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Hibernate buildSessionFactory () Exception

I have a serious problem with sleep mode. I followed various books and interactive tutorials, but I have ever got the same ExceptionInInitializerError exception that is explicitly selected by the HibernateUtil.java line

SessionFactory sf = cfg.configure().buildSessionFactory();

My Tomcat log says the following:

 Caused by: java.lang.ExceptionInInitializerError at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:23) at de.marcelstuht.nerven2.server.HibernateUtil.<clinit>(HibernateUtil.java:8) at de.marcelstuht.nerven2.shared.model.Account.<init>(Account.java:52) at de.marcelstuht.nerven2.server.GreetingServiceImpl.loginServer(GreetingServiceImpl.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569) ... 21 more Caused by: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:180) at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:131) at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:345) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775) at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:18) ... 29 more Caused by: org.hibernate.InstantiationException: could not instantiate test objectde.marcelstuht.nerven2.shared.model.Account at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:49) at org.hibernate.engine.internal.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:68) at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:75) at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:143) at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:498) at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:142) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:158) ... 34 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:46) ... 44 more Caused by: java.lang.NullPointerException at de.marcelstuht.nerven2.shared.model.Account.<init>(Account.java:52) ... 49 more

Account.java

 package de.marcelstuht.nerven2.shared.model; import java.io.Serializable; import java.util.List; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; import javax.validation.constraints.NotNull; import org.apache.commons.codec.digest.DigestUtils; import org.hibernate.Session; import org.hibernate.criterion.*; import de.marcelstuht.nerven2.server.HibernateUtil; @Entity @Table(name = "account") public class Account implements Serializable { private static final long serialVersionUID = 2675108132819989138L; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") Long id; @NotNull @Column(name = "username", unique = true) String username; @Column(name = "password") String password; @Column(name = "email") String email; protected Session session; public Account() { session = HibernateUtil.getSessionFactory().openSession(); } public Account(Long id) { this.id = id; session = HibernateUtil.getSessionFactory().openSession(); } public Account(Long id, String username, String password, String email) { this.id = id; this.username = username; this.password = password; this.email = email; session = HibernateUtil.getSessionFactory().openSession(); } public void setId(Long newid) { id = newid; } public Long getId() { return id; } public void setUsername(String user) { username = user; } public String getUsername() { return username; } public void setEmail(String mail) { email = mail; } public String getEmail() { return email; } public void setPassword(String newPass) { password = newPass; } public void setNewPassword(String newPass) { password = hashPassword(newPass); } public boolean checkPassword(String pass) { pass = hashPassword(pass); if (password.equals(pass)) return true; else return false; } private String hashPassword(String password) { return DigestUtils.shaHex("wudu390909dfh"+password); } public Account get(Long id) { session.beginTransaction(); Account result = (Account) session.get("account", id); session.getTransaction().commit(); return result; } public Long saveOrUpdate(Account account) { if (account == null) { return null; } session.beginTransaction(); session.saveOrUpdate(account); Long id = (Long) session.getIdentifier(account); session.getTransaction().commit(); return id; } public void delete(Account account) { if (account == null) { return; } session.beginTransaction(); session.delete(account); session.getTransaction().commit(); } public List<Account> getAccountByUsername(String user) { session.beginTransaction(); @SuppressWarnings("unchecked") List<Account> result = session .createCriteria(Account.class) .add(Restrictions.eq("username", user)) .list(); session.getTransaction().commit(); return result; } }

HibernateUtil.java

 package de.marcelstuht.nerven2.server; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import org.jboss.logging.Logger; public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); protected HibernateUtil() { } private static SessionFactory buildSessionFactory() { try { // Create the SessionFactory from hibernate.cfg.xml Configuration cfg = new Configuration(); SessionFactory sf = cfg.configure().buildSessionFactory(); return sf; } catch (Exception ex) { // Make sure you log the exception, as it might be swallowed Logger.getLogger(HibernateUtil.class).error("Initial SessionFactory creation failed.", ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }

hibernate.cfg.xml

 <!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/ba</property> <property name="connection.username">*myuser*</property> <property name="connection.password">*mypassword*</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- Disable the second-level cache --> <!-- <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>--> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hibernate.bytecode.provider">javassist</property> <!-- Names the annotated entity class --> <mapping class="de.marcelstuht.nerven2.shared.model.Account"/> </session-factory>

I tried both Hibernate 3.6.9 and 4.0.1 (in different Eclipse projects). The screenshot of the JAR that I added to the project is available on Skitch: https://skitch.com/marcelstuht/g7h8h/properties-for-nerven2

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4 answers

aused by: java.lang.NullPointerException at de.marcelstuht.nerven2.shared.model.Account. (Account.java:52) ... 49 more

Remove anything from your constructor in the Account. You have a circular addiction. And Hibernate uses public no args consructor for its beans

  • HibernateUtil downloads
  • This causes static to run buildSessionFactory.
  • Hibernate launches an account with no arguments
  • This in turn causes HibernateUtil .....

Believe me: public no arg constructor with code NO, except for POJO setters. Nothing more.

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Please check javassist.XXjar in your classpath.

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I have encountered this problem before. In the end, I found that adding a non-annotated method to an entity where annotations decorate getter methods will force you into this situation. If you create annotations around fields, rather than getter methods, then you may have additional non-display methods.

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I also experienced "Failed to get constructor for org.hibernate.persister.entity.SingleTableEntityPersister" and adding javassist.XXjar to the classpath took care of that.

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