Transaction demarcation with UserTransaction

Hi
Can any one explain, How does UserTransaction used for Bean Managed Transaction works with multiple resource managers and if in this case resources should be enabled for Two phase commit protocol?
Thanks

Java EE requires JTA. It's the JTA implementation in the application server that allows the work performed by multiple resource managers
in a transaction to have ACID properties. At the application level there's nothing special you need to do. It should all just be handled by the container.
From a deployment and server configuration perspective the requirements can differ depending on the implementation so ultimately you'd need to consult your vendor's documentation. Typically the main thing to ensure is that each resource (JDBC datasource, JMS connection factory, etc.) supports the ability to participate in 2-phase commit. For JDBC drivers, this is often designated by configuring an "XA"-capable driver.

Similar Messages

Container-managed / bean-managed transaction demarcation

I am trying to make sure I understand container-managed and bean-managed transaction demarcation and in particular where you have one bean calling another bean. What happens where one of the beans has container-managed transaction demarcation and the other bean-managed transaction demarcation. In fact the initial question to ask is, is this allowed?
Lets use an application scenario to illustrate the issue. The application has a payment transaction. Payments can be received in one of two ways:
1. As a payment at a branch where the individual payment is processed on a client application and resulting in the processing of a single payment transaction.
2. As a batch of payments received from a bank containing, potentially, thousands of payment transactions.
The proposed implementation for this uses two session beans. The first is a Payment session bean that implements the business logic as appropriate calling entity beans to persist the change. The second is a BatchPayment session bean. This processes the batch of payment transactions received from the bank. The BatchPayment reads through the batch of payments from a bank calling the Payment session bean for each payment transaction.
Lets look at the transactional properties of both session beans. In order to support the client application the Payment session bean can implicitly enforce transactional integrity and is therefore set to container-managed transaction demarcation. However the BatchPayment session bean will want to explicitly specify transaction demarcation for performance reasons. The transactional "commit" process is relatively expensive. When processing a large batch of transactions rather than performing a commit after every transaction is processed we want to perform the commit after a number of transactions have been processed. For example, we may decide that after every 100 transactions have been processed we commit. The processing will have a shorter elapsed time as we have not had to perform 99 commit processes. So the BatchPayment session bean will want to explicitly specify its transaction demarcation and will therefore be defined with bean-managed transaction demarcation.
How would this be implemented? A possible solution is:
Payment session bean implemented with container-managed transaction demarcation with transaction scope set to Required.
BatchPayment session bean implemented with bean-managed transaction demarcation with transaction scope set to Required.
When the client application is run it calls the Payment bean and the container-managed transaction demarcation ensures the transactional integrity of that transaction.
When a BatchPayment process is run it explicitly determines the transaction demarcation. Lets say that after every 100 Payment transactions (through 100 calls to the Payment session bean) have been processed the BatchPayment bean issues a commit. In this scenario however we have mixed container-managed and bean-managed transaction demarcation. Hence my original question. Can container-managed and bean-managed transaction demarcation be mixed? If not how is it possible to implement the requirements as described above?
Thanks for any thoughts.
Paul

BatchPayment session bean implemented with bean-managed transaction demarcation with transaction scope set to Required.Didn't quite understand this sentence.... if it's BMT it has no declarative transaction attributes such as "Required"....
Anyway, first of all I'll have to ask, Why at all would you want to commit in the middle of the business method? to get as much through as possible before a potential crash? :-)
Can container-managed and bean-managed transaction demarcation be mixed?Yes, of course. Just remember that the "direction" you are refering to ->
a BMT SB that propagates it's transaction to a method in a CMT SB that is demarcated with "Required" is the simplest case. If it were "reversed", or for that matter any BMT that might be called within an active transaction context must perform logic to manipulate the transaction state. For instance(and most common case), checking to see if a transaction is active and if so not to do anything(just use the one that is already active).
If not how is it possible to implement the requirements as described above?You could also implement this scenario with CMTs all the way through. your BatchPayment SB could consist of two methods, one (say, execute(Collection paymentsToExecute) ) with "Supports", and another(say executeBatchUnit(Collection paymentsToExecute, int beginIndex, int endIndex) ) with "RequiresNew".
then have the first just call the other with indexes denoting each time a group of payments.
Still, it does seem more suitable using BMT for these kind of things.....
Hope this helped....

