Post Subject : Tutorial on J2EE using JBOSS-4.x, Eclipse-3.x, Lomboz-3.x and
PostgreSQL-8.x on Windows XP
Ref. 1 : Tutorial for building J2EE Applications using JBOSS and ECLIPSE
http://www.tusc.com.au/tutorial/html/chap7.html (Chapter 7 : Message
Driven Bean, Exercise)
Ref. 2 : Tutorial on J2EE using JBOSS, ECLIPSE and Lomboz (Forum on Ref. 1)
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=36910
Ref. 3 : Environment in use ;
- Windows XP SP2
- J2SDK 1.4.2_08
- Eclipse 3.0.2
- JBoss 4.0.2
- Lomboz 3.0.1 + emf-sdo-runtime-2.0.0
- PostgreSQL 8.0.3 (= DefaultDS)
Followings are some notes on Chapter 7 (MDB, Exercise) in Ref. 1
* The notes cover a creation of DeliverItemsBean.
* Task numbers are based on Ref. 1
* No change has been made to the server definition file
(jboss402postgres.server) thus far.
Task 1 : Create DeliverItems MDB under package au.com.tusc.mdb
- On creation of "DeliverItemsBean", check some points before proceeding
further steps.
= make sure the XDoclet section of DeliverItemsBean.java;
:
| * <!-- begin-xdoclet-definition --> * @ejb.bean name="DeliverItems" *
acknowledge-mode="Auto-acknowledge"
| * destination-type="javax.jms.Queue" *
subscription-durability="NonDurable" * transaction-type="Container"
| *
| :
Task 2 : Create an Immutable Value Object named DeliverItem.
: (as per the steps in Ref. 1)
Task 4 : Add class level tags for deployment
Task 5 : Deploy the DeliverItems Bean
- generate EJB classes
- fix deployment descriptions, i.e. "ejb-local-ref" and "ejb/"
- start JBoss with "Run Server" in "Lomboz J2EE View" menu.
- deploy beans
Note : An error on deployment might occur. It states;
00:08:26,344 ERROR [XmlFileLoader] failed to load jboss.xml. There could be a
syntax error.
| org.jboss.deployment.DeploymentException: Error in jboss.xml for Bean
StoreAccess: ejb-local-ref ejb/StoreAccess found in jboss.xml but not in
ejb-jar.xml
= If occured, comment out "ejb/StoreAccess" under "session" tag in jboss.xml
= re-deploy
:
| <ejb-local-ref>
| <ejb-ref-name>ejb/SupplierLocal</ejb-ref-name>
| <jndi-name>SupplierLocal</jndi-name>
| </ejb-local-ref>
| <!--
| <ejb-local-ref>
| <ejb-ref-name>ejb/StoreAccess</ejb-ref-name>
| <jndi-name>StoreAccessBean</jndi-name>
| </ejb-local-ref>
| -->
| <resource-ref>
| <res-ref-name>jdbc/DefaultDS</res-ref-name>
| <jndi-name>java:/DefaultDS</jndi-name>
| </resource-ref>
|
Task 6 : Create a test client name DeliverMDBClient
: (as per the steps in Ref. 1)
Task 8 : Implement testMDBBean
Task 9 : Run the test client and test the bean
- Messages expected in the console are similar as RequestItemsBean, but they
probably show an error as below.
"(javax.ejb.EJBException: Store failed; CausedByException is: ERROR: column
"quantity" is of type integer but expression is of type character varying)"
:
| 22:44:08,517 INFO [STDOUT] Delivering items in store now... :
| 22:44:08,517 INFO [STDOUT] Entering ItemBean.fillStock() with quantity 100
| 22:44:08,517 INFO [STDOUT] Quantity of items after delivery of items 100
| 22:44:08,517 INFO [STDOUT] Leaving ItemBean.fillStock()
| 22:44:08,517 INFO [STDOUT] Entering ItemBean.getItemData()
| 22:44:08,517 INFO [STDOUT] Leaving ItemBean.getItemData()
| 22:44:08,517 INFO [STDOUT] Stock of item after delivery is :{itemID=I4
supplierID=S1 description=CLOCK quantity=100 price=65.0}
| 22:44:08,517 INFO [STDOUT] Entering DeliverItemsBean.onMessage()
| 22:44:08,533 ERROR [StdServerSession] failed to commit/rollback
| org.jboss.tm.JBossRollbackException: Unable to commit,
tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=EX-3000/192, BranchQual=,
localId=192] status=STATUS_NO_TRANSACTION; - nested throwable:
(javax.ejb.EJBException: Store failed; CausedByException is:
| ERROR: column "quantity" is of type integer but expression is of type
character varying)
| at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:344)
| at org.jboss.tm.TxManager.commit(TxManager.java:200)
| :
- Modify "jbosscmp-jdbc.xml" under /MyStoreMgr/META-INF in order to avoid the
error.
