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no error but entity is not persisted

 
Greenhorn
Posts: 6
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hi,

i have the following bean:
@Stateless
public class LibraryServicesBean implements LibraryServicesLocal {
@PersistenceContext
EntityManager em;

public void test() {

Category cat = new Category();
cat.setCategoryName("aaa");
em.persist(cat);

}
}

(Category is a normal entity bean which i can persist when i dont use session beans.)

and the following code in the client:

@EJB
static LibraryServicesLocal library;

public static void main(String[] args) {

library.test();
}

I use netbeans and its local DB.

when i run the application i get no exceptions but the entity is not persisted. (i check the db and there are no tables).

any ideas of what i'm doing wrong?

thank you.
 
Greenhorn
Posts: 15
Eclipse IDE Firefox Browser Oracle
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Hi Dan:

@Stateless
public class LibraryServicesBean implements LibraryServicesLocal {

@PersistenceContext EntityManager em;

public void addCategory(Category cat) {
em.persist(cat);
}
}

The client (Suppose what client is managed-container) :

@EJB private LibraryServicesLocal library;

public static void main(String[] args) {

Category cat = new Category();
cat.setCategoryName("aaa");
library.addCategory(cat );
}

If persist() is called within a transaction, the insert may happen immediately, or it may be queued until the end of the transaction, depending on the flush mode. You may force the insertion manually within a transaction by calling the flush() method.

By.
 
dan volfman
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hi
i tried adding flush() after the persist but it is still the same.

just a thought: shouldnt the tables be created anyway? even before i persist entities?
my db is empty, no tables.
is it possible i'm doing something wrong in the persistence unit?

here's the code:

<?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="LibraryApp-ejbPU" transaction-type="JTA">
<provider>oracle.toplink.essentials.PersistenceProvider</provider>
<non-jta-data-source/>
<class>entities.Category</class>
<class>entities.Book</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="toplink.jdbc.user" value="nbuser"/>
<property name="toplink.jdbc.password" value="nbuser"/>
<property name="toplink.jdbc.url" value="jdbc:derby://localhost:1527/LibraryDB"/>
<property name="toplink.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="toplink.ddl-generation" value="drop-and-create-tables"/>
<property name="toplink.ddl-generation" value="drop-and-create-tables"/>
</properties>
</persistence-unit>
 
Yair Ivan
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Hi:

In that case definitely have to check persistence.xml.

If you define the attribute transaction-type="JTA" also need datasource.

Try this:

<?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="LibraryApp-ejbPU" transaction-type="JTA">
<provider>oracle.toplink.essentials.PersistenceProvider</provider>
<jta-data-source>jdbc/MyDataSource</jta-data-source>
<properties>
<property name="toplink.logging.level" value="INFO"/>
<property name="toplink.jdbc.user" value="nbuser"/>
<property name="toplink.jdbc.password" value="nbuser"/>
<property name="toplink.jdbc.url" value="jdbc:derby://localhost:1527/LibraryDB"/>
<property name="toplink.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="toplink.ddl-generation" value="drop-and-create-tables"/>
</properties>
</persistence-unit>

See the following "TopLink JPA Persistence Unit Extensions":

http://www.oracle.com/technology/products/ias/toplink/JPA/essentials/toplink-jpa-extensions.html
 
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