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How to run standalone Hibernate 4 SchemaExport with Java Spring config

We have a Java Spring project using JPA with Hibernate 4 for ORM. We exclusively use Java config, so we don't have any hibernate.properties or persistence.xml mapping files.
We're also using Spring's Jsr310JpaConverters and some custom attribute converters implementing javax.persistence.AttributeConverter. The custom converters are picked up automatically by the package scan.
Other than that, our setup is fairly standard, basically just
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(basePackageClasses = BasePackageMarker.class, repositoryBaseClass = InternalRepositoryImpl.class)
public class JpaConfig {
// values loaded from property file
public Properties jpaProperties() {
Properties jpaProperties = new Properties();
jpaProperties.setProperty(Environment.DIALECT, dialect);
jpaProperties.setProperty(Environment.HBM2DDL_AUTO, getHbm2ddlAuto());
// ...
return jpaProperties;
}
#Bean
public DataSource dataSource() {
HikariConfig config = new HikariConfig();
config.setDriverClassName(driver);
config.setJdbcUrl(url);
config.setUsername(username);
config.setPassword(password);
// ...
return new HikariDataSource(config);
}
#Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource);
entityManagerFactoryBean.setPackagesToScan(
BasePackageMarker.class.getPackage().getName(),
Jsr310JpaConverters.class.getPackage().getName()
);
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setJpaProperties(jpaProperties());
return entityManagerFactoryBean;
}
// ...
}
I'm looking for a way to run Hibernate's SchemaExport to create our database schema, without running Tomcat or the Spring application, with the same configuration as starting the application with hbm2ddl=create, specifically finding all entity classes and attribute converters. I'd like to run it with Maven, but I can figure that part out once I know where to start.
I've found many outdated answers and libraries for Hibernate 3 or for XML config, nothing seems to work for our setup. I'm sure the answer is already out there, but at this point I'm quite confused and don't know what to try. Any solutions or pointers?

I think what you need go with AnnotationConfiguration():
In hibernate, database connection can also be achieved without using hibernate.cfg.xml. In hibernate annotation, there is a class named as AnnotationConfiguration. AnnotationConfiguration provides the method to configure database properties.
There are different methods of AnnotationConfiguration like .addAnnotatedClass, .addProperties etc. There is .configure() methods which seeks hibernate.cfg, We need not to use .configure() if we are not intended to use hibernate.cfg.
suppose I have entity User
package com.persistence;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="user")
public class User {
#Id
#GeneratedValue
private int id;
#Column(name="name")
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
HibernateUtil class
public class HibernateUtil {
private static final SessionFactory concreteSessionFactory;
static {
try {
Properties prop= new Properties();
prop.setProperty("hibernate.connection.url", "jdbc:mysql://localhost:3306/hibernate");
prop.setProperty("hibernate.connection.username", "root");
prop.setProperty("hibernate.connection.password", "");
prop.setProperty("dialect", "org.hibernate.dialect.MySQLDialect");
prop.setProperty("hbm2ddl.auto", "create");
concreteSessionFactory = new AnnotationConfiguration()
.addPackage("com.persistence")
.addProperties(prop)
.addAnnotatedClass(User.class)
.buildSessionFactory();
} catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static Session getSession()
throws HibernateException {
return concreteSessionFactory.openSession();
}
public static void main(String... args){
Session session=getSession();
session.beginTransaction();
User user=(User)session.get(User.class, new Integer(1));
System.out.println(user.getName());
session.close();
}
}

