package de.backend.persistence.entity;

import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Id;
import javax.persistence.Column;
import java.io.Serializable;

@Entity
@Table(name="user")
public class EntityUser
        implements Serializable {

    @Id
    @Column(name="id")
    private Long id;

    @Column(name="login_name")
    private String loginName;

    @Column(name="login_pass")
    private String loginPassword;


    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    public String getLoginPassword() {
        return loginPassword;
    }

    public void setLoginPassword(String loginPassword) {
        this.loginPassword = loginPassword;
    }

}

package de.backend.persistence.dao;

import org.hibernate.SessionFactory;
import org.hibernate.Session;

import javax.naming.InitialContext;

import de.backend.persistence.entity.EntityUser;


public class DAOUser {

    public void storeUser(EntityUser user)
            throws Exception {
        InitialContext ctx = new InitialContext();
        SessionFactory factory = (SessionFactory)ctx.lookup("java:/hibernate/SessionFactoryBase");
        Session hsession = factory.openSession();
        hsession.beginTransaction();
        hsession.save(user);
        hsession.getTransaction().commit();
    }

}

<server>
    <mbean code="org.jboss.hibernate.jmx.Hibernate" name="jboss.har:service=Hibernate">
        <attribute name="DatasourceName">java:/base</attribute>
        <attribute name="Dialect">org.hibernate.dialect.PostgreSQLDialect</attribute>
       <attribute name="DefaultSchema">public</attribute>
        <attribute name="SessionFactoryName">java:/hibernate/SessionFactoryBase</attribute>
        <attribute name="CacheProviderClass">org.hibernate.cache.HashtableCacheProvider</attribute>
        <!--<attribute name="Hbm2ddlAuto">create-drop</attribute>-->
        <attribute name="ShowSqlEnabled">true</attribute>
    </mbean>
</server>

11:19:11,437 ERROR [STDERR] org.hibernate.MappingException: Unknown entity: de.backend.persistence.entity.EntityUser
   at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
   at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
   at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
   at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
   at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
   at de.backend.persistence.dao.DAOUser.storeUser(DAOUser.java:23)
   at de.backend.crs.bean.calculator.CalculatorBean.storeMyUser(CalculatorBean.java:52)
   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 org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
   at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
   at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)

        EntityUser myUser = new EntityUser();
        myUser.setLoginName("loginName");
        myUser.setLoginPassword("loginPassword");

        DAOUser dao = new DAOUser();
        try {
            dao.storeUser(myUser);
        } catch (Exception e) {
            e.printStackTrace();
        }