Entity Bean can only use container-managed transaction demarcation?

In <<Designing Enterprise Application with J2EE 2nd>>
Section 2.3.3.3 Enterprise Bean Transactions,it says:Entity beans can only use container-managed transaction demarcation.
That means,i can not get UserTransaction from EJBContext.
Is that true?

Yes this is the requirement of the specs. Your ejb code generator should give you the error if you use usertransaction.
--Ashwani

MDB container managed transaction demarcation not working in wls 6.1 beta

I have an MDB which sends the messages it receives onto another JMS
          destination within the onMessage method. These messages are not sent to
          the JMS destination unless I explicitly use a transacted session for the
          destination and subsequently commit the session. If I set the transacted
          parameter to Session as false the messages are sent. If I set the
          transacted parameter to true the messages will only be output if the
          session is committed. This is the standard behaviour for a JMS session
          but this is not the correct behaviour for an MDB running with
          container-managed transaction demarcation.
          For a start the transacted parameter to session should be ignored when
          run in the context of a container transaction and the commit method
          should thrown an exception as it is not allowed within the context of a
          container transaction.
          This is the MDB code and the deployment descriptor: -
          public class MessageBean implements MessageDrivenBean, MessageListener
          private String topicName = null;
          private TopicConnectionFactory topicConnectionFactory = null;
          private TopicConnection topicConnection = null;
          private TopicSession topicSession = null;
          private Topic topic = null;
          private TopicPublisher topicPublisher = null;
          private TextMessage textMessage=null;
          private transient MessageDrivenContext messageDrivenContext = null;
          private Context jndiContext;
          public final static String
          JMS_FACTORY="weblogic.examples.jms.TopicConnectionFactory";
          public final static String
          TOPIC="weblogic.examples.jms.exampleTopic";
          public MessageBean()
          public void setMessageDrivenContext(MessageDrivenContext
          messageDrivenContext)
          this.messageDrivenContext = messageDrivenContext;
          public void ejbCreate()
          public void onMessage(Message inMessage)
          try
          jndiContext = new InitialContext();
          topicConnectionFactory =
          (TopicConnectionFactory)jndiContext.lookup(JMS_FACTORY);
          topic = (Topic) jndiContext.lookup(TOPIC);
          topicConnection =
          topicConnectionFactory.createTopicConnection();
          topicConnection.start();
          // The transacted parameter should be ignored in the context of a
          container tx
          topicSession = topicConnection.createTopicSession(true,
          Session.AUTO_ACKNOWLEDGE);
          topicPublisher = topicSession.createPublisher(topic);
          textMessage = (TextMessage)inMessage;
          topicPublisher.publish(inMessage);
          // this is illegal in a container transaction
          topicSession.commit();
          topicConnection.close();
          catch (JMSException je)
          throw new EJBException(je);
          catch (NamingException ne)
          throw new EJBException(ne);
          public void ejbRemove()
          <?xml version="1.0" encoding="UTF-8"?>
          <!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise
          JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
          <ejb-jar>
          <enterprise-beans>
          <message-driven>
          <display-name>MessageBean</display-name>
          <ejb-name>MessageBean</ejb-name>
          <ejb-class>MessageBean</ejb-class>
          <transaction-type>Container</transaction-type>
          <message-driven-destination>
          <destination-type>javax.jms.Queue</destination-type>
          </message-driven-destination>
          <security-identity>
          <description></description>
          <run-as>
          <description></description>
          <role-name></role-name>
          </run-as>
          </security-identity>
          </message-driven>
          </enterprise-beans>
          <assembly-descriptor>
          <container-transaction>
          <method>
          <ejb-name>MessageBean</ejb-name>
          <method-name>*</method-name>
          </method>
          <trans-attribute>Required</trans-attribute>
          </container-transaction>
          </assembly-descriptor>
          </ejb-jar>


