Transaction attributes

why transaction attributes are not present in JDBC ?
EJB 2.0 Specification includes six defined transaction attributes but JDBC does not carry these . Even the latest JDBC spec does not carry these attributes . Why ?

gimbal2 wrote:
YoungWinston wrote:
user575089 wrote:
EJB 2.0 Specification includes six defined transaction attributes but JDBC does not carry these . Even the latest JDBC spec does not carry these attributes . Why ?I don't know, but I suspect that the transaction attributes are only relevant to EJB. JDBC can be used to execute any piece of SQL on a database, and therefore doesn't have any "model" associated with it (although it does allow you to disable auto-commit). I'm no EJB expert, but I''d suspect that it probably does have a transaction model.
WinstonYes, with exactly six transaction attributes. That is because those attributes are not related to JDBC but to container managed transactions; in other words EJB tech.correct. These are available in EJB tech. However,my point was these are evolved because of necessity ... is not it ?

Similar Messages

CMP and Transaction Attribute

Hi All!
I try to play with cmp entity beans. All I try to do is find instance and call one from the methods.
When I use transaction attribute another than "Required", I get exception 25222. Application module creation exception.
If I change attribute to "Required New" then I get error while bean try to UPDATE record.
I can't understand why this update appear on findByPrimaryKey!
Can any body give some information on JBO behavior?
Mike
null

I do one more test and found
UPDATE exception raised when I have foreign key in table. If I use only plain fild evething is ok. If add to entity foreign key field container raise exception when it try to update record.

MDB transaction attributes

Is there a special reason why NotSupported and Required are the only two supported transaction attributes? I understand that MDBs cannot have a client-initiated transaction, but there are other transaction attributes that indicate the same thing.
If an MDB wants to indicate that it should not execute in a transaction, why can't it indicate Never or Supports in addition to NotSupported? In the case of no client-initiated transaction, all three result in the annotated method occuring under no transaction.
If an MDB wants to indicate that it should execute in a transaction, why can't it indicate RequiresNew in addition to Required? Again, in the case of no client-initiated transaction, both result in the annotated method occuring under a transaction.
The Mandatory attribute throws an exception if there is no client-initiated transaction, so clearly that is never appropriate for MDBs. But I am confused as to why the other transaction attributes cannot be used as indicated above.
Please clarify why the specification indicates this about MDB transaction attributes...
Thanks.

When ejb webservice endpoints were introduced in J2EE 1.4 there was no support for
propagation of transaction context over a webservice invocation. Both the JSR 109
spec and the EJB 2.1 spec prohibited the use of MANDATORY on an ejb web
service endpoint since using it was likely a developer error.
In Java EE 5 the restriction against MANDATORY for ejb web service endpoints was removed in the
EJB 3.0 spec. There's still no requirement that transactions be able to flow with web service
invocations but there are some products that support it so the ejb container is no longer
required to throw an exception in that case.
--ken

Transaction attribute

The transaction attribute is set as TX_NOT_SUPPORTED.What happens if the client calls the bean without a transaction in effect?

Nothing.

Transaction Attribute issue in weblogic 8.1

Hi,
I have problem with the transaction attribute of my session bean in Weblogic8.1 and SQLServer. Following is the description.
I have two beans, say SampleBeanOne and SampleBeanTwo. The transaction attribute of SampleBeanOne is "Required" and that of the SampleBeanTwo is "RequiresNew".
In SampleBeanOne i am trying the execute the a batch of insert quires using PreparedStatement.addBach() and PreparedStatement.executBatch() in a loop that runs of 5 times.
Inside the loop i am calling a method in SampleBeanTwo to get the next sequence. In that method i am updating the squence and selecting the new value.
Now the problem i am facing is that when i call the executeBatch() in the PreparedStatement only the final insert statement added to the batch is called and the insert statement added gets vanished.
If i change the transaction attribute of the SampleBeanTwo to "Required" the code is working fine. But i can't do that since the SampleBeanTwo is accessed throught out my application.
The same peace of code is working properly with Websphere5 and SQL server combination.
Kindly help me out in this issue.
Regards

Hi
ThanX for your reply. I raised the issue to the BEA support, they said that the issue is the driver that i am using. It got resolved when i tried with the BEA provided driver. They call it the BEA branded driver for SQL Server.
Regards
Muthu