= comment out two tags as below.
Note : This is to be considered as a provisional measure only.
:
| <cmp-field>
| <field-name>quantity</field-name>
| <column-name>QUANTITY</column-name>
| <!--
| <jdbc-type>VARCHAR</jdbc-type>
| <sql-type>INTEGER</sql-type>
| -->
| </cmp-field>
| :
- re-deploy beans and run the test client. Results are as follows;
Note : not necessary to re-generate classes.
Looking up the factory
| Looking up the queue
| Creating the connection
| Creating the session
| Creating the sender
| Setting the object in message
| Sending the message
| Shuting down
| Done !
or
23:30:27,553 INFO [STDOUT] Message Driven Bean got message
org.jboss.mq.SpyObjectMessage {
| Header {
| jmsDestination : QUEUE.DelMdbQueue
| jmsDeliveryMode : 2
| jmsExpiration : 0
| jmsPriority : 4
| jmsMessageID : ID:31-11193642275381
| jmsTimeStamp : 1119364227538
| jmsCorrelationID: null
| jmsReplyTo : null
| jmsType : null
| jmsRedelivered : false
| jmsProperties : {}
| jmsPropReadWrite: false
| msgReadOnly : true
| producerClientId: ID:31
| }
| }
| 23:30:27,553 INFO [STDOUT] Entering DeliverItemsBean.onMessage()
| 23:30:27,585 INFO [STDOUT] Entering StoreAccessBean.ejbCreate()
| 23:30:27,616 INFO [STDOUT] Leaving StoreAccessBean.ejbCreate()
| 23:30:27,632 INFO [STDOUT] Entering StoreAccessBean
| 23:30:27,632 INFO [STDOUT] Leaving StoreAccessBean
| 23:30:27,632 INFO [STDOUT] Entering StoreAccessDAOImpl.init()
| 23:30:27,647 INFO [STDOUT] Leaving StoreAccessDAOImpl.init()
| 23:30:27,647 INFO [STDOUT] Entering StoreAccessDAOImpl.loginUser()
| 23:30:27,647 INFO [STDOUT] Userid is U4
| 23:30:27,647 INFO [STDOUT] Leaving StoreAccessDAOImpl.loginUser()
| 23:30:27,647 INFO [STDOUT] Login is sucessful with U4
| 23:30:27,647 INFO [STDOUT] Entering StoreAccessBean.getSupplierData()
| 23:30:27,663 INFO [STDOUT] Entering SupplierBean.getSupplierData()
| 23:30:27,663 INFO [STDOUT] Leaving SupplierBean.getSupplierData()
| 23:30:27,663 INFO [STDOUT] Leaving StoreAccessBean.getSupplierData()
| 23:30:27,678 INFO [STDOUT] Delivering items in store now... :
| 23:30:27,678 INFO [STDOUT] Entering ItemBean.fillStock() with quantity 100
| 23:30:27,678 INFO [STDOUT] Quantity of items after delivery of items 100
| 23:30:27,678 INFO [STDOUT] Leaving ItemBean.fillStock()
| 23:30:27,678 INFO [STDOUT] Entering ItemBean.getItemData()
| 23:30:27,678 INFO [STDOUT] Leaving ItemBean.getItemData()
| 23:30:27,678 INFO [STDOUT] Stock of item after delivery is :{itemID=I4
supplierID=S1 description=CLOCK quantity=100 price=65.0}
| 23:30:27,678 INFO [STDOUT] Entering DeliverItemsBean.onMessage()
Also, the results can be checked in the database table using "pgAdmin III".
= select * from item
==> "I4";"S1";"CLOCK";100;65.00
jbosszone
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