Please see the response in the EJB newsgroup.
          Also, could you kindly only post to a single newsgroup?
          Thanks.
          "Jimmy Johns" <[email protected]> wrote in message
          news:[email protected]...
          > I have an MDB which sends the messages it receives onto another JMS
          > destination within the onMessage method. These messages are not sent to
          > the JMS destination unless I explicitly use a transacted session for the
          >
          > destination and subsequently commit the session. If I set the transacted
          >
          > parameter to Session as false the messages are sent. If I set the
          > transacted parameter to true the messages will only be output if the
          > session is committed. This is the standard behaviour for a JMS session
          > but this is not the correct behaviour for an MDB running with
          > container-managed transaction demarcation.
          >
          > For a start the transacted parameter to session should be ignored when
          > run in the context of a container transaction and the commit method
          > should thrown an exception as it is not allowed within the context of a
          > container transaction.
          >
          > This is the MDB code and the deployment descriptor: -
          >
          > public class MessageBean implements MessageDrivenBean, MessageListener
          > {
          > private String topicName = null;
          > private TopicConnectionFactory topicConnectionFactory = null;
          > private TopicConnection topicConnection = null;
          > private TopicSession topicSession = null;
          > private Topic topic = null;
          > private TopicPublisher topicPublisher = null;
          > private TextMessage textMessage=null;
          > private transient MessageDrivenContext messageDrivenContext = null;
          >
          > private Context jndiContext;
          >
          > public final static String
          > JMS_FACTORY="weblogic.examples.jms.TopicConnectionFactory";
          > public final static String
          > TOPIC="weblogic.examples.jms.exampleTopic";
          >
          > public MessageBean()
          > {
          > }
          >
          > public void setMessageDrivenContext(MessageDrivenContext
          > messageDrivenContext)
          > {
          > this.messageDrivenContext = messageDrivenContext;
          > }
          >
          > public void ejbCreate()
          > {
          > }
          >
          > public void onMessage(Message inMessage)
          > {
          > try
          > {
          > jndiContext = new InitialContext();
          > topicConnectionFactory =
          > (TopicConnectionFactory)jndiContext.lookup(JMS_FACTORY);
          > topic = (Topic) jndiContext.lookup(TOPIC);
          > topicConnection =
          > topicConnectionFactory.createTopicConnection();
          > topicConnection.start();
          > // The transacted parameter should be ignored in the context of a
          > container tx
          > topicSession = topicConnection.createTopicSession(true,
          > Session.AUTO_ACKNOWLEDGE);
          > topicPublisher = topicSession.createPublisher(topic);
          > textMessage = (TextMessage)inMessage;
          > topicPublisher.publish(inMessage);
          > // this is illegal in a container transaction
          > topicSession.commit();
          > topicConnection.close();
          > }
          > catch (JMSException je)
          > {
          > throw new EJBException(je);
          > }
          > catch (NamingException ne)
          > {
          > throw new EJBException(ne);
          > }
          > }
          >
          > public void ejbRemove()
          > {
          > }
          > }
          >
          >
          >
          >
          > <?xml version="1.0" encoding="UTF-8"?>
          >
          > <!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise
          > JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
          >
          > <ejb-jar>
          > <enterprise-beans>
          > <message-driven>
          > <display-name>MessageBean</display-name>
          > <ejb-name>MessageBean</ejb-name>
          > <ejb-class>MessageBean</ejb-class>
          > <transaction-type>Container</transaction-type>
          > <message-driven-destination>
          > <destination-type>javax.jms.Queue</destination-type>
          > </message-driven-destination>
          > <security-identity>
          > <description></description>
          > <run-as>
          > <description></description>
          > <role-name></role-name>
          > </run-as>
          > </security-identity>
          > </message-driven>
          > </enterprise-beans>
          > <assembly-descriptor>
          > <container-transaction>
          > <method>
          > <ejb-name>MessageBean</ejb-name>
          > <method-name>*</method-name>
          > </method>
          > <trans-attribute>Required</trans-attribute>
          > </container-transaction>
          > </assembly-descriptor>
          > </ejb-jar>
          >
          >
          >
          >
          >
          >
          >
          >

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The transaction associated with the current connection has completed but has not been disposed. The transaction must be disposed before the connection can be used to execute SQL statements.

Hello All,
I am getting below error can you please help me
Error:-
The transaction associated with the current connection has completed but has not been disposed. The transaction must be disposed before the connection can be used to execute SQL statements.

Perhaps this thread will help you out
http://stackoverflow.com/questions/11453066/error-the-transaction-associated-with-the-current-connection-has-completed-but
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Best regards
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Transaction Demarcation Error

Hi,
I have written entity bean and tried to verify it in J2EE 1.4 SDK in Deploytool.
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</container-transaction>

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Transaction demarcation with UserTransaction

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