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How to aggregate functions in HIbernate

I am using "select max(pid) from Patient p" in hibernate using spring mvc framework and it is showing "Stacktrace:] with root cause
org.hibernate.hql.internal.ast.QuerySyntaxException: Patient is not mapped" and lots more error. Why???
<%
Configuration cfg = new Configuration();
cfg.configure("doc.cfg.xml");
SessionFactory sf = cfg.buildSessionFactory();
Session s = sf.openSession();
Query q = s.createQuery("select max(pid) from Patient p");
List lst = q.list();
%>
Actually I want the value
<%=lst %>
and want to get the max of pid from my POJO class Patient from the database patient having pid as integer values.
patient.java
package dao;
public class patient {
private String ppass , pname , mob , age , sex , addr;
private int pid;
public String getPpass() {
return ppass;
}
public void setPpass(String ppass) {
this.ppass = ppass;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public String getMob() {
return mob;
}
public void setMob(String mob) {
this.mob = mob;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddr() {
return addr;
}
public void setAddr(String addr) {
this.addr = addr;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
}
and
doc.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/doctoapp</property>
<property name="connection.username">root</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
<!-- student class ka mapping -->
<mapping resource="doc.hbm.xml"/>
<mapping resource="pat.hbm.xml"/>
</session-factory>
</hibernate-configuration>

Composite key with one to many hibernate

I'm having a big problem trying to make this little program work
Here are my objects:
Class Country
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
public class Country implements Serializable {
private static final long serialVersionUID = 4947071545454L;
private String countryID;
private String countryName;
private Set<City> cities = new HashSet<City>();
public Country() {
}
public Country(String countryID, String countryName, Set<City> cities) {
this.countryID = countryID;
this.countryName = countryName;
this.cities = cities;
}
public static long getSerialVersionUID() {
return serialVersionUID;
}
public String getCountryID() {
return countryID;
}
public void setCountryID(String countryID) {
this.countryID = countryID;
}
public String getCountryName() {
return countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public Set<City> getCities() {
return cities;
}
public void setCities(Set<City> cities) {
this.cities = cities;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Country country = (Country) o;
return countryID != null ? countryID.equals(country.countryID) : country.countryID == null;
}
#Override
public int hashCode() {
return countryID != null ? countryID.hashCode() : 0;
}
public boolean addCity(City c){
return cities.add(c);
}
public boolean removeCity(City c){
return cities.remove(c);
}
}
Class City
import java.io.Serializable;
public class City implements Serializable{
private static final long serialVersionUID = 49470713545454L;
private String cityName;
private Country id;
public City(String cityName, Country id) {
this.cityName = cityName;
this.id = id;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public Country getId() {
return id;
}
public void setId(Country id) {
this.id = id;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
City city = (City) o;
if (cityName != null ? !cityName.equals(city.cityName) : city.cityName != null) return false;
return id != null ? id.equals(city.id) : city.id == null;
}
#Override
public int hashCode() {
int result = cityName != null ? cityName.hashCode() : 0;
result = 31 * result + (id != null ? id.hashCode() : 0);
return result;
}
}
An here are my xml archives:
country.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.samuel.hibernate.Country" table="country" catalog="training2">
<id name="country" type="string" column="countryID">
<generator class="assign"/>
</id>
<property name="countryName" type="string">
<column name="countryName" length="40" not-null="true" unique="true" />
</property>
<set name="city" inverse="true" cascade="all">
<key column="countryID" not-null="true" />
<one-to-many class="com.samuel.hibernate.City"/>
</set>
</class>
</hibernate-mapping>
city.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.samuel.hibernate.City" table="city" catalog="training2">
<composite-id name="id">
<key-many-to-one name="countryID" class="com.samuel.hibernate.Country"
column="countryID" />
<key-property name="cityName" column="cityName" type="string"/>
</composite-id>
</class>
</hibernate-mapping>
And here's my main class:
Main class
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import java.util.HashSet;
import java.util.Set;
public class Main {
public static void main(String[] args) {
System.out.println("..");
Configuration cfg=new Configuration();
cfg.configure("hibernate.cfg.xml");
// aquí es donde peta si falla conexión con Postgres
//creating seession factory object
System.out.println("Antes de crear sesion");
SessionFactory factory=cfg.buildSessionFactory();
System.out.println("Despues de crear sesion");
//creating session object
Session session=factory.openSession();
//creating transaction object
Transaction t=session.beginTransaction();
Set<City> citiesSpain = new HashSet<>();
Country spain = new Country("es","Spain",citiesSpain);
citiesSpain.add(new City("Barcelona",spain));
citiesSpain.add(new City("Madrid",spain));
session.persist(spain);
t.commit();
session.close();
factory.close();
System.out.println("END");
}
}
When I execute this code I get this error message:
Exception in thread "main" org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.component.PojoComponentTuplizer]
at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:98)
at org.hibernate.tuple.component.ComponentTuplizerFactory.constructDefaultTuplizer(ComponentTuplizerFactory.java:119)
at org.hibernate.tuple.component.ComponentMetamodel.<init>(ComponentMetamodel.java:68)
at org.hibernate.mapping.Component.getType(Component.java:169)
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:422)
at org.hibernate.mapping.RootClass.validate(RootClass.java:266)
at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:329)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:451)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:710)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
at com.samuel.hibernate.Main.main(Main.java:22)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:95)
... 10 more
Caused by: org.hibernate.PropertyNotFoundException: Could not locate getter method for property [com.samuel.hibernate.Country#cityName]
at org.hibernate.internal.util.ReflectHelper.findGetterMethod(ReflectHelper.java:418)
at org.hibernate.property.access.internal.PropertyAccessBasicImpl.<init>(PropertyAccessBasicImpl.java:41)
at org.hibernate.property.access.internal.PropertyAccessStrategyBasicImpl.buildPropertyAccess(PropertyAccessStrategyBasicImpl.java:27)
at org.hibernate.mapping.Property.getGetter(Property.java:308)
at org.hibernate.tuple.component.PojoComponentTuplizer.buildGetter(PojoComponentTuplizer.java:138)
at org.hibernate.tuple.component.AbstractComponentTuplizer.<init>(AbstractComponentTuplizer.java:47)
at org.hibernate.tuple.component.PojoComponentTuplizer.<init>(PojoComponentTuplizer.java:41)
... 15 more
I've tried looking online but I don't seem to find the solution. In my example, one country can have many cities, but one city can only have on country.