Can I modify WLI system Bean's transaction attribute --turn on archiver resulting endless exception in log file

hi,erveryone,
one difficult question need help.
Environment: WLS8.1sp2 + WLI8.1sp2 + ORACLE9i + solaris9
when I started archiver manually,just for a while, wli system generated about 40,000 JMS messages in
wli.internal.worklist.timer.queue,and consume the great mass of system resource of Database server,I had to stop these
archive processes immediately to keep other applicaitons which using the same database running normal. I did so by
following steps:
(1) in WLI console, delete wli.internal.worklist.timer.queue;
(2) in WLI console, reconstruct wli.internal.worklist.timer.queue;
(3) restart wli server.
after server was restarted, wli server output endless and repeatly exception to log file ,the typical exception was:
####<May 8, 2005 3:08:26 PM CST> <Info> <EJB> <app01> <jcwliserver> <ExecuteThread: '54' for queue:
'weblogic.kernel.Default'> <<anonymous>> <BEA1-54B26B551CC1A8856F80> <BEA-010049> <EJB Exception in method: remove:
java.sql.SQLException: Transaction rolled back: Unknown reason.
java.sql.SQLException: Transaction rolled back: Unknown reason
     at weblogic.jdbc.jta.DataSource.enlist(DataSource.java:1299)
     at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1250)
     at weblogic.jdbc.jta.DataSource.getConnection(DataSource.java:385)
     at weblogic.jdbc.jta.DataSource.connect(DataSource.java:343)
     at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:305)
     at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getConnection(RDBMSPersistenceManager.java:2247)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_loadGroup0(ListenerBean_1nsp14__WebLogic_CMP_R
DBMS.java:1055)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_setTaskBean_listeners(ListenerBean_1nsp14__Web
Logic_CMP_RDBMS.java:596)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_setTaskBean_listeners(ListenerBean_1nsp14__Web
Logic_CMP_RDBMS.java:584)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.ejbRemove(ListenerBean_1nsp14__WebLogic_CMP_RDBMS.j
ava:2423)
     at weblogic.ejb20.manager.DBManager.remove(DBManager.java:1318)
     at weblogic.ejb20.internal.EntityEJBLocalHome.remove(EntityEJBLocalHome.java:214)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14_LocalHomeImpl.remove(ListenerBean_1nsp14_LocalHomeImpl.java:131)
     at
com.bea.wli.worklist.beans.session.RemoteWorklistManagerBean.removeTaskListeners(RemoteWorklistManagerBean.java:3001)
     at
com.bea.wli.worklist.beans.session.RemoteWorklistManagerBean_us8t1c_EOImpl.removeTaskListeners(RemoteWorklistManagerBean_us8t
1c_EOImpl.java:698)
     at com.bea.wli.worklist.timer.WorklistTimerMDB.processListenerToRemove(WorklistTimerMDB.java:102)
     at com.bea.wli.worklist.timer.WorklistTimerMDB.onMessage(WorklistTimerMDB.java:61)
     at weblogic.ejb20.internal.MDListener.execute(MDListener.java:382)
     at weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:316)
     at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:281)
     at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2596)
     at weblogic.jms.client.JMSSession.execute(JMSSession.java:2516)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
>
####<May 8, 2005 3:08:26 PM CST> <Info> <EJB> <app01> <jcwliserver> <ExecuteThread: '96' for queue:
'weblogic.kernel.Default'> <<anonymous>> <BEA1-54B96B551CC1A8856F80> <BEA-010049> <EJB Exception in method: remove:
javax.ejb.NoSuchEntityException: [EJB:010140]Bean with primary key: '153.22.52.28-17343c7.10243c3c6ec.a51' not found..
javax.ejb.NoSuchEntityException: [EJB:010140]Bean with primary key: '153.22.52.28-17343c7.10243c3c6ec.a51' not found.
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_loadGroup0(ListenerBean_1nsp14__WebLogic_CMP_R
DBMS.java:1165)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_setTaskBean_listeners(ListenerBean_1nsp14__Web
Logic_CMP_RDBMS.java:596)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.__WL_setTaskBean_listeners(ListenerBean_1nsp14__Web
Logic_CMP_RDBMS.java:584)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14__WebLogic_CMP_RDBMS.ejbRemove(ListenerBean_1nsp14__WebLogic_CMP_RDBMS.j
ava:2423)
     at weblogic.ejb20.manager.DBManager.remove(DBManager.java:1318)
     at weblogic.ejb20.internal.EntityEJBLocalHome.remove(EntityEJBLocalHome.java:214)
     at
com.bea.wli.worklist.beans.entity.ListenerBean_1nsp14_LocalHomeImpl.remove(ListenerBean_1nsp14_LocalHomeImpl.java:131)
     at
com.bea.wli.worklist.beans.session.RemoteWorklistManagerBean.removeTaskListeners(RemoteWorklistManagerBean.java:3001)
     at
com.bea.wli.worklist.beans.session.RemoteWorklistManagerBean_us8t1c_EOImpl.removeTaskListeners(RemoteWorklistManagerBean_us8t
1c_EOImpl.java:698)
     at com.bea.wli.worklist.timer.WorklistTimerMDB.processListenerToRemove(WorklistTimerMDB.java:102)
     at com.bea.wli.worklist.timer.WorklistTimerMDB.onMessage(WorklistTimerMDB.java:61)
     at weblogic.ejb20.internal.MDListener.execute(MDListener.java:382)