Here's my solution based on Bhushan Uniyal's answer. Using reflection to find our entities and attribute converters.
public static void main(String... args) {
Properties prop = new Properties();
prop.setProperty("hibernate.connection.url", "jdbc:mysql://127.0.0.1:3306/db");
prop.setProperty("hibernate.connection.username", "user");
prop.setProperty("hibernate.connection.password", "xxxx");
prop.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
prop.setProperty("hibernate.hbm2ddl.auto", "create");
Configuration cfg = new Configuration()
.addPackage("com.persistence")
.addProperties(prop);
Reflections basePackageReflections = new Reflections(BasePackageMarker.class.getPackage().getName());
for (Class<?> entityClass : basePackageReflections.getTypesAnnotatedWith(Entity.class)) {
System.out.println("Adding entity class: " + entityClass.getSimpleName());
cfg.addAnnotatedClass(entityClass);
}
for (Class<? extends AttributeConverter> attributeConverter : basePackageReflections.getSubTypesOf(AttributeConverter.class)) {
System.out.println("Adding attribute converter: " + attributeConverter.getSimpleName());
cfg.addAttributeConverter(attributeConverter);
}
cfg.addAttributeConverter(Jsr310JpaConverters.LocalDateConverter.class);
cfg.addAttributeConverter(Jsr310JpaConverters.LocalDateTimeConverter.class);
cfg.addAttributeConverter(Jsr310JpaConverters.LocalTimeConverter.class);
cfg.addAttributeConverter(Jsr310JpaConverters.InstantConverter.class);
new SchemaExport(cfg).create(true, true);
}

java.lang.NoSuchFieldError: namingStrategy

There's an example from the web on how to use annotations in Hibernate (before that I've worked on the same example, but it used .xml instead. And I've managed to make it work without exceptions).
So now I have:
Initial session factory creation failedjava.lang.NoSuchFieldError: namingStrategy
Exception in thread "main" java.lang.ExceptionInInitializerError
at firstproject.HibernateUtil.<clinit>(HibernateUtil.java:14)
at firstproject.StudentDAO.addSubject(StudentDAO.java:82)
at firstproject.Test.main(Test.java:12) Caused by: java.lang.NoSuchFieldError: namingStrategy
at org.hibernate.cfg.AnnotationConfiguration.reset(AnnotationConfiguration.java:250)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:125)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:119)
at org.hibernate.cfg.AnnotationConfiguration.<init>(AnnotationConfiguration.java:108)
at firstproject.HibernateUtil.<clinit>(HibernateUtil.java:11)
... 2 more
Here is some code, that may help:
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); // HibernateUtil.java:11
} catch (Throwable ex) {
System.err.println("Initial session factory creation failed" + ex);
throw new ExceptionInInitializerError(ex); // HibernateUtil.java:14
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
public class StudentDAO {
public Long addSubject(Subject subject) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession(); // StudentDAO.java:82
session.beginTransaction();
Long result = (Long) session.save(subject);
session.getTransaction().commit();
return result;
}
}
public class Test {
public static void main(String[] args) {
StudentDAO dao = new StudentDAO();
Subject subject = new Subject();
subject.setSubjectName("Mathematics");
dao.addSubject(subject); // Test.java:12
}
}

Hi Kleeo
You have written the following line in HibernateUtil class.
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
Replace this line of code with the below written line & retry. I hope this will work for you.
sessionFactory = new Configuration().configure().buildSessionFactory();

AnnotationConfiguration has been Deprecated in Hibernate 3.6.
As you can see in the documentation (see link below) all functionality has been moved to Configuration.
You can use safely Configuration instead.
sessionFactory = new Configuration().configure().buildSessionFactory();
AnnotationConfiguration documentation:
http://docs.jboss.org/hibernate/core/3.6/javadocs/org/hibernate/cfg/AnnotationConfiguration.html

Use below :
sessionFactory = new Configuration().configure().buildSessionFactory();
And also ensure that your cfg.xml should be present in root of src folder. Else you will get exception of unable to find cfg file

Hibernate 5 :- org.hibernate.MappingException: Unknown entity

I am getting the error message org.hibernate.MappingException: Unknown entity when i am trying to integrate hibernate 5.0 with mysql
This seems to be an issue with hibernate5.0.0 and 5.0.1 . This works fine with hibernate 4.3.9
Maven dependices
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.0.0.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
hibernate.cfg.xml
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3307/SampleDB
</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">create</property>
<mapping class="UserA.User"></mapping>
</session-factory>
HibernateMain.java code
package UserA;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.mapping.Map;
import org.hibernate.metadata.ClassMetadata;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.service.ServiceRegistry;
public class HibernateMain {
public static void main(String[] args) {
Configuration configuration = new Configuration();
configuration.configure();
ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
SessionFactory sf = configuration.buildSessionFactory(sr);
User user1 = new User();
user1.setUserName("Arpit");
user1.setUserMessage("Hello world from arpit");
user1.setUserId(22);
Session ss = sf.openSession();
ss.beginTransaction();
// saving objects to session
ss.save(user1);
ss.getTransaction().commit();
ss.close();
}
}
User.java
package UserA;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
#Entity(name="User_table")
public class User {
#Id
int userId;
#Column(name = "User_Name")
String userName;
#Column(name = "User_Message")
String userMessage;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserMessage() {
return userMessage;
}
public void setUserMessage(String userMessage) {
this.userMessage = userMessage;
}
}

I have fixed the same issue with Hibernate 5. There is a problem in this code
Configuration configuration = new Configuration();
configuration.configure();
ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
SessionFactory sf = configuration.buildSessionFactory(sr);
This code works fine for Hibernate 4.3.5, but the same code has the same issue for Hibernate 5.
When you do configuration.buildSessionFactory(sr), using Hibernate 5, Configuration losts all information about mapping that gets by call configuration.configure().
Solution
To fix the issue, if you use standard configuration files hibernate.cfg.xml and hibernate.properties, you can create the session factory by this way (without ServiceRegistry)
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Loading properties
If you have properties in a file other then hibernate.properties, you can build session factory using StandardServiceRegistryBuilder (anyway, if you have hibernate.properties and other file, it will be loaded both)
To load properties as a resource
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().
configure().loadProperties("hibernate-h2.properties").build();
SessionFactory sf = new Configuration().buildSessionFactory(serviceRegistry);
You need to have hibernate-h2.properties in the class path (root of the sources folder, resources folder). You can specify a path from the root source folder too
/com/github/xxx/model/hibernate-h2.properties.
To load properties from a path in the file system
File propertiesPath = new File("some_path");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().
configure().loadProperties(propertiesPath).build();
SessionFactory sf = new Configuration().buildSessionFactory(serviceRegistry);
You can find an example console application using this approach here fluent-hibernate-mysql. It uses a utility class to build the session factory from the fluent-hibernate library.
Incorrect Hibernate 5 tutorial
There is an incorrect example in Hibernate 5 tutorial 1.1.6. Startup and helpers. It uses this code
return new Configuration().configure().buildSessionFactory(
new StandardServiceRegistryBuilder().build() );
It doesn't do a proper configuration.

In Hibernate 5, you need to build StandardServiceRegistry and Metadata to build SessionFactory. You could use the following HibernateUtil to build SessionFactory. hibernate.cfg.xml should be in the root of the classpath of your application.
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder() .configure("hibernate.cfg.xml").build();
Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().build();
return metadata.getSessionFactoryBuilder().build();
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Also, If you're using Hibernate 5 and using #Id as your identifier generation strategy then using GenerationType.AUTO will pick up the "sequence" identity generator by default with MySQL, which will give you an the com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'SampleDB.hibernate_sequence' doesn't exist exception, if you don't have it configured in your entities at identifier attributes. So with Hibernate 5, use GenerationType.IDENTITY instead.

You didn't add a configuration file
configuration.configure("/hibernate.cfg.xml");

Please make sure that you have created mapping file User.hbm.xml or User.xml file and included that file in hibernate.cfg.xml

Using this:
SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
Session session = sessionFactory.openSession();
instead of this:
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
solved the issue with Hibernate 5.2.10.Final.

I was facing the same issue & I searched for almost 2 hours and tried with different possible ways like replacing old hibernate jars&changing the db table schema. But finally got the solution as below;
//This line to be replaced with below commented line
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Replace above for
Configuration config = new Configuration().configure();
ServiceRegistry servReg = new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
SessionFactory factory = config.buildSessionFactory(servReg);
It will then work fine..