This error means that one or more setters/getters is missing. Make sure you define matching getters/setters for all your properties. And make sure that your properties annotated correctly.
I think that problem is that your cities set name is different in a class and in hbm.xml file. In your entity class you defined set as Set<City> cities and in your XML file you defined this property as name="city". So hibernate is searching setters and getters for city named property.
Make sure that variable and property name coincides. And add empty constructor in City.class.

MySQL table not mapped by Hibernate 5+

I'm trying to learn Hibernate using MySQL built-in database named world. It has three tables called city, country and countrylanguage. What I'm trying to do is execute SQL statement SELECT * FROM world.city;. When I run my project I'm getting error
org.hibernate.hql.internal.ast.QuerySyntaxException: City is not mapped [from City]
I'm using IntelliJ IDEA and Hibernate 5.2.8.
I created mapping xml file like this:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="pl.hibernatePackage">
<class name="City" table="city">
<id name="id" column="ID" type="int">
<generator class="native"/>
</id>
<property name="name" column="Name" type="string"/>
<property name="countryCode" column="CountryCode" type="string"/>
<property name="district" column="District" type="string"/>
<property name="population" column="Population" type="int"/>
</class>
</hibernate-mapping>
City.java is presented below:
public class City
{
private Integer id;
private String name;
private String countryCode;
private String district;
private Integer population;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
public Integer getPopulation() {
return population;
}
public void setPopulation(Integer population) {
this.population = population;
}
}
I'm creating session in HibernateUtil.java
public class HibernateUtil
{
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
StandardServiceRegistryBuilder standardServiceRegistryBuilder = new StandardServiceRegistryBuilder();
standardServiceRegistryBuilder.applySettings(configuration.getProperties());
ServiceRegistry serviceRegistry = standardServiceRegistryBuilder.build();
return configuration.buildSessionFactory(serviceRegistry);
}
catch(Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Configuration file
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/world</property>
<property name="hibernate.connection.username">test</property>
<property name="hibernate.connection.password">1234</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">false</property>
<property name="hbm2ddl.auto">update</property>
<!-- List of XML mapping files -->
<mapping resource="pl/hibernatePackage/City.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Main
public class Main
{
public static void main(String[] args)
{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List<City> cities = session.createQuery("from City").list();
for(City c : cities) {
System.out.println(c.getId() + "\t" + c.getName() + "\t" + c.getCountryCode() + "\t" + c.getDistrict() +
"\t" + c.getPopulation());
}
session.getTransaction().commit();
HibernateUtil.getSessionFactory().close();
}
}
EDIT Full error list
EDIT 2
javac result