     at weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:316)
     at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:281)
     at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2596)
     at weblogic.jms.client.JMSSession.execute(JMSSession.java:2516)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
>
The wli server generated log file very quickly ,:it can output 1M bytes log file per second,all logged information
is similar to the <BEA-010049> excetpion metioned above. BEA support engineer suggested me to totally stop the
archive ,I did so,but the server was still ouput the log file like crazy as before and the normal log information are
completely override by <BEA-010049> excetpion.
I checked the EntityEJBs in WLI console :Mywlidomain> Applications> WLI System EJBs> WLI Worklist Persistence$)A#,and
found that in statistics table :
ListenerBean : Pool miss ratio = 99.67%, transaction rollback ration = 99.90%,Destory Bean Ratio = 99.48%(see
attachment)
WorklistTimerMDB: transaction rollback ratio = 99.97%
It seems ListenerBean worked incorrectly.I searched in support.bea.com and found one example which also about server
output endless log file,the author solved this problem by changing Bean's transaction-attribute from 'Required'
to 'RequiresNew' thought he didn't know why it works. I try this method by changing ListenerBean's
transaction-attribute from 'Required' to 'RequiresNew'.
$weblogic_home/integration/lib/wli-ejbs.ear/ejb-jar-generic.xml:
<ejb-name>CommentBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
<container-transaction>
<method>
<ejb-name>ListenerBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>RequiresNew</trans-attribute> -----------the default value is Required,I modified it to
RequiresNew.
</container-transaction>
<container-transaction>
really it works, the log file output resume normal. But there are still some problems:
(1) this exception is still exist:
javax.ejb.NoSuchEntityException: [EJB:010140]Bean with primary key: '153.22.52.28-17343c7.10243c3c6ec.a51' not found.
(2) is this method safe ?(Does "Modify ListenBean's transaction-attribute" impat other parts of wli system?)
(3) after changed the transaction attribute, if turn on archive again, the server output endless exception:
####<Jun 1, 2005 5:14:58 PM CST> <Info> <EJB> <app01> <jcwliserver> <ExecuteThread: '63' for queue:
'weblogic.kernel.Default'> <<anonymous>> <BEA1-2F43890B86B0A8856F80> <BEA-010036> <Exception from ejbStore:
java.sql.SQLException: XA error: XAER_RMERR : A resource manager error has occured in the transaction branch start()
failed on resource 'weblogic.jdbc.jta.DataSource': XAER_RMERR : A resource manager error has occured in the transaction
branch
oracle.jdbc.xa.OracleXAException
     at oracle.jdbc.xa.OracleXAResource.checkError(OracleXAResource.java:1160)
     at oracle.jdbc.xa.client.OracleXAResource.start(OracleXAResource.java:311)
     at weblogic.jdbc.wrapper.VendorXAResource.start(VendorXAResource.java:50)
     at weblogic.jdbc.jta.DataSource.start(DataSource.java:617)
     at weblogic.transaction.internal.XAServerResourceInfo.start(XAServerResourceInfo.java:1075)
     at weblogic.transaction.internal.XAServerResourceInfo.xaStart(XAServerResourceInfo.java:1007)
     at weblogic.transaction.internal.XAServerResourceInfo.enlist(XAServerResourceInfo.java:218)
     at weblogic.transaction.internal.ServerTransactionImpl.enlistResource(ServerTransactionImpl.java:419)
     at weblogic.jdbc.jta.DataSource.enlist(DataSource.java:1287)
     at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1250)
     at weblogic.jdbc.jta.DataSource.getConnection(DataSource.java:385)
     at weblogic.jdbc.jta.DataSource.connect(DataSource.java:343)
     at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:305)
     at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getConnection(RDBMSPersistenceManager.java:2247)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.__WL_store(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:363
6)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.ejbStore(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:3548)
     at weblogic.ejb20.manager.DBManager.beforeCompletion(DBManager.java:927)
     at weblogic.ejb20.internal.TxManager$TxListener.beforeCompletion(TxManager.java:745)
     at weblogic.transaction.internal.ServerSCInfo.callBeforeCompletions(ServerSCInfo.java:1010)
     at weblogic.transaction.internal.ServerSCInfo.startPrePrepareAndChain(ServerSCInfo.java:115)
     at weblogic.transaction.internal.ServerTransactionImpl.localPrePrepareAndChain(ServerTransactionImpl.java:1142)
     at weblogic.transaction.internal.ServerTransactionImpl.globalPrePrepare(ServerTransactionImpl.java:1868)
     at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:250)
     at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:221)
     at weblogic.ejb20.internal.MDListener.execute(MDListener.java:412)
