org.hibernate.HibernateException: get is not valid without active transaction

问题

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>

回答1:

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();

回答2:

Another solution is to use openSession() instead of getCurrentSession(). Then transactions can be used only when required for updating queries.

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

回答3:

Even after beginTransaction() and and commit() if you still get the

Caused by: org.hibernate.HibernateException: setDefaultReadOnly is not valid without active transaction
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)

go to "Start" and search for services and restart the database service

回答4:

Before you actually start the transaction you need to start the session by calling session.beginTransaction(), right after you create sessionFactory.

来源：https://stackoverflow.com/questions/9717906/org-hibernate-hibernateexception-get-is-not-valid-without-active-transaction

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