I have done some testing and i made it work by using the fully qualified class name:
session.createQuery("from pl.hibernatePackage.City")
Now this is only a workaround without touching your config..
After digging deeper i found out that since hibernate version 5.x, there is a different strategy for building the sessionFactory.
I made your example work by implementing sessionFactory as follows:
StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
.configure()
.build();
Metadata metadata = new MetadataSources( standardRegistry )
.getMetadataBuilder()
.build();
return configuration.buildSessionFactory(serviceRegistry);
This is explained with example here: jboss documentation (point 2.4)

Thanks to Maciej's answer and help of other guys I managed to get my example to work by modifying code and cleaning it up a little. I also found out that mapping DB with xml file is outdated so I modifiied properly CityEntity class. Final code:
Main.java
import org.hibernate.Session;
import java.util.List;
public class Main
{
public static void main(String[] args)
{
Session session = HibernateUtil.getSession();
session.beginTransaction();
List<CityEntity> cities = session.createQuery("from CityEntity").list();
for(CityEntity c : cities)
{
System.out.println(c.getId() + "\t" + c.getName() + "\t" + c.getCountryCode() + "\t" + c.getDistrict() +
"\t" + c.getPopulation());
}
session.getTransaction().commit();
HibernateUtil.close();
}
}
hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/world</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">1234</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<!-- List of mapped classes -->
<mapping class="CityEntity"/>
</session-factory>
</hibernate-configuration>
HibernateUtil.java
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil
{
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
.configure()
.build();
return configuration.buildSessionFactory(standardRegistry);
}
catch(Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static Session getSession()
{
return sessionFactory.openSession();
}
public static void close()
{
sessionFactory.close();
}
}
CityEntity.java
import javax.persistence.*;
#Entity
#Table(name = "city", schema = "world")
public class CityEntity
{
private int id;
private String name;
private String countryCode;
private String district;
private int population;
#Basic
#Column(name = "CountryCode")
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
#Id
#Column(name = "ID")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#Basic
#Column(name = "Name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Basic
#Column(name = "District")
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
#Basic
#Column(name = "Population")
public int getPopulation() {
return population;
}
public void setPopulation(int population) {
this.population = population;
}
}

