My First Hibernate EntityManager

/META-INF/persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
  version="2.0">

  <persistence-unit name="org.hibernate.tutorial.jpa">
    <description>
            Persistence unit for the JPA tutorial of the Hibernate Getting Started Guide
        </description>

    <class>com.test.Cat</class>

    <properties>
      <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
      <property name="javax.persistence.jdbc.url"
        value="jdbc:postgresql://192.168.3.1:5432/testdb" />
      <property name="javax.persistence.jdbc.user" value="postgres" />
      <property name="javax.persistence.jdbc.password" value="postgres" />
      <property name="hibernate.show_sql" value="true" />
      <property name="hibernate.hbm2ddl.auto" value="update" />
    </properties>
  </persistence-unit>
</persistence>

CatTest.java

package com.test;

import static org.junit.Assert.*;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.LockModeType;
import javax.persistence.Persistence;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class CatTest {

    static EntityManagerFactory entityManagerFactory;

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        entityManagerFactory = Persistence
                .createEntityManagerFactory("org.hibernate.tutorial.jpa");
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
        entityManagerFactory.close();
    }

    @Before
    public void setUp() throws Exception {
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void test01() {
        EntityManager entityManager = entityManagerFactory
                .createEntityManager();
        entityManager.getTransaction().begin();

        Cat cat1 = new Cat();
        cat1.setName("Tom");

        entityManager.persist(cat1);

        Cat cat2 = new Cat();
        cat2.setName("Jerry");
        cat2.setAddress("newyork");

        entityManager.persist(cat2);

        entityManager.getTransaction().commit();
    }

    @Test
    public void test02() {
        EntityManager entityManager = entityManagerFactory
                .createEntityManager();
        entityManager.getTransaction().begin();

        try {

            Cat cat1 = entityManager.find(Cat.class, 1);
            System.out.println(cat1.getName());

            Cat cat2 = entityManager.find(Cat.class, 2,
                    LockModeType.PESSIMISTIC_READ);
            System.out.println(cat2.getName());

            cat2.setName("Jerry new");
            entityManager.flush();

            entityManager.getTransaction().commit();
        }
        catch (Exception e) {
            entityManager.getTransaction().rollback();
            e.printStackTrace();
        }
    }

    @Test
    public void test03() {
        EntityManager entityManager = entityManagerFactory
                .createEntityManager();

        entityManager.getTransaction().begin();

        try {
            List<Cat> list = entityManager.createQuery("from Cat order by id ",
                    Cat.class).getResultList();

            for (Cat cat : list) {
                System.out.println(cat.getName());
            }

            entityManager.getTransaction().commit();
        }
        catch (Exception e) {
            entityManager.getTransaction().rollback();
        }
    }
}

Cat.java

package com.test;

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

@Entity
public class Cat {
    private int id;
    private String name;
    private String address;
    private String telphone;

    @Column(name = "tphone")
    public String getTelphone() {
        return telphone;
    }

    public void setTelphone(String telphone) {
        this.telphone = telphone;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}