     at weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:316)
     at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:281)
     at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2596)
     at weblogic.jms.client.JMSSession.execute(JMSSession.java:2516)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
java.sql.SQLException: XA error: XAER_RMERR : A resource manager error has occured in the transaction branch start()
failed on resource 'weblogic.jdbc.jta.DataSource': XAER_RMERR : A resource manager error has occured in the transaction
branch
oracle.jdbc.xa.OracleXAException
     at oracle.jdbc.xa.OracleXAResource.checkError(OracleXAResource.java:1160)
     at oracle.jdbc.xa.client.OracleXAResource.start(OracleXAResource.java:311)
     at weblogic.jdbc.wrapper.VendorXAResource.start(VendorXAResource.java:50)
     at weblogic.jdbc.jta.DataSource.start(DataSource.java:617)
     at weblogic.transaction.internal.XAServerResourceInfo.start(XAServerResourceInfo.java:1075)
     at weblogic.transaction.internal.XAServerResourceInfo.xaStart(XAServerResourceInfo.java:1007)
     at weblogic.transaction.internal.XAServerResourceInfo.enlist(XAServerResourceInfo.java:218)
     at weblogic.transaction.internal.ServerTransactionImpl.enlistResource(ServerTransactionImpl.java:419)
     at weblogic.jdbc.jta.DataSource.enlist(DataSource.java:1287)
     at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1250)
     at weblogic.jdbc.jta.DataSource.getConnection(DataSource.java:385)
     at weblogic.jdbc.jta.DataSource.connect(DataSource.java:343)
     at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:305)
     at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getConnection(RDBMSPersistenceManager.java:2247)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.__WL_store(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:363
6)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.ejbStore(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:3548)
     at weblogic.ejb20.manager.DBManager.beforeCompletion(DBManager.java:927)
     at weblogic.ejb20.internal.TxManager$TxListener.beforeCompletion(TxManager.java:745)
     at weblogic.transaction.internal.ServerSCInfo.callBeforeCompletions(ServerSCInfo.java:1010)
     at weblogic.transaction.internal.ServerSCInfo.startPrePrepareAndChain(ServerSCInfo.java:115)
     at weblogic.transaction.internal.ServerTransactionImpl.localPrePrepareAndChain(ServerTransactionImpl.java:1142)
     at weblogic.transaction.internal.ServerTransactionImpl.globalPrePrepare(ServerTransactionImpl.java:1868)
     at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:250)
     at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:221)
     at weblogic.ejb20.internal.MDListener.execute(MDListener.java:412)
     at weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:316)
     at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:281)
     at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2596)
     at weblogic.jms.client.JMSSession.execute(JMSSession.java:2516)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
     at weblogic.jdbc.jta.DataSource.enlist(DataSource.java:1292)
     at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1250)
     at weblogic.jdbc.jta.DataSource.getConnection(DataSource.java:385)
     at weblogic.jdbc.jta.DataSource.connect(DataSource.java:343)
     at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:305)
     at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getConnection(RDBMSPersistenceManager.java:2247)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.__WL_store(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:363
6)
     at
com.bea.wli.worklist.beans.entity.TaskBean_9fxazu__WebLogic_CMP_RDBMS.ejbStore(TaskBean_9fxazu__WebLogic_CMP_RDBMS.java:3548)
     at weblogic.ejb20.manager.DBManager.beforeCompletion(DBManager.java:927)
     at weblogic.ejb20.internal.TxManager$TxListener.beforeCompletion(TxManager.java:745)
     at weblogic.transaction.internal.ServerSCInfo.callBeforeCompletions(ServerSCInfo.java:1010)
     at weblogic.transaction.internal.ServerSCInfo.startPrePrepareAndChain(ServerSCInfo.java:115)
     at weblogic.transaction.internal.ServerTransactionImpl.localPrePrepareAndChain(ServerTransactionImpl.java:1142)
     at weblogic.transaction.internal.ServerTransactionImpl.globalPrePrepare(ServerTransactionImpl.java:1868)
     at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:250)
     at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:221)
     at weblogic.ejb20.internal.MDListener.execute(MDListener.java:412)
     at weblogic.ejb20.internal.MDListener.transactionalOnMessage(MDListener.java:316)
     at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:281)
     at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2596)
     at weblogic.jms.client.JMSSession.execute(JMSSession.java:2516)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
>
How can I solve these problem ? any suggestion is warm welcome.
Thanks in advance.
Great Lou

