无法在 Hibernate 中创建会话工厂

Question

我正在学习 hibernate 4，但陷入了创建 Session Factory 的困境 请检查我的代码并帮助我找出问题的原因，因为我正在使用 hibernate-core 5.0.6、MySQL 连接器 5.0.8、log4j 1.2.17、jta jar、dom4j 和 jboss-logging jar，这是我的会话工厂代码

class HibernateUtill 
{

    private static final SessionFactory sessionFactory;
        static {
            try {
                Logger logger = Logger.getLogger("Mylogger");
                logger.info("Trying to create a test connection with database");
                Configuration configuration = new Configuration().configure();
                configuration.configure();
                StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(configuration
                        .getProperties());
                sessionFactory = configuration.buildSessionFactory(builder.build());
            } catch (Throwable ex) {
                System.out.println("SessionFactory creation failed with error" + ex);
                throw new ExceptionInInitializerError(ex);
            }

        }

        public static SessionFactory getSessionFactory() {
            return sessionFactory;

        }

        public static void shutDown() {
            sessionFactory.close();
        }
}

我得到的错误是：

 log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
SessionFactory creation failed with errororg.hibernate.internal.util.config.ConfigurationException: Could not locate cfg.xml resource [hibernate.cfg.xml]
Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.commonClasses.HibernateUtil.<clinit>(HibernateUtil.java:19)
    at com.java.save.SavingObject.savingObject(SavingObject.java:13)
    at com.java.save.SavingObject.main(SavingObject.java:31)
Caused by: org.hibernate.internal.util.config.ConfigurationException: Could not locate cfg.xml resource [hibernate.cfg.xml]
    at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:53)
    at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:259)
    at com.commonClasses.HibernateUtil.<clinit>(HibernateUtil.java:12)
    ... 2 more

或者简单来说errororg.hibernate.internal.util.config.ConfigurationException：找不到cfg.xml资源

我知道错误是由于 log4j 而我将 log4j.properties 放在 src 文件夹中，属性文件的代码是

# Root logger option
log4j.rootlogger=INFO,stdout

#Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

#log JDBC bind parameter runtime arguments
log4j.logger.org.hibernate.type=trace

请帮我解决这个错误以及这个错误的原因。 任何帮助表示赞赏， 谢谢。

Answer 1

试试这个。

Configuration configuration = new Configuration().configure(HibernateUtil.class.getResource("/hibernate.cfg.xml"));
StandardServiceRegistryBuilder serviceRegistryBuilder = new StandardServiceRegistryBuilder();
serviceRegistryBuilder.applySettings(configuration.getProperties());
ServiceRegistry serviceRegistry = serviceRegistryBuilder.build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);

Answer 2

你需要创建一个 hibernate.cfg.xml 像：

 <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration>   <session-factory>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/yourDB</property>
    <property name="hibernate.connection.characterEncoding">UTF-8</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
     <property name="hibernate.current_session_context_class">thread</property>
        <property name="hibernate.connection.CharSet">utf8</property>
        <property name="hibernate.connection.characterEncoding">utf8</property>
        <property name="hibernate.connection.useUnicode">true</property>

      <!-- DB schema will be updated if needed -->
    <!-- <property name="hbm2ddl.auto">update</property> -->   </session-factory> </hibernate-configuration>

将下一个代码添加到您的 servlet.xml

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${database.driver}" />
    <property name="url" value="${database.url}" />
    <property name="username" value="${database.user}" />
    <property name="password" value="${database.password}" />
</bean>
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation" value="classpath:hibernate.cfg.xml" />
</bean>

并使用下一个代码创建 .properties 文件

database.driver=com.mysql.jdbc.Driver
database.url=jdbc:mysql://localhost:3306/yourDB
database.user=user
database.password=password
hibernate.show_sql=true

之后，您可以使用下一个代码创建休眠会话

Session session = null;
    session = sessionFactory.openSession();
    String query = "select users.username, users.password, users.name, users.enabled, users.surname, users.email, users.gender, users.age, users.weight, users.height, users.sport, users.place, users.photo from users where users.username LIKE '%s'";
    List<Users> userInfoList = session.createSQLQuery(String.format(query, username)).addEntity(Users.class).list();
    session.close();
    session = null;

Answer 3

您的类路径中缺少休眠配置文件。这可以命名为广告cfg.xml。下面是配置文件的示例。为您的数据库配置这些元素并将其放置在类路径中。

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://${OPENSHIFT_MYSQL_DB_HOST}:3306/hibernatetrial?createDatabaseIfNotExist=true</property>
        <property name="hibernate.connection.username">username</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">false</property>
        <property name="format_sql">true</property>
        <property name="hbm2ddl.auto">update </property>
        <mapping resource="hibernatemapping/mapping.xml"/>

    </session-factory>
</hibernate-configuration>