Java Linux操作系统中Tomcat服务器的Hibernate连接问题

您好，我正在使用Linux操作系统和Fedora 17版，我的Hibernate配置文件如下

<hibernate-configuration>


   <session-factory>
   <property name="hibernate.dialect">
      org.hibernate.dialect.MySQLDialect
   </property>
   <property name="hibernate.connection.driver_class">
      com.mysql.jdbc.Driver
   </property>

   <!-- Assume test is the database name -->
   <property name="hibernate.connection.url">
      jdbc:mysql://localhost:3306/Test
   </property>
   <property name="hibernate.connection.username">
      root
   </property>
   <property name="hibernate.connection.password">
      root
   </property>

<property name="show_sql">false</property>
<property name="format_sql">false</property>
<property name="use_sql_comments">false</property>
   <property name="hibernate.connection.pool_size">40</property>  

    <property name="hibernate.c3p0.min_size">1</property>
    <property name="hibernate.c3p0.max_size">20</property>
    <property name="hibernate.c3p0.timeout">300</property>
    <property name="hibernate.c3p0.max_statements">50</property>
    <property name="hibernate.c3p0.idle_test_periods">3000</property>     
    <property name="current_session_context_class">thread</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="hibernate.c3p0.acquire_increment">1</property>

</hibernate-configuration>


   </session-factory>

我的连接代码如下：

public class DBConnection{

    private static  SessionFactory factory; 

    private static DBConnection singleton = new DBConnection();

    // private static final SessionFactory sessionFactory;
    private DBConnection(){ }

    /* Static 'instance' method */
    public static DBConnection getInstance( ) {
       return singleton;
    }

    public static SessionFactory getSessionFactory(){

         if (factory == null ) {

             try {
                 factory = new Configuration().configure().buildSessionFactory();

               } catch (Throwable ex) {
                 System.err.println("Failed to create   sessionFactory object." + ex);
                 throw new ExceptionInInitializerError(ex);
             }
         }
         return factory;

     }


    public static Session getSession() 
    {
           return getSessionFactory().openSession();
    }



   // Call this during shutdown
  public static void close() {
        factory.close();
        factory=null;


   }

由于这个原因，我的应用程序速度变慢了，我可以在MySQL中看到睡眠查询

如何解决这个问题？如何在此环境中进行配置？非常感谢您的帮助

---

谢谢

会话对象在Hibernate中不是线程安全的。除非同步会话，否则是否跨多个线程使用同一会话objects@KeerthiRamanathan感谢您的回复-我在应用程序中跨多个线程使用同一会话。在这个环境中该怎么做？我可以问你为什么要这样做吗？在我的应用程序中，我对来自web应用程序的每个请求使用单独的会话创建，并且在函数本身的每个请求之后关闭它，session session=null；尝试{session=new DBConnection（）.getSession（）；tx=session.beginTransaction（）；tx.commit（）；session.close（）；DBConnection.close（）；}catch（异常示例）{if（tx！=null）tx.rollback（）；session.close（）；DBConnection.close（）；ex.printStackTrace（）；}请查找上面的代码。如果你需要，我会给你额外的信息

public class DBConnection{

    private static  SessionFactory factory; 

    private static DBConnection singleton = new DBConnection();

    // private static final SessionFactory sessionFactory;
    private DBConnection(){ }

    /* Static 'instance' method */
    public static DBConnection getInstance( ) {
       return singleton;
    }

    public static SessionFactory getSessionFactory(){

         if (factory == null ) {

             try {
                 factory = new Configuration().configure().buildSessionFactory();

               } catch (Throwable ex) {
                 System.err.println("Failed to create   sessionFactory object." + ex);
                 throw new ExceptionInInitializerError(ex);
             }
         }
         return factory;

     }


    public static Session getSession() 
    {
           return getSessionFactory().openSession();
    }



   // Call this during shutdown
  public static void close() {
        factory.close();
        factory=null;


   }