Hibernate : No CurrentSessionContext configured

Question

I'm stuck due to some silly mistake somewhere but not able to figure out !

Hibernate 4.2.6

I have referred to this question, asked several times previously, for example here

hibernate.cfg.xml

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

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.bytecode.use_reflection_optimizer">false</property>

        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="hibernate.connection.username">root</property>

        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <property name="show_sql">true</property>

        <property name="hibernate.current_session_context_class">org.hibernate.context.ThreadLocalSessionContext</property>

        <mapping resource="Event.hbm.xml"></mapping>
    </session-factory>
</hibernate-configuration>

Event.hbm.xml

<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="com.db.pojo.Event" table="Events">

        <id name="id" column="Id">
            <generator class="native"></generator>
        </id>
        <property name="title" column="Title"></property>

        <property name="date" column="Date" type="timestamp"></property>

    </class>

</hibernate-mapping>

HibernateUtil

package com.db.util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        // TODO Auto-generated method stub

        Configuration configuration = new Configuration();
        configuration.configure("hibernate.cfg.xml");

        ServiceRegistryBuilder serviceRegistryBuilder = new ServiceRegistryBuilder()
                .applySettings(configuration.getProperties());
        return configuration.buildSessionFactory(serviceRegistryBuilder
                .buildServiceRegistry());
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}

Whenever I try this :

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

I get :

Exception in thread "main" org.hibernate.HibernateException: No CurrentSessionContext configured!
    at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:988)
    at test.EventManager.createAndStoreEvent(EventManager.java:27)
    at test.EventManager.main(EventManager.java:17)

Edited after executing on my personal laptop

1. The code runs fine if I use 'thread' in the cfg file
2. If I use 'ThreadLocalSessionContext', I get the below exception(Please note that even the output on the console is now enormous than the previous run) - is it that the class 'ThreadLocalSessionContext' was not present in the 3.0 version(I tried to find in the API but the site doesn't have the older API )

Now I'm suspicious about the dtd - are Hibernate 3.0 jars being referred somewhere while the local ones are ignored, even though SYSTEM is specified? I got the previous exception(no current context) while executing the code on a machine with restricted Internet access. But when I executed the same on my personal laptop :

eventDesciption : Team eventDate : 2013-12-12
Nov 28, 2013 8:55:59 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
Nov 28, 2013 8:55:59 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.2.6.Final}
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: hibernate.cfg.xml
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: hibernate.cfg.xml
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Configuration addResource
INFO: HHH000221: Reading mappings from resource: resources/Event.hbm.xml
Nov 28, 2013 8:55:59 PM org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Nov 28, 2013 8:55:59 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Nov 28, 2013 8:55:59 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 20
Nov 28, 2013 8:55:59 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: false
Nov 28, 2013 8:55:59 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/test]
Nov 28, 2013 8:55:59 PM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=root, password=****}
Nov 28, 2013 8:56:00 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Nov 28, 2013 8:56:00 PM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation
INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
Nov 28, 2013 8:56:00 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
Nov 28, 2013 8:56:00 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Nov 28, 2013 8:56:00 PM org.hibernate.internal.SessionFactoryImpl buildCurrentSessionContext
ERROR: HHH000302: Unable to construct current session context [org.hibernate.context.ThreadLocalSessionContext]
org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [org.hibernate.context.ThreadLocalSessionContext]
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:152)
    at org.hibernate.internal.SessionFactoryImpl.buildCurrentSessionContext(SessionFactoryImpl.java:1544)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:516)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
    at com.db.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:19)
    at com.db.util.HibernateUtil.<clinit>(HibernateUtil.java:9)
    at test.EventManager.createAndStoreEvent(EventManager.java:27)
    at test.EventManager.main(EventManager.java:17)
Caused by: java.lang.ClassNotFoundException: Could not load requested class : org.hibernate.context.ThreadLocalSessionContext
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:319)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:149)
    ... 7 more

Exception in thread "main" org.hibernate.HibernateException: No CurrentSessionContext configured!
    at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:988)
    at test.EventManager.createAndStoreEvent(EventManager.java:27)
    at test.EventManager.main(EventManager.java:17)

Answer 1

When you write

Session session = HibernateUtil.getCurrentSession();

What you are trying to do here is that you are trying to get a session. You can compare this to normal jdbc mysql code where you first create a Connection conn and then you use that conn to create query.

What if you never initialized the Connection conn variable.

The above code is doing that thing.

So to avoid this exception, all you need to do is first open a session using below code.

Session session = HibernateUtil.openSession();

Once you have used the above piece of code then you can use.

Session session = HibernateUtil.getCurrentSession();

NOTE:- Avoid using getSessionFactory() as mentioned in some answers since its a depricated method.

Answer 2

try changing

Session session = HibernateUtil.getSessionFactory().getCurrentSession();

to :

Session session = HibernateUtil.getSessionFactory().openSession();

Answer 3

For hibernate 4.x you need to use org.hibernate.context.internal.ThreadLocalSessionContext instead of org.hibernate.context.ThreadLocalSessionContext .

However, you can just set the property to thread and not Thread .

<property name="hibernate.current_session_context_class">thread</property>

Answer 4

I know this is an old post but just in case someone comes here as I did - this is working:

package com.spring.util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

private static HibernateUtil instance = new HibernateUtil();

private SessionFactory sessionFactory;

private HibernateUtil(){
    this.sessionFactory = buildSessionFactory();
}

private synchronized static SessionFactory buildSessionFactory() {
    return new Configuration().configure().buildSessionFactory();
}

public static HibernateUtil getInstance() {
    if(instance == null){
        return new HibernateUtil();
    }
    return instance;
}

public SessionFactory getSessionFactory() {
    return sessionFactory;
}

}

Now to invoke this is quite simple:

SessionFactory sessionFactory = HibernateUtil.getInstance().getSessionFactory();

And the next step would be something like bellow:

public void saveOrUpdate(MyObject myObj) {
    Session session = sessionFactory.getCurrentSession();
    session.beginTransaction();
    session.saveOrUpdate(myObj);
    session.getTransaction().commit();
}

Also make sure that hibernate.cfg.xml is in src/main/resources folder.

Answer 5

You need to change your property:

org.hibernate.context.internal.ThreadLocalSessionContext to Thread

Answer 6

As per the best of my knowledge, your configuration is not proper for current session. Instead of

<property name="hibernate.current_session_context_class">org.hibernate.context.ThreadLocal‌​SessionContext</property>

use

<property name="hibernate.current_session_context_class">thread</property>

For more information on this, please visit this link:

http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/architecture.html#architecture-current-session

Specially, read the last lines of last paragraph.

For those who're using Hibernate 4.1,

<property name="hibernate.current_session_context_class">org.hibernate.context.internal.ThreadLocalSessionContext</property>

Reference: https://docs.jboss.org/hibernate/orm/4.1/javadocs/org/hibernate/context/internal/ThreadLocalSessionContext.html

Answer 7

Try changing

Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 

to :

Session session = HibernateUtil.getSessionFactory().openSession();