upgrading from Hiberante 3 to Hibernate 4 can't persist data to datatbase

OK, we have an Hibernate 3 application that I am trying to update to hibernate 4. I can retrieve the data without any problem, but cannot add or update the database. I don't get any error messages, the transaction seems to work, but nothing gets changed in the database. Some help would be greatly appreciated.
Here's the config file 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="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="hibernate.connection.datasource">jdbc/misc</property>
<property name="hibernate.jndi.url">iiop://127.0.0.1:3700</property>
<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
<property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.SunONETransactionManagerLookup</property>
<mapping resource="sponsor.hbm.xml"/>
<mapping resource="portfolio.hbm.xml"/>
<mapping resource="clientID.hbm.xml"/>
<mapping resource="legacyID.hbm.xml"/>
<mapping resource="badClient.hbm.xml"/>
<mapping resource="language.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Here's a sam;ole map file of the table I am currently working with sponsor.hbm.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!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.lingosys.hibernate.Sponsor" table="sponsor">
<id name="companyID" type="integer">
<generator class="assigned"/>
</id>
<property name="companyName" type="string"/>
<property name="sponsorID" type="integer"/>
<property name="sponsorName" type="string"/>
<property name="status" type="string"/>
</class>
</hibernate-mapping>
Here's the class for creating the session factory HibenateUtil.java:
package com.lingosys.hibernate;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
/**
* Hibernate Utility class with a convenient method to get Session Factory object.
*
* #author mphoenix
*/
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from standard (hibernate.cfg.xml)
// config file.
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
// Log the exception.
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Here's the dao file SponsorDAO.java:
package com.lingosys.hibernate;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
/**
*
* #author mphoenix
*/
public class SponsorDAO {
private Session session = null;
public SponsorDAO() {
}
private void startOperation() {
session = HibernateUtil.getSessionFactory().openSession();
}
public void create(Sponsor sponsor) {
startOperation();
session.saveOrUpdate("Sponsor", sponsor);
session.close();
}
public void update(Sponsor sponsor) {
startOperation();
session.update("Sponsor", sponsor);
session.close();
}
public Sponsor findSponsor(int id) {
startOperation();
Sponsor sponsor = (Sponsor) session.get(Sponsor.class, new Integer(id));
session.close();
return sponsor;
}
public List <Sponsor> findAllSponsors() {
List <Sponsor> sponsors = null;
startOperation();
Query query = session.createQuery("from Sponsor");
sponsors = query.list();
session.close();
return sponsors;
}
public void delete(Sponsor sponsor) {
startOperation();
session.delete(sponsor);
session.close();
}
}
Here's the create transaction code:
UserTransaction tx = null;
try {
tx = (UserTransaction)new InitialContext()
.lookup("java:comp/UserTransaction");
tx.begin();
dao.create(sponsor);
tx.commit();
} catch (HibernateException ex) {
try {
tx.rollback();
} catch (Exception ex2) {
facesCtx.addMessage(null, new FacesMessage("Error on rollback.",
ex2.toString()));
}
facesCtx.addMessage(null, new FacesMessage("Hibernate Error.",
ex.toString()));
return null;
} catch (Exception ex) {
facesCtx.addMessage(null, new FacesMessage("Non-hibernate Error.",
ex.toString()));
return null;
}
Here's a retrieval transaction:
try {
tx = (UserTransaction)new InitialContext()
.lookup("java:comp/UserTransaction");
tx.begin();
setSponsorItems(new ArrayList<Sponsor>());
List<Sponsor> sponsors = dao.findAllSponsors();
for (Sponsor aSponsor : sponsors) {
if (companyItemsMap.get(aSponsor.getCompanyID()) != null) {
getSponsorItems().add(aSponsor);
}
}
tx.commit();
} catch (HibernateException ex) {
try {
tx.rollback();
} catch (Exception ex2) {
facesCtx.addMessage(null, new FacesMessage(ex2.toString()));
}
facesCtx.addMessage(null, new FacesMessage(ex.toString()));
return false;
} catch (Exception ex) {
facesCtx.addMessage(null, new FacesMessage(ex.toString()));
return false;
}
And finally the object being mapped to Sponsor.java
package com.lingosys.hibernate;
import java.io.Serializable;
/**
*
* #author mphoenix
*/
public class Sponsor implements Serializable {
private int companyID;
private String companyName;
private int sponsorID;
private String sponsorName;
private String status;
public Sponsor() {
}
public int getCompanyID() {
return companyID;
}
public void setCompanyID(int companyID) {
this.companyID = companyID;
}
public String getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public int getSponsorID() {
return sponsorID;
}
public void setSponsorID(int sponsorID) {
this.sponsorID = sponsorID;
}
public String getSponsorName() {
return sponsorName;
}
public void setSponsorName(String sponsorName) {
this.sponsorName = sponsorName;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
#Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Sponsor other = (Sponsor) obj;
if (this.companyID != other.companyID) {
return false;
}
return true;
}
#Override
public int hashCode() {
int hash = 5;
hash = 97 * hash + this.companyID;
return hash;
}
//DEBUG CASPERW
#Override
public String toString() {
return "CompanyID: "+companyID+" CompanyName: "+companyName+" SponsorID: "+sponsorID+" SponsorName: "+sponsorName+"\n";
}
}

