何人稍后遇到这个问题，直到Spring启动支持Hibernate 5。

无法解压缩到请求的类型Javax.Sql.Datasource - Spring hibernate java config

1 个答案: