Hibernate does not create any tables:
I got a Tomcat server where my jsf/hibernate project runs on. The database server is a MySQL server. Starts without problems but does not create any tables.
I made a new project without the Tomcat server and any other stuff. Only the Hibernate related code. Still no errors and warnings, but also no tables created.
Hibernate config (hibernate.cfg.xml):
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:mysql://localhost:3306/3bt_database</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="hbm2ddl.auto">create</property>
<mapping class="model.Testtable"/>
</session-factory>
</hibernate-configuration>
HibernateUtil:
public class HibernateUtil {
private static final SessionFactory sessionfactory = buildSessionFactory();
public static SessionFactory buildSessionFactory() throws HibernateException {
try {
Configuration configuration = new Configuration();
configuration.configure();
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
return configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionfactory(){
return sessionfactory;
}
}
StartStopListener:
#WebListener
public class StartStopListener implements ServletContextListener {
#Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
HibernateUtil.getSessionfactory().openSession();
}
#Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
HibernateUtil.getSessionfactory().close();
}
}
Testtable:
#Entity
#Table(name="tblTest")
public class Testtable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int testID;
private String testname;
}
Please do not tell me to create them manually. This is not the answer I am looking for.
try to prepend hibernate. in every propery name
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/3bt_database</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping class="model.Testtable"/>
</session-factory>
</hibernate-configuration>
Update :-
Provide one more property. try at beginning ..
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
//or try with
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
(Posted on behalf of the OP).
I solved the problem. The mapping setting in the XML was no working properly. This link helped me out very much.
Related
I am learning Hibernate and I dont understand why am I getting this error launching program:
java.lang.IllegalStateException: Cannot get a connection as the driver manager is not properly initialized at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:172)
at net.codejava.hibernate.VueloManager.setup(VueloManager.java:15)
at net.codejava.hibernate.VueloManager.main(VueloManager.java:54)
hibernate.cfg.xml file :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property
name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property
name="connection.url">jdbc:mysql://127.0.0.1:3306/vuelos_lite</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping class="net.codejava.hibernate.Vuelo" />
<mapping class="net.codejava.hibernate.Pasajero" />
<mapping class="net.codejava.hibernate.Pasaje" />
</session-factory>
</hibernate-configuration>
VueloManager class. This is the main class of the program:
public class VueloManager {
protected SessionFactory sessionFactory;
protected void setup() {
final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
try {
sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
} catch (Exception ex) {
StandardServiceRegistryBuilder.destroy(registry);
}
}
protected void read() {
Session session = sessionFactory.openSession();
String identificadorId = "BRU-2222";
Vuelo vuelo = session.get(Vuelo.class, identificadorId);
System.out.println("Id: " + vuelo.getIdentificador());
System.out.println("Fecha: " + vuelo.getDate());
System.out.println("Tipo Vuelo: " + vuelo.getTipo_vuelo());
exit();
}
public static void main(String[] args) {
VueloManager manager = new VueloManager();
manager.setup();
//manager.read();
manager.exit();
}
}
I have checked hibernate.cfg.xml connections and all is fine.
I have created a maven project with hibernate 5.4 and successfully created DAOs now when I try to get Hibernate Session via getSessionFactory().getCurrentSession() I get Exception org.hibernate.HibernateException: No CurrentSessionContext configured! although I have already added
<property name="hibernate.current_session_context_class">thread</property> in hibernate.cfg.xml file. Already checked several forums including this question org.hibernate.HibernateException: No CurrentSessionContext configured but unable to solve it,
Here is the hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//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">onetozero</property>
<property name="hibernate.connection.url">jdbc:mysql://192.168.0.112:3306/ecdis</property>
<property name="hibernate.connection.username">root1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL8Dialect</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.current_session_context_class">thread</property>
<mapping class="Domain.Route"/>
<mapping class="Domain.RoutePoint"/>
</session-factory>
</hibernate-configuration>
HibernateSession Class
public class HibernateSession {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new Configuration().configure().buildSessionFactory();
} 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;
}
public static void shutdown() {
// Close caches and connection pools
getSessionFactory().close();
}
}
and this is how I am using getting the List via DAO
public List<T> list() {
Session session = HibernateSession.getSessionFactory().getCurrentSession();
CriteriaQuery<T> query = session.getCriteriaBuilder().createQuery(entityClass);
query.select(query.from(entityClass));
return session.createQuery(query).getResultList();
}
I am new new to Java and Hibernate, also not using any framework atm so a little detail can also go along the way. TIA
Use HibernateSession.getSessionFactory().openSession() rather than getCurrentSession() to get session, then session factory will bind session to current context as you are using current session context class thread not JTA.Details here
Maybe it is a simple question, but I can't find out this situation of relations in Hibernate.
I have these Entities:
#Entity
public class User {
...
#OneToMany(mappedBy = "user")
private Set<Conversation> posts = new HashSet<Conversation>();
...
}
#Entity
public class Conversation {
...
#OneToMany(mappedBy = "conversation")
private Set<Message> messages = new HashSet<Message>();
...
}
#Entity
public class Message { ... }
and then I want create User with Conversation and Message at once. Idea should be like this:
User user = new User();
user.getPosts().add(new Conversation(){
{
getMessages().add(new Message());
}
});
session.persist(user);
But just User is saved in database - why isn't it all? Because of default LAZY fetching? Could my idea be implemented somehow?
PS: Of course I know about the solution of persisting each of the entities, but I am used to do like this in other frameworks like nette or Django, so I can't get out of my head.
PPS: I found out that problem is in default CascadeType. Could it be set on globally, e.g. in Hibernate config XML? Is it a good idea (by performance point of view - it is persisted each time on "superpersist" or only in case of changes)?
PPPS: I also found out (opposite to Django) that I have to set FK ex-post for each item added to collection. It is natural (because of selected pure Set type), but new for me. Which approach would you recommend me? Required FK as argument in constructor on item Entity e.g.:
Class Message{
Message(Conversation conversation){
setConversation(conversation);
}
...
}
or make a method for adding where FK sets inside e.g.:
Class Conversation{
...
public void addMessage(Message msg){
msg.setConversation(this);
getMessages().add(msg);
}
...
}
?
Making Session + configure XML.
private final static String CFG = "hibernate-cfg.xml";
private final static String SCRIPT_FILE = "query.sql";
private static SessionFactory sessionFactory;
private static ServiceRegistry buildRegistry() {
return new StandardServiceRegistryBuilder()
.configure(CFG)
.build();
}
private static Metadata getMetaData() {
return new MetadataSources(buildRegistry()).getMetadataBuilder().build();
}
private static SessionFactory buildSessionFactory() {
return getMetaData().getSessionFactoryBuilder().build();
}
public static SessionFactory getSessionFactory() {
if (sessionFactory == null) {
sessionFactory = buildSessionFactory();
}
return sessionFactory;
}
public static Session getSession(){
try {
return getSessionFactory().openSession();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
and the hibernate-cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/learnme
</property>
<property name="connection.username">root</property>
<property name="connection.password"/>
<property name="connection.pool_size">100</property>
<!-- SQL dialect -->
<property name="hibernate.dialect">
org.hibernate.dialect.MySQL5Dialect
</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">
org.hibernate.cache.NoCacheProvider
</property>
<!-- Display all generated SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<mapping class="learnme.hibernate.entities.User"/>
<mapping class="learnme.hibernate.entities.Conversation"/>
<mapping class="learnme.hibernate.entities.Message"/>
</session-factory>
</hibernate-configuration>
According to this and this
you need to have this in your persistence.xml file to set it globally:
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm
http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" version="1.0">
<persistence-unit-metadata>
<persistence-unit-defaults>
<cascade-persist/>
</persistence-unit-defaults>
</persistence-unit-metadata>
</entity-mappings>
The mapping file has to be located either in the default location,
META-INF/orm.xml, or in another location that is specified explicitly
in the persistence unit definition (in persistence.xml).
I am trying to create a basic hibernate application using hibernate 5.2.10 release. When I run it it says
org.hibernate.HibernateException: Unable to make JDBC Connection [jdbc:mysql//localhost:3306/hibernatedb]
hibernate.cfg.xml:
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">jdbc:mysql//localhost:3306/hibernatedb</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name="hibernate.cache.use_query_cache">true</property>
<property name="hibernate.hbm2ddl.auto">udpate</property>
<mapping class="com.chandu.app.model.UserDetails"/>
</session-factory>
Main class:
public class HibernateTest {
public static void main(String[] args) {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
UserDetails user = getUserObject();
session.save(user);
session.getTransaction().commit();
session.clear();
}
private static UserDetails getUserObject() {
UserDetails user = new UserDetails();
user.setUserName("Test User");
return user;
}
Console:
Code Structure:
I have gone through some of the forums, but couldnt find a solution for the same.
Thanks for the help!
jdbc:mysql//localhost:3306/hibernatedb
Use a colon (:) both before and after "mysql":
jdbc:mysql://localhost:3306/hibernatedb
I have a repository implementation class as below.
public class TesepositoryImpl extends OTPRepositoryBase implements
TestRepository {
public TesepositoryImpl() {
super(RequiresOTPSession.YES);
}
#Override
public int createPreference(AirDetail AirDetail)
throws PersistenceException {
Transaction tx = null;
Session session = null;
try {
session = otpDatabaseSession.openSession();
tx = session.beginTransaction();
session.save(AirDetail);
tx.commit();
} finally {
otpDatabaseSession.closeSession(session);
}
return AirDetail.getAirDetailId().intValue();
}
I have stated writting junit for the above
public class TesRepositoryImplTest {
private EmbeddedDatabase db;
#Before
public void setUp() {
db = new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.HSQL)
.addScript("db/sql/create-db.sql")
.addScript("db/sql/insert-data.sql").build();
}
TesRepository testRepository = new TestRepositoryImpl();
#Test
public void createPreference() throws Exception {
//*setting values** creating preference**/
int airRefereID = testRepository
.createPreference(preference);
}
#After
public void tearDown() {
db.shutdown();
}
i defined hibernate cfg file as below
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:mem:fcds</property>
<property name="connection.username">SA</property>
<property name="connection.password"></property>
<property name="connection.pool_size">10</property>
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="connection.autocommit">true</property>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.standard_service_registry_builder">false</property>
<mapping class="com.aa.dotc.commons.domain.preference" />
</session-factory>
</hibernate-configuration>
I need to know the below.
When I call testRepository
.createPreference(preference);
I need to override the otpsession to HSQL session.
Kindly help me how to achieve the above using HSQL or share any samples to achieve the same.