hibernate doesn't see a setter

I am new to hibernate and I have stupid problem. My files:
hibernate.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
org.hibernate.dialect.PostgreSQLDialect
</property>
<property name="hibernate.connection.driver_class">
org.postgresql.Driver
</property>
<!-- Assume test is the database name -->
<property name="hibernate.connection.url">
jdbc:postgresql://localhost/booktown
</property>
<property name="hibernate.connection.username">
mirek
</property>
<mapping resource="Books.hbm.xml"/>
</session-factory>
</hibernate-configuration>
books.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Books" table="books">
<meta attribute="Książki w booktown">
This class contains the employee detail.
</meta>
<id name="id" type="int" column="id">
<generator class="native"/>
</id>
<property name="title" column="title" type="string"/>
<property name="author_id" column="author_id" type="int"/>
<property name="subject_id" column="subject_id" type="int"/>
</class>
</hibernate-mapping>
Books.java
public class Books
{
private int id;
private String title;
private int author_id;
private int subject_id;
public Books(String title, int author_id, int subject_id)
{
this.title = title;
this.author_id = author_id;
this.subject_id = subject_id;
}
public void setId(int id)
{
this.id = id;
}
public void setTitle(String title)
{
this.title = title;
}
public void setAuthorId(int author_id)
{
this.author_id = author_id;
}
public void setSubjectId(int subject_id)
{
this.subject_id = subject_id;
}
public int getId()
{
return id;
}
public String getTitle()
{
return title;
}
public int getAuthorId()
{
return author_id;
}
public int getSubjectId()
{
return subject_id;
}
}
and Booktown.java
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
public class Booktown
{
private static SessionFactory factory;
private static ServiceRegistry serviceRegistry;
public static void main(String[] args)
{
try
{
//private static SessionFactory configureSessionFactory() throws HibernateException {
Configuration configuration = new Configuration();
configuration.configure();
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
factory = configuration.buildSessionFactory(serviceRegistry);
//return factory;
//factory = new Configuration().configure().buildSessionFactory();
}
catch (Throwable ex)
{
System.err.println("Failed to create sessionFactory object." + ex.toString());
throw new ExceptionInInitializerError(ex);
}
Booktown BT = new Booktown();
/* Add few employee records in database */
Integer bID1 = BT.addBook(10, "Jakiś napis", 10, 30);
Integer bID2 = BT.addBook(20, "Jakiś inny napis", 10, 50);
//Integer bID3 = BT.addBook(30, "John", 10000, 14);
/* List down all the employees */
BT.listBooks();
/* Update employee's records */
BT.updateBook(bID1, 5000);
/* Delete an employee from the database */
BT.deleteBook(bID2);
/* List down new list of the employees */
BT.listBooks();
}
/* Method to CREATE a book in the database */
public Integer addBook(int bid, String fname, int lname, int salary)
{
Session session = factory.openSession();
Transaction tx = null;
Integer bID = null;
try
{
tx = session.beginTransaction();
Books book = new Books(fname, lname, salary);
bid = (Integer) session.save(book);
tx.commit();
}
catch (HibernateException e)
{
if (tx != null)
tx.rollback();
e.printStackTrace();
}
finally
{
session.close();
}
return bID;
}
/* Method to READ all the books */
public void listBooks()
{
Session session = factory.openSession();
Transaction tx = null;
try
{
tx = session.beginTransaction();
List<Books> books = session.createQuery("FROM books").list();
for (Iterator<Books> iterator = books.iterator(); iterator.hasNext();)
{
Books book = (Books) iterator.next();
System.out.print("First Name: " + book.getTitle());
System.out.print(" Last Name: " + book.getAuthorId());
System.out.println(" Salary: " + book.getSubjectId());
}
tx.commit();
}
catch (HibernateException e)
{
if (tx != null)
tx.rollback();
e.printStackTrace();
}
finally
{
session.close();
}
}
/* Method to UPDATE author for a book */
public void updateBook(Integer bID, int auth)
{
Session session = factory.openSession();
Transaction tx = null;
try
{
tx = session.beginTransaction();
Books book = (Books) session.get(Books.class, bID);
book.setAuthorId(auth);
session.update(book);
tx.commit();
}
catch (HibernateException e)
{
if (tx != null)
tx.rollback();
e.printStackTrace();
}
finally
{
session.close();
}
}
/* Method to DELETE a book from the records */
public void deleteBook(Integer bID)
{
Session session = factory.openSession();
Transaction tx = null;
try
{
tx = session.beginTransaction();
Books book = (Books) session.get(Books.class, bID);
session.delete(book);
tx.commit();
}
catch (HibernateException e)
{
if (tx != null)
tx.rollback();
e.printStackTrace();
}
finally
{
session.close();
}
}
}
Code is compiling but at run I get:
> paź 15, 2013 8:44:38 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Failed to create sessionFactory object.org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
Exception in thread "main" java.lang.ExceptionInInitializerError
at Booktown.main(Booktown.java:34)
Caused by: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:185)
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:135)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:385)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
at Booktown.main(Booktown.java:25)
Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:138)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:188)
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:341) at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:507)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:146)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:163)
... 4 more
Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:135)
... 13 more
Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for author_id in class Books
at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:316)
at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:310)
at org.hibernate.mapping.Property.getGetter(Property.java:321)
at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:444)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:200)
at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:82)
... 18 more
I found similar problem there was no setter. In my case system says that there is no getter for author_id but it is at line 45 in Books.java.
Could sb tells me what is wrong? Maybe there is an other cause which I don't see...

public int getAuthorId()
{
return author_id;
}
should be (observe, author_id)
public int getAuthor_id()
{
return author_id;
}
OR update XML as #Boris the spider commented.

As far as I know Hibernate requires a no-arg constructor which your Books class does seem to have. So even if you get the save part working I think your code will fail when you attempt to load.
Thus, create a constructor:
public Books(){
}
Why does Hibernate require no argument constructor?
Also, as pointed out previously ditch the XML and use JPA annotations. In line with standard Java conventions rename Books to Book and remove the _ from your variable names.
Alan

I had once this problem and I fix it like that:
You should Generate Constructor, Getters and Setters in NetBeans IDE ( I'm working with IDE is netbeans) so you have to press shortcut ALT+Insert (CTLRL+I on Mac). After invoking the shortcut, all possible generators are offered.