On Friday, I decided it was time to play with JBoss and Hibernate.
So I took a small portion of my working Hibernate2 GUI app and with a little cut n paste created a stateless session bean, which contains my hibernate code.
The trouble im having, and this maybe due to my lack of understanding, is with transactions.
In my GUI app I have many funtions that resemble
Code:
void someBusinessMethod( ) {
Session session = getSession();
tx = session.beginTransaction();
/// HACK THE DB.
tx.commit();
}
I have converted these to session bean functions that look like
Code:
/** Create a new Purchase Order, with one line item for the specified part.
* Creates a new Purchase Orders. Then adds a single line item with a
* quantity of 1, for the specified supplier part.
*
* @ejb.interface-method view-type="remote"
* @ejb.transaction type="Required"
*
* @param supplierPartID The ID of the supplier part.
* @return The ID for the new PurchaseOrder.
*/
public Long newPurchaseOrder( Long supplierPartID ) throws PurchaseOrderDBException, NamingException {
System.out.println("+++++++++++++++ newPurchaseOrder");
long startTime = System.currentTimeMillis();
PurchaseOrderDTO theOrder = new PurchaseOrderDTO();
Session s = null;
Transaction tx = null;
try {
s = openSession();
System.out.println("+++++++++++++++ newPurchaseOrder openSession OK" );
tx = s.beginTransaction();
System.out.println("+++++++++++++++ newPurchaseOrder beginTransaction OK");
When I run this in my Session bean, I always get
Code:
10:38:57,451 ERROR [JTATransaction] Could not find UserTransaction in JNDI
javax.naming.NameNotFoundException: UserTransaction not bound
at org.jnp.server.NamingServer.getBinding(NamingServer.java:495)
at org.jnp.server.NamingServer.getBinding(NamingServer.java:503)
at org.jnp.server.NamingServer.getObject(NamingServer.java:509)
at org.jnp.server.NamingServer.lookup(NamingServer.java:282)
When I call s.beginTransaction()
After much googling the only thread I could find mentioning this error, was because the guy was using HiLo Key gen. Im using postgres sequences.
http://www.mail-archive.com/jboss-user@ ... 23649.htmlIm using Hibernate via JMX
Code:
jboss-service.xml
<server>
<mbean code="net.sf.hibernate.jmx.HibernateService" name="jboss.jca:service=HibernateFactory,
name=HibernateFactory">
<depends>jboss.jca:service=RARDeployer</depends>
<depends>jboss.jca:service=LocalTxCM,name=StarjarCRMDS</depends>
<classpath codebase='.' archives='starjarcrmdb.jar' />
<!-- Make it deploy ONLY after DataSource had been started -->
<attribute name="MapResources">
mappings/PurchaseOrderDTO.hbm.xml
</attribute>
<attribute name="JndiName">java:/hibernate/HibernateFactory</attribute>
<attribute name="Datasource">java:/StarjarCRMDS</attribute>
<attribute name="Dialect">net.sf.hibernate.dialect.PostgreSQLDialect</attribute>
<attribute name="TransactionStrategy">net.sf.hibernate.transaction.JTATransactionFactory</attribute>
<attribute name="TransactionManagerLookupStrategy">net.sf.hibernate.transaction.JBossTransactionManagerLookup</attribute>
<attribute name="UseOuterJoin">false</attribute>
<attribute name="ShowSql">false</attribute>
<attribute name="UserTransactionName">java:/UserTransaction</attribute>
</mbean>
</server>
Note I've also tried
<attribute name="UserTransactionName">java:comp/UserTransaction</attribute>
which makes no difference.
Am I completely missing the point with Transactions in EJB land, or do I still need to start and commit/rollback transaction as I do in my none ejb app?
Any help is appreciated.
Peter Henderson.
Just in case its needed, The mapping file
Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="com.starjar.crm.database.PurchaseOrderDTO"
table="purchaseorders"
proxy="com.starjar.crm.database.PurchaseOrderDTO"
>
<id name="ID" column="ID" unsaved-value="null">
<generator class="sequence">
<param name="sequence">purchaseorders_id_seq</param>
</generator>
</id>
<version column="Version" name="Version" type="int" />
<many-to-one name="Company" column="CompanyID" not-null="true"/>
<property name="Status" />
<!-- more fields here -->
</class>
</hibernate-mapping>
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