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Transfer only "Users" and "Settings" – not "Applications" or "Other files." Don't transfer the Guest account, if it was enabled on the old system. Test. If the problem is still there, you have a hardware fault. Take the machine to an Apple Store for diagnosis.
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Can i call Bean managed EJB with transaction attribute Required New

          I am calling a BeanManaged EJB which has a transaction attribute
          set to Required New from a container managed bean. Does it create a new transaction
          other than the Bean managed transaction. Do i really need a required new field
          transaction attribute.All i need is user controlled transaction.Do i need to set
          the transaction aatibute.
          Thanks
          Krish.


Hi Krish,
          The question does not make much sense.
          I would suggest that you set all your tx settings to "Required" unless you
          have a specific reason to do otherwise, and in those few instances that you
          have a specific reason to do otherwise, then change it in just those places.
          Peace,
          Cameron Purdy
          Tangosol Inc.
          << Tangosol Server: How Weblogic applications are customized >>
          << Download now from http://www.tangosol.com/download.jsp >>
          "KRISH" <[email protected]> wrote in message
          news:[email protected]..
          >
          > I am calling a BeanManaged EJB which has a transaction attribute
          > set to Required New from a container managed bean. Does it create a new
          transaction
          > other than the Bean managed transaction. Do i really need a required new
          field
          > transaction attribute.All i need is user controlled transaction.Do i need
          to set
          > the transaction aatibute.
          >
          > Thanks
          >
          > Krish.
          >

Assignment of transaction attributes in ejb-jar.xml

Hi all,
I'm going through the employee example from the book "Java programming in SAP web application server". I have followed the instrucstions to the letter and have triple checked that i did not miss anything.
During the part "Defining Transaction Control", when i go to the "Assembly" tab, choose "Container-transaction" and click add; i get the following error message.
You have to create and reference EJBs first. Afterwards you can choose them here.
Newly created EJBs are referenced automatically in the ejb-jar.xml, in special cases you might have to reference them manually.
Below is a copy of the ejb-jar. Both beans are referenced in the file so i don't really understand the error message!
Thanks for your help.
<?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>
     <description>EJB JAR description</description>
     <display-name>EJB JAR</display-name>
     <enterprise-beans>
          <session>
               <ejb-name>EmployeeServicesBean</ejb-name>
               <home>com.sap.demo.EmployeeServicesHome</home>
               <remote>com.sap.demo.EmployeeServices</remote>
               <local-home>com.sap.demo.EmployeeServicesLocalHome</local-home>
               <local>com.sap.demo.EmployeeServicesLocal</local>
               <ejb-class>com.sap.demo.EmployeeServicesBean</ejb-class>
               <session-type>Stateless</session-type>
               <transaction-type>Container</transaction-type>
               <ejb-local-ref>
                    <ejb-ref-name>ejb/Employee</ejb-ref-name>
                    <ejb-ref-type>Entity</ejb-ref-type>
                    <local-home>com.sap.demo.EmployeeLocalHome</local-home>
                    <local>com.sap.demo.EmployeeLocal</local>
                    <ejb-link>EmployeeEjb.jar#EmployeeBean</ejb-link>
               </ejb-local-ref>
          </session>
          <entity>
               <ejb-name>EmployeeBean</ejb-name>
               <home>com.sap.demo.EmployeeHome</home>
               <remote>com.sap.demo.Employee</remote>
               <local-home>com.sap.demo.EmployeeLocalHome</local-home>
               <local>com.sap.demo.EmployeeLocal</local>
               <ejb-class>com.sap.demo.EmployeeBean</ejb-class>
               <persistence-type>Container</persistence-type>
               <prim-key-class>java.lang.Long</prim-key-class>
               <reentrant>False</reentrant>
               <cmp-version>2.x</cmp-version>
               <abstract-schema-name>EmployeeBean</abstract-schema-name>
               <cmp-field>
                    <field-name>lastname</field-name>
               </cmp-field>
               <cmp-field>
                    <field-name>firstname</field-name>
               </cmp-field>
               <cmp-field>
                    <field-name>id</field-name>
               </cmp-field>
               <cmp-field>
                    <field-name>department</field-name>
               </cmp-field>
               <primkey-field>id</primkey-field>
               <query>
                    <description>Query for getting all employee objects.</description>
                    <query-method>
                         <method-name>findAllEmployees</method-name>
                         <method-params/>
                    </query-method>
                    <ejb-ql>Select object (p) from EmployeeBean p</ejb-ql>
               </query>
          </entity>
     </enterprise-beans>
     <assembly-descriptor/>
</ejb-jar>

