Question

I’ve got 5 files 3 xml and 2 java (to connect and execute HQL query),
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="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://host:3306/wwwgeeksearthcom_geeksearth_test</property>
    <property name="hibernate.connection.username">username</property>
    <property name="hibernate.connection.password">******</property>
    <property name="hibernate.show_sql">true</property>
    <mapping resource="hibernate.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

hibernate.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="client">
<class name="HiberTest" table="guests">
  <id name="id" column="g_id">
      <generator class="native"/>
  </id>
</class>
</hibernate-mapping>

hibernate.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-reverse-engineering PUBLIC "-//Hibernate/Hibernate Reverse Engineering DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-reverse-engineering-3.0.dtd">
<hibernate-reverse-engineering>
  <schema-selection match-catalog="wwwgeeksearthcom_geeksearth_test"/>
  <table-filter match-name="guests"/>
</hibernate-reverse-engineering>

HiberTest.java

import org.hibernate.*;
import org.hibernate.cfg.*;
import java.util.*;


public class HiberTest {

  private static SessionFactory sessionFactory;

  private int id;

  protected static void setUp() throws Exception {
      // A SessionFactory is set up once for an application
      sessionFactory = new Configuration()
              .configure() // configures settings from hibernate.cfg.xml
              .buildSessionFactory();
  }

  public static void main(String[] args) throws Exception {
    setUp();
    Session session = HibernateUtil.getSessionFactory().openSession();
    session.beginTransaction();
    Query q = session.createQuery("from guests");
        List resultList = q.list();
        System.out.println(resultList);
        session.getTransaction().commit();
        session.close();
  }

}

HibernateUtil.java

import org.hibernate.cfg.*;
import org.hibernate.SessionFactory;

/**
 * Hibernate Utility class with a convenient method to get Session Factory object.
 *
 * @author arthurkushman
 */
public class HibernateUtil {
    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;
    }

}

The error:

Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: guests is not mapped [from guests]
        at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:158)
        at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:87)
        at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:70)
        at org.hibernate.hql.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:255)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3056)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
        at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
        at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:228)
        at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
        at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
        at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
        at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
        at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
        at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
        at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
        at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
        at HiberTest.main(HiberTest.java:27)
Java Result: 1

Answer 1

HQL queries should specify the entity class, not the table name.

Looking at your mapping, that means "from HiberTest", instead of "from guests".

Having said that, your example makes no sense. The class specified in the mapping should refer to a persistent entity class (e.g. Guest), which is mapped to your guests database table. Your HiberTest class is a piece of test logic, and has nothing to do with the mapping.