my environment is websphere 5.1+struts+hibernate 3.1. I would like to use only getCurrentSession function in CMT. (no transaction and session closing)
For this i should configure following parameters in hibernate.cfg.xml

<property name="hibernate.transaction.flush_before_completion">true</property>
<property name="hibernate.transaction.auto_close_session">true</property>

And i would like to ask if someone could explain me what should be in following properties
transaction.factory_class, transaction.manager_lookup_class

if i set it to
<property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
<property name="transaction.manager_lookup_class">org.hibernate.transaction.WebSphereTransactionManagerLookup</property>

what i understand than JTATransationFactory is more generous than CMPTransactionFactory
i got in getCurrentSession() -> org.hibernate.HibernateException: Unable to locate current JTA transaction

when is use it without these parameters, and use getCurrentSession i got
"org.hibernate.HibernateException: No CurrentSessionContext configured!"
but i am able to get session using openSession but then i have to use session.beginTransaction to update my data

I miss something but don't see the key

enclosed hibernate.cfg.xml
<session-factory>

<!-- Data Source -->
<property name="connection.datasource">java:comp/env/jdbc/dzos</property>

<!-- Database Settings -->
<property name="default_schema">authadmin</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="show_sql">true</property>

<!-- JDBC Settings -->
<property name="jdbc.use_streams_for_binary">true</property>
<property name="max_fetch_depth">1</property>

<!-- Cache settings -->
<property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>

<!-- Transaction API -->
<property name="hibernate.transaction.flush_before_completion">true</property>
<property name="hibernate.transaction.auto_