I was able to add the transaction attributes manually to the ejb-jar.xml file. below is what the file looks like now for those interested.
<?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>
     <description>EJB JAR description</description>
     <display-name>EJB JAR</display-name>
     <enterprise-beans>
          <session>
               <ejb-name>EmployeeServicesBean</ejb-name>
               <home>com.sap.demo.EmployeeServicesHome</home>
               <remote>com.sap.demo.EmployeeServices</remote>
               <local-home>com.sap.demo.EmployeeServicesLocalHome</local-home>
               <local>com.sap.demo.EmployeeServicesLocal</local>
               <ejb-class>com.sap.demo.EmployeeServicesBean</ejb-class>
               <session-type>Stateless</session-type>
               <transaction-type>Container</transaction-type>
               <ejb-local-ref>
                    <ejb-ref-name>ejb/Employee</ejb-ref-name>
                    <ejb-ref-type>Entity</ejb-ref-type>
                    <local-home>com.sap.demo.EmployeeLocalHome</local-home>
                    <local>com.sap.demo.EmployeeLocal</local>
                    <ejb-link>EmployeeEjb.jar#EmployeeBean</ejb-link>
               </ejb-local-ref>
          </session>
          <entity>
               <ejb-name>EmployeeBean</ejb-name>
               <home>com.sap.demo.EmployeeHome</home>
               <remote>com.sap.demo.Employee</remote>
               <local-home>com.sap.demo.EmployeeLocalHome</local-home>
               <local>com.sap.demo.EmployeeLocal</local>
               <ejb-class>com.sap.demo.EmployeeBean</ejb-class>
               <persistence-type>Container</persistence-type>
               <prim-key-class>java.lang.Long</prim-key-class>
               <reentrant>False</reentrant>
               <cmp-version>2.x</cmp-version>
               <abstract-schema-name>EmployeeBean</abstract-schema-name>
               <cmp-field>
                    <description>
                    </description>
                    <field-name>lastname</field-name>
               </cmp-field>
               <cmp-field>
                    <description>
                    </description>
                    <field-name>firstname</field-name>
               </cmp-field>
               <cmp-field>
                    <description>
                    </description>
                    <field-name>id</field-name>
               </cmp-field>
               <cmp-field>
                    <description>
                    </description>
                    <field-name>department</field-name>
               </cmp-field>
               <primkey-field>id</primkey-field>
               <query>
                    <description>Query to get all employee objects.</description>
                    <query-method>
                         <method-name>findAllEmployees</method-name>
                         <method-params/>
                    </query-method>
                    <ejb-ql>Select object (p) from EmployeeBean p</ejb-ql>
               </query>
          </entity>
     </enterprise-beans>
     <assembly-descriptor>
          <container-transaction>
               <description>container-transaction</description>
               <method>
                    <ejb-name>EmployeeBean</ejb-name>
                    <method-name>*</method-name>
               </method>
               <method>
                    <ejb-name>EmployeeServicesBean</ejb-name>
                    <method-name>*</method-name>
               </method>
               <trans-attribute>Required</trans-attribute>
          </container-transaction>
     </assembly-descriptor>
</ejb-jar>
Thanks

Practical use of transaction attribute

I want to read abt practical use of transaction attribute,any tutorial or any help?

