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Editorial Team
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Asked: 2026-06-03T14:21:33+00:00

I’m learning Java EE 6 and I’m beginning with basic tutorials trying to really

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I’m learning Java EE 6 and I’m beginning with basic tutorials trying to really understand all the infrastructure and playing a little bit with it.

So I did a basic tutorial (this one) about using JPA. The only difference is that I changed the ObjectDB implementation for Hibernate.

It is very simple, it has an Entity, a DAO Session Bean, a Servlet and a JSP. The only thing that it does is that you register names and it shows the names to you. I configured Hibernate to work with a postgres database and in the persistence.xml file put the following:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" 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_2_0.xsd">
  <persistence-unit name="TutorialGuestBook1PU" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>jdbc/__default</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
    </properties>
  </persistence-unit>
</persistence>

Everything is working ok, but I cannot see where is being saved the information that I’m saving with the sample application. I know that it must be somewhere but I query the postgres database and I cannot find it.

Where should be the information? Is something about the default datasource or something like that? Can anyone light me?

Thanks in advance.

Best regards,

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1 Answer

  1. Editorial Team

    Here’s what I found when I searched “GlassFish default datasouce”, first hit:

    http://docs.oracle.com/cd/E18930_01/html/821-2424/gksmw.html

    The jdbc/__default Java DB database is preconfigured with Embedded GlassFish Server. It is used when an application is deployed in Embedded GlassFish Server that uses Java Persistence but doesn’t specify a data source. Embedded GlassFish Server uses the embedded Java DB database created in a temporary domain that is destroyed when Embedded GlassFish Server is stopped.

    IIRC it’s the same on the non-embedded, but haven’t checked in awhile. Simple enough search, though.

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