Hibernate package scan in JavaConfig

I'm trying to configure Spring and Hibernate without xml. Here's my SessionFactory bean. When I add annotated class to configuration - it works properly. I want to do it automatically, but adding a package to configuration doesnt helps for some reason, I get "Identificator is not mapped" error
#Bean
public SessionFactory sessionFactory(){
Properties hibernateProperties = new Properties();
hibernateProperties.put("hibernate.connection.driver_class",ds_driver);
hibernateProperties.put("hibernate.connection.url",ds_url);
hibernateProperties.put("hibernate.connection.username",ds_username);
hibernateProperties.put("hibernate.connection.password",ds_password);
hibernateProperties.put("hibernate.show_sql", false);
hibernateProperties.put("connection.pool_size", 1);
hibernateProperties.put("current_session_context_class", "thread");
hibernateProperties.put("hibernate.hbm2ddl.auto", "update");
org.hibernate.cfg.Configuration configuration = new org.hibernate.cfg.Configuration();
configuration.addPackage("app.entity"); // **doesnt work**
configuration.addAnnotatedClass(Identificator.class); // **works fine**
configuration.addProperties(hibernateProperties);
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
}

The #addPackage() method reads the package-level metadata, and not the classes in the package. Unfortunately the Configuration class does not provide methods the achive what you want, you have to pass all classes to #addAnnotatedClass().
A possible (but not sure if recommendable) solution would be using another solution to find the required class descriptors, build a list from them, and then pass them in a loop to #addAnnotatedClass(). I am quite sure, that Spring has solutions for this.

public SessionFactory getSessionFactory() {
if (sessionFactory == null) {
Configuration configuration = new Configuration()
.configure(getMappedValue("Universal", "qb_hibernate"))
.setProperty("hibernate.connection.autocommit", "true")
.setProperty("connection.pool_size", "20000")
.setProperty("hibernate.dialect", getMappedValue("Universal", "dialect"))
.setProperty("hibernate.connection.driver_class", getMappedValue("Universal", "driver_class"))
.setProperty("hibernate.connection.url", getMappedValue("Universal", "url"))
.setProperty("hibernate.connection.username", getMappedValue("Universal", "userName"))
.setProperty("hibernate.connection.password", getMappedValue("Universal", "password"))
.setProperty("hibernate.show_sql", "false")
.setProperty("hibernate.current_session_context_class", "thread")
.setProperty("hibernate.query.factory_class", "org.hibernate.hql.internal.classic.ClassicQueryTranslatorFactory");
ServiceRegistry serviceRegistry
= new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
LocalSessionFactoryBuilder builder
= new LocalSessionFactoryBuilder(dataSource());
builder.scanPackages("zw.co.techno.xxxxx.model").buildSettings(serviceRegistry);
// builds a session factory from the service registry
// sessionFactory = configuration.buildSessionFactory(serviceRegistry);
sessionFactory = builder.buildSessionFactory();
}
return sessionFactory;
}

hibernate-can't run " cfg.configure()" outside of method?

due to the frequently insert event , (it's a chat room program)
it's always occurs "exception : java heap outOfMemory...."
and i think that it's cause from here
here is my correct code
public static boolean saveMethod(String userid,String username,String msg){
Configuration cfg = new Configuration();
cfg.configure(); //here is correct
SessionFactory factory = cfg.buildSessionFactory();
Session session = factory.openSession();
Transaction tx = null;
tx = session.beginTransaction();
Transaction transaction = null;
try{
....jump
transaction = session.beginTransaction();
session.save(saveMsg);
transaction.commit();
return true;
}catch(Exception e){
return false;
}
}
so i change the method to that
Configuration cfg = new Configuration();
cfg.configure();// error here
SessionFactory factory = cfg.buildSessionFactory();
Session session = factory.openSession();
Transaction tx = null;
tx = session.beginTransaction();
Transaction transaction = null;
public static boolean setPublicMsg(String userid,String username,String msg){
//insert
}
Syntax error on token "configure", Identifier expected after this
token
how can i write here ?
or anyone have some idea about the "exception : java heap outOfMemory...." in hibernate?
i'm try to change the tomcat setting, but it's not working
thanks !

Just by looking at your saveMethod(), it looks like you are creating configuration and sessionFactory per each save call. You can simply avoid this.
When your application starts, you can build the sessionFactory once and reuse as much as you need.
For example, you can use a HibernateUtil class to get the sessionFactory as below.
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static SessionFactory sessionFactory;
public static SessionFactory getSessionFactory() {
if (sessionFactory == null ) {
sessionFactory = new Configuration().configure().buildSessionFactory();
}
return sessionFactory;
}
}
Then in your saveMethod() you get the sessionFactory as below.
public static boolean saveMethod(String userid,String username,String msg){
SessionFactory factory = HibernateUtil.getSessionFactory();
// ...
}