5:32 a.m.
Transaction problem
I'm updating in bach thousands of independent records.
in a sheduled Seam batch process
I do not want the overhead to start and stop a session for every individual record.
so I prefere the sequence
| /hibernate factory creation
| /get entity manager - session
|
| loop
| begin transaction
| if error ----- something is wrong in my setup
| ....
| process the transaction
| if error ----- role back this transaction but CONTINUE the loop
| else
| flush transactiom
| if error ----- role back this transaction but CONTINUE the loop
| else Comit the transaction and hope it seen in the database right
away
| check for more work to do (often wait for predetermened externam messages
(response time 1-2 sec but sometines connection problems
| if connection problem abort the proces and try the whole lot somewhat
later
| endloop
|
this process runs into many problems:
I use seam 2.0.0.ga quarts as sheduler (works ok)
problem 1: I do not see any updates during the loop (as if the flush doesn't
work)
problem 2: as any rollback occurs, the process is dead and I can not recover any
information any more
implicitely I lose the whole process.
the rollback rolls-back the full loop.
problem 3: i run into session timeouts after exactly 5 minutes and so
lose the transaction at times
hereby losing everything
using seam i switched of Seam transaction controll / but i still suspect
there is a hidden Seam transaction covering all the loops transaction
-problem 1 and problem 2
as documented I needed to shitch off seam transaction management
transaction-management-enabled="false" in components.xml
| ?xml version="1.0" encoding="UTF-8"?>
| <components xmlns="http://jboss.com/products/seam/components"
| xmlns:core="http://jboss.com/products/seam/core"
| xmlns:persistence="http://jboss.com/products/seam/persistence"
| xmlns:drools="http://jboss.com/products/seam/drools"
| xmlns:async="http://jboss.com/products/seam/async"
| xmlns:bpm="http://jboss.com/products/seam/bpm"
| xmlns:security="http://jboss.com/products/seam/security"
| xmlns:mail="http://jboss.com/products/seam/mail"
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xsi:schemaLocation=
| "http://jboss.com/products/seam/core
http://jboss.com/products/seam/core-2.0.xsd
| http://jboss.com/products/seam/persistence
http://jboss.com/products/seam/persistence-2.0.xsd
| http://jboss.com/products/seam/drools
http://jboss.com/products/seam/drools-2.0.xsd
| http://jboss.com/products/seam/bpm
http://jboss.com/products/seam/bpm-2.0.xsd
| http://jboss.com/products/seam/security
http://jboss.com/products/seam/security-2.0.xsd
| http://jboss.com/products/seam/mail
http://jboss.com/products/seam/mail-2.0.xsd
| http://jboss.com/products/seam/components
http://jboss.com/products/seam/components-2.0.xsd">
| <!-- transaction mangement jpa manual <core:init
debug="@debug@" jndi-pattern="@jndiPattern@" />-->
| <core:init debug="@debug@" jndi-pattern="@jndiPattern@"
transaction-management-enabled="false" />
| conversation-timeout="12000000" -->
| <core:manager concurrent-request-timeout="5000000"
| conversation-timeout="200000000"
| conversation-id-parameter="cid"/>
|
| <persistence:managed-persistence-context name="entityManager"
| auto-create="true"
|
persistence-unit-jndi-name="java:/httpscanEntityManagerFactory"/>
|
|
|
|
| <drools:rule-base name="securityRules">
| <drools:rule-files>
| <value>/security.drl</value>
| </drools:rule-files>
| </drools:rule-base>
|
| <security:identity
authenticate-method="#{authenticator.authenticate}"
| security-rules="#{securityRules}"/>
|
| <event type="org.jboss.seam.notLoggedIn">
| <action execute="#{redirect.captureCurrentView}"/>
| </event>
| <event type="org.jboss.seam.postAuthenticate">
| <action execute="#{redirect.returnToCapturedView}"/>
| </event>
| ...
|
i use JTA and create a delegate session sesson=em.delegate
| /hibernate factory creation (allow seam use the JTA EM injection)
| Session ses=ses=(Session) em.getDelegate();//get the session/get entity manager
- session
|
| @transaction
| class....
|
| loop
| if (ses!=null) txn=ses.beginTransaction();//begin transaction
| if error ----- something is wrong in my setup
| ....
| process the transaction
| if error ----- catch (Exception er) {result.returnCode=-1;errcod=er;
| **** String errmsg=er.getClass().getSimpleName() +" err:
"+ er.getMessage();
| if
(errmsg.indexOf("NullPointerException")>-1)
| log.error(env+" nullpointer exception
failed "+ errmsg,er);
| else log.error(env+" begin transaction error
"+ errmsg);
| try {//rollback cover
| if (ses!=null) txn.rollback();
| } catch (Exception erx)
| {errcod=erx;
| String
erxmsg=erx.getClass().getSimpleName() +" err: "+ erx.getMessage();
| log.error(env+" Rollback
transaction failed "+ erxmsg +" From "+ errmsg);
| }
| }
|
|
| else
| if (ses!=null) ses.flush();//flush transactiom
| if error -----catch (Exception er) {result.returnCode=-1;errcod=er;
| String errmsg=er.getClass().getSimpleName() +"
err: "+ er.getMessage();
| if
(errmsg.indexOf("NullPointerException")>-1)
| log.error(env+" nullpointer exception
failed "+ errmsg,er);
| else log.error(env+" flush error "+
errmsg);
| try {//rollback cover
| if (ses!=null) txn.rollback();
| } catch (Exception erx)
| {errcod=erx;
| String
erxmsg=erx.getClass().getSimpleName() +" err: "+ erx.getMessage();
| log.error(env+" Rollback
transaction failed "+ erxmsg +" From "+ errmsg);
| }
| }
| else if (ses!=null) txn.commit();//Comit the transaction and hope it
seen in the database right away
| if error ----- catch (Exception er)
{result.returnCode=-1;errcod=er;
| String errmsg=er.getClass().getSimpleName() +"
err: "+ er.getMessage();
| if
(errmsg.indexOf("NullPointerException")>-1)
| log.error(env+" nullpointer exception
failed "+ errmsg,er);
| else log.error(env+" comit error "+
errmsg);
| try {//rollback cover
| if (ses!=null) txn.rollback();
| } catch (Exception erx)
| {errcod=erx;
| String
erxmsg=erx.getClass().getSimpleName() +" err: "+ erx.getMessage();
| log.error(env+" Rollback
transaction failed "+ erxmsg +" From "+ errmsg);
| }
| }
|
| check for more work to do (often wait for predetermened externam messages
(response time 1-2 sec but sometines connection problems
| if connection problem abort the proces and try the whole lot somewhat
later
| endloop
|
although the error is probably created by a session timeout.
i have no idea how to change the session timeout to more then 5 minutes
| Transaction is not active: tx=TransactionImple < ac, BasicAction:
a0000c8:453:478ddaee:209 status: ActionStatus.ABORTING >; - nested throwable:
(javax.resource.ResourceException: Transaction is not active: tx=TransactionImple < ac,
BasicAction: a0000c8:453:478ddaee:209 status: ActionStatus.ABORTING >)
|
Questions:
1-Why am I not effectifely deacivating (Seam transaction intervention ?)
should be handled since modif of components.xml
-DB not visualy updated by the Flush
2-As a problem of any kind occurs I roll back the last transaction
why is it rolling back the full loop ( dependent on question 1 ?)
3-how do I handle the time out
All help is welcome
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120392#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...