Well the J2EE tutorial explains them:
http://docs.sun.com/app/docs/doc/819-3669/6n5sg7cm3?a=view
What do you mean by practical - a real world example? You can use NotSupported for read operations as no transaction is required, they say it improves performance, but I have never done any investigation into it.
m

JBDC transaction attribute problem.

Hi All,
We have some methods which will make a call to database to bring some data
using SELECT statement. Have set transaction attribute for those methods as NOT SUPPORTED not to open a transaction and lock the table. But, now it is opening a transaction & locking table & rows.
Any idea why it is doing so ?

normally a select statement will not lock the table
unless you are using a PreparedStatement or
CallableStatement class to perform the query. I don't believe this is correct. I don't think either PreparedStatement or CallableStatement automatically lock tables.
If you
are then it should be an expected behavior. if you
are not using any of this classes make sure to check
that you have not lock the table with the statement
connection.setAutoCommit(false);
this
statement usually locks the table whether you are
using a select statement or not. I don't think this is true, either. This tells the Connection where a transaction starts.
But if these are not
the cause then make sure that you close all
connections when the query has finished executing.
that is connection.close();I think the correct way to tell the database manager to lock data is to use "SELECT FOR UPDATE" notation.
%

Transaction attribute in XML deployment descriptor

Hi,
I just want to know the use of transaction attributes like (Required, notSuuport etc..) are in the EJB.
What is Bean managed and container managed transaction.
How we use the transaction attributes in BMP and CMP.
and in similar fashion, the use of the same in Session beans.
..Aman

modification to the above quesion::
There are 5 different beans named as
CMP, BMP, Stateless, Stateful and MDB.
I want to know that which all transactions (CMT or BMT) can be applied for which bean?
I just got some feedback from some ppl that i cant apply BMT for CMP and BMP. if that is true then why???
if i can apply CMT for CMP and BMP then how i will modify the EJB-jar for the
method definitiion for CMP and BMP. I mean to say the method name and parameter definition. as there are only call back methods.
..Aman

Error deploying EJB on weblogic: Unable to set the transaction attribute

Hi,
I'm trying to deploy an application in WL10.3.2 and an error occurred during activation of changes.
Here is the error message from the log file:
<Jun 6, 2011 1:28:27 PM MDT> <Error> <Deployer> <BEA-149205> <Failed to initialize the application 'serverEAR-2' due to error weblogic.application.ModuleException: Exception preparing module: EJBModule(serverEJB-2.8.0.jar)
Unable to deploy EJB: C:\oracle\Middleware\user_projects\domains\base_domain\servers\Server_3\tmp\_WL_user\serverEAR-2\1zw7ao\serverEJB-2.8.0.jar from serverEJB-2.8.0.jar:
Unable to set the transaction attribute for method 'saveActionGroup(EditableActionGroup)' on EJB 'ViewBean'. No matching method could be found. Please verify the method signature specified in the ejb-jar.xml file matches that of your Remote interface for this EJB.
weblogic.application.ModuleException: Exception preparing module: EJBModule(serverEJB-2.8.0.jar)
Unable to deploy EJB: C:\oracle\Middleware\user_projects\domains\base_domain\servers\Server_3\tmp\_WL_user\serverEAR-2\1zw7ao\serverEJB-2.8.0.jar from serverEJB-2.8.0.jar:
Unable to set the transaction attribute for method 'saveActionGroup(EditableActionGroup)' on EJB 'ViewBean'. No matching method could be found. Please verify the method signature specified in the ejb-jar.xml file matches that of your Remote interface for this EJB.
     at weblogic.ejb.container.deployer.EJBModule.prepare(EJBModule.java:454)
     at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:199)
     at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:391)
     at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:83)
     at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:59)
     Truncated. see log file for complete stacktrace
Caused By: weblogic.ejb.container.deployer.DeploymentDescriptorException: Unable to set the transaction attribute for method 'saveActionGroup(EditableActionGroup)' on EJB 'ViewBean'. No matching method could be found. Please verify the method signature specified in the ejb-jar.xml file matches that of your Remote interface for this EJB.
     at weblogic.ejb.container.deployer.MBeanDeploymentInfoImpl.processCTs(MBeanDeploymentInfoImpl.java:1502)
     at weblogic.ejb.container.deployer.MBeanDeploymentInfoImpl.processSpecificMethodCTs(MBeanDeploymentInfoImpl.java:1472)
     at weblogic.ejb.container.deployer.MBeanDeploymentInfoImpl.initializeTransactionAttribute(MBeanDeploymentInfoImpl.java:773)
     at weblogic.ejb.container.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfoImpl.java:259)
     at weblogic.ejb.container.deployer.EJBDeployer.prepare(EJBDeployer.java:1190)
     Truncated. see log file for complete stacktrace
Please help me...Thanks.

