> I followed your tutorial to setup a Java/JPA project.

> I am using a MySQL 5  database together with the MySQLConnector v5.0.4
> and EclipseLink 1.0.2.

> I defined a set of additional entities. Automatic creation of DDL in
> the database works. I successfully create some entries in the tables
> programatically, starting with a JUnit4 Test.

> The problem is, that everytime I create a new entity manager all
> mapped tables are truncated. Thus, every query on a new entity manager
> returns an empty result.

> The test case:
>  @Before
>  public void setUp() throws Exception {
>    emf = Persistence.createEntityManagerFactory("TestJPA");
>  }

>  @Test
>  public void doNothing() {
>    emf.createEntityManager().close();
>  }

>  @After
>  public void tearDown() {
>    emf.close();
>  }

> results in an empty database.

> I am afraid, I have some kind of fundamental misunderstanding. Your
> tutorial and all others that I have found do a setup (@Before) that
> creates all queried data in advance, but it is never explain why. How
> can I read peristed data? Is this truncation normal JPA behaviour and
> simply used in a wrong way on my side, or is it an EclipseLink
> implementation issue?

> This is my persistence.xml:
> <?xml version="1.0" encoding="UTF-8"?>
> <persistence version="1.0" 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_1_0.xsd">
>  <persistence-unit name="TestJPA" transaction-type="RESOURCE_LOCAL">
>    <provider>org.eclipse.persistence.jpa.PersistenceProvider</
> provider>
>    <class>model.Family</class>
>    <class>model.Job</class>
>    <class>model.Person</class>
>    <class>model.OfficeJob</class>
>    <class>model.OutdoorJob</class>
>    <class>model.Animal</class>
>    <properties>
>      <property name="eclipselink.jdbc.url" value="jdbc:mysql://
> localhost:3306/test01"/>
>      <property name="eclipselink.jdbc.user" value="root"/>
>      <property name="eclipselink.jdbc.password" value=""/>
>      <property name="eclipselink.jdbc.driver"
> value="com.mysql.jdbc.Driver"/>
>      <property name="eclipselink.ddl-generation" value="drop-and-
> create-tables" />
>      <property name="eclipselink.ddl-generation.output-mode"
> value="database" />
>      <property name="eclipselink.target-database" value="Auto"/>
>  </properties>
> </persistence-unit>
> </persistence>

> Thank you for your help in advance,

> Andi