org.hibernate.HibernateException：如果没有活动事务，get无效 [英] org.hibernate.HibernateException: get is not valid without active transaction

问题描述

我是Hibernate的新手。

• 自动创建hibernate.cfg.xml（Netbeans向导）
  
• 自动创建HibernateUtil.java


• 自动创建带注释的POJO类

Trying从数据库中获取对象但收到错误：

 线程pool-1-thread-1中的异常org.hibernate.HibernateException ：get没有活动事务是有效的
在org.hibernate.context.ThreadLocalSessionContext $ TransactionProtectionWrapper.invoke（ThreadLocalSessionContext.java:297）
  

获取对象：

 会话会话= HibernateUtil.getSessionFactory（）。getCurrentSession（） ; 
 CallInfo ci =（CallInfo）session.get（CallInfo.class，ucid）; 
  

hibernate.cfg.xml

 < 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：3306 / sochi_feedback< / property> 
< property name =hibernate.connection.username>根< / property> 
< property name =hibernate.connection.password>根< / property> 
< property name =hibernate.show_sql> true< / property> 
< property name =hibernate.query.factory_class> org.hibernate.hql.classic.ClassicQueryTranslatorFactory< / property> 
< property name =hibernate.current_session_context_class>线程< / property> 
  

解决方案

添加

Transaction tx = session.beginTransaction（）; //此语句将启动交易

就在你的 CallInfo ci =（CallInfo）session.get（CallInfo.class，ucid）;

您的交易结束通过调用提交更改。

  tx.commit（）; 
  

I'm new to Hibernate.

• Automatically created hibernate.cfg.xml (Netbeans wizard)
• Automatically created HibernateUtil.java
• Automatically created POJO class with annotations

Trying to get object from database but getting error:

Exception in thread "pool-1-thread-1" org.hibernate.HibernateException: get is not valid without active transaction
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:297)

getting an object:

Session session = HibernateUtil.getSessionFactory().getCurrentSession();
CallInfo ci = (CallInfo) session.get(CallInfo.class, ucid);

hibernate.cfg.xml

<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:3306/sochi_feedback</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="hibernate.current_session_context_class">thread</property>

解决方案

Add

Transaction tx = session.beginTransaction(); //This statement will initiate the transaction

just before your CallInfo ci = (CallInfo) session.get(CallInfo.class, ucid);

and at the end of your transaction commit the changes by calling..

tx.commit();

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