package de.ostfalia.entity;

import java.sql.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@SuppressWarnings("javadoc")
@Entity
public class Customer {
    @Id
    @GeneratedValue
    @Column(name = "id")
    private int id;
    private String firstname;
    private String lastname;
    private Date birthday;
    private String email;

    // private Credentials login;
    // private String password;

    public Customer() {
        // TODO Auto-generated constructor stub
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(final String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(final String lastname) {
        this.lastname = lastname;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(final String email) {
        this.email = email;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(final Date birthday) {
        this.birthday = birthday;
    }

}

package de.ostfalia.manager.impl;

import java.io.Serializable;
import java.util.List;
import java.util.logging.Logger;

import javax.annotation.PostConstruct;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Produces;
import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.transaction.UserTransaction;

import de.ostfalia.entity.Customer;
import de.ostfalia.manager.ICustomerManager;

@SuppressWarnings("javadoc")
@Named
@RequestScoped
public class CustomerManager implements ICustomerManager, Serializable {
    /**
     *
     */
    private static final long serialVersionUID = 1L;

    @Inject
    private transient Logger logger;
    @Inject
    private EntityManager entityManager;
    @Inject
    private UserTransaction utx;
    private Customer customer;

    @PostConstruct
    public void init() {
        this.customer = new Customer();
    }

    @SuppressWarnings("unchecked")
    @Override
    @Produces
    @Named
    public List<Customer> getCustomers() throws Exception {
        try {
            try {
                utx.begin();
                return this.entityManager.createQuery("select c from Customer c").getResultList();
            } finally {
                utx.commit();
            }
        } catch (final Exception e) {
            utx.rollback();
            throw e;
        }
    }

    @Override
    public String saveCustomer() throws Exception {
        try {
            try {
                utx.begin();
                entityManager.persist(this.customer);
                logger.info("Added " + customer);
            } finally {
                utx.commit();
            }
        } catch (final Exception e) {
            utx.rollback();
            throw e;
        }
        return "customer added!";
    }

    @Override
    public Customer findCustomer(final String username, final String password) throws Exception {
        try {
            try {

                utx.begin();

                @SuppressWarnings("unchecked")
                final

                List<Customer> results = entityManager
                        .createQuery(
                                "select u from User u where u.username=:username and u.password=:password")
                        .setParameter("username", username)
                        .setParameter("password", password).getResultList();

                if (results.isEmpty()) {
                    return null;

                } else if (results.size() > 1) {
                    throw new IllegalStateException(
                            "Cannot have more than one user with the same username!");
                } else {
                    return results.get(0);
                }
            } finally {
                utx.commit();
            }
        } catch (final Exception e) {
            utx.rollback();
            throw e;
        }
    }

    @Override
    @Produces
    @Named
    public Customer getCustomer() {
        // TODO Auto-generated method stub
        return this.customer;
    }
}

...
 <h:form id="form">
        <h:head>
            <h1 align="center">JavaEE - Master</h1>
        </h:head>

        <h:body>
            <h3 align="center">Bitte legen Sie einen neuen Kunden an</h3>
            <h:panelGrid id="panel" columns="4" border="3">
                <h:outputText value="Firstname " />
                <h:inputText id="firstname" value="#{customerManager.customer.setFirstname}" required="true"/>

                <h:outputText value="Lastname " />
                <h:inputText id="lastname" value="#{customerManager.customer.setLastname}" required="true"/>

                <h:outputText value="Birthday " />
                <h:inputText id="birthday" value="#{customerManager.customer.setBirthday}" />

                <h:outputText value="e-mail " />
                <h:inputText id="email" value="#{customerManager.customer.setEmail}" />
            </h:panelGrid>
            <h:commandButton id="button" value="save" action="#{customerManager.saveCustomer}"/>
        </h:body>
    </h:form>
    </html>