In your ejb-jar.xml you are referring to a method saveActionGroup(EditableActionGroup) which is not defined in your remote interface.
Maybe you have made some typo in the configuration. Check your transaction section, i.e.,
<container-transaction>
            <method>
                <ejb-name>ViewBean</ejb-name>
                <method-name>saveActionGroup</method-name>
                <method-params>
                    <method-param>package.EditableActionGroup</method-param>
                </method-params>
            </method>
            <trans-attribute>Required</trans-attribute>
</container-transaction>or something similar. See if the defined methods are corresponding to the methods defined in the remote interface.

CMT - Transaction Attribute

Hi,
I have a stateless session bean with Container Managed Transaction (CMT) performs DB2 database operation using DAO pattern.The DAO calls DB2 stored procedure.
Commit statements have been used in the stored procedure.No rollback statements have been used in stored procedure.
My question is what would be the appropriate transaction attribute to set for the bean methods?
Is it Supports or Required? I read in IBM site that Supports must be used with caution.
Thanks in advanced.

Tom, you say that "any particular subscription will support only a single consumer" - I don't quite understand how this fits with the max-beans-in-pool setting for an MDB. Are you saying that for CMT MDBs, there is only ever 1 active bean in the pool regardless of what I set max-beans-in-pool to be?Yes, and only one pool at a time will be able to access the subscription. A durable subscription can only be accessed by a connection with a client-id that matches the subscription's client-id, and a DurableSubscriber consumer created from said sonnection that has the same subscriber name. MDBs use a vanilla javax.jms.TopicSubscriber to consume from topic subscriptions, and are designed to assume that the JMS provider adheres to the JMS specification for this API. The JMS specification states (1) only one connection should be able to use a pariticular connection client-id (optional - depends on vendor), and (2) that a subscription must only support a single javax.jms.Consumer (not optional).
Also, does this restriction apply to CMT MDBs regardless of their transaction attribute ie. even if I set transaction-attribute NOT_SUPPORTED?The documentation recommends restricting non-TX MDBs that consume from foreign topics so that they are single threaded. In not-supported tx mode, with foreign vendors, a single connection and single subscriber is still created for a particular pool, as per above, but multiple threads are created to process the single subscriber's messages in parallel. This mode is not safe in that it is possible to lose messages in the event of a crash or application-forced redeliveries (the message may not be redelivered). The problem doesn't apply to MDBs that consume from WebLogic Topics.
Hope this helps,
Tom

Issue with Transaction Attribute

Hi All
I am trying to build a program that will interact with two database at the same time.Lets say, I am getting/updating/inserting data from/to Database1.table1 so I am creating transaction attribute for the same to commit and roll back the changes.
Now, after the above scenario I need to update my audit trail table in database2 but since I have already created transaction for the above database it not allowing me to connect to database2 saying "Connection already exit for database1 cannot create new transaction for Database2".
Also if I tried to create a new transaction for Database2 its passing me exception saying "A transaction is already running for the thread cannot create new transaction for the same thread".
I tried calling a new thread also but the exception remains as the new thread is called from the main thread.
Please help me in same so that i can create two transaction or connection to two database using same transaction.

user12882304 wrote:
... connection to two database using same transaction.Not possible.
You are attempting something with a JDBC driver that the driver does not support.
Your first step is to research distributed transactions.
For this to actually work the database itself must support it. And you must use the correct idiom to invoke it.

EJB 2 : Query in understanding Transaction Attribute NotSupported

NotSupported
The Container invokes an enterprise Bean method whose transaction attribute is set to NotSupported with an unspecified transaction context.
I am having a query in understanding the above thing .Please let me know what does above mean and also what transaction context mean in the below :
If a client calls with a transaction context, the container SUSPENDS the association of the transaction context with the current thread before invoking the enterprise bean's business method.
Thanks in advance .
Waiting for your replies .

it means that the method must operate outside of an active transaction - in other words there will be no active transaction during its runtime. If there is an active transaction when the method is called, that transaction is "put on hold" until the "notsupported" EJB call finishes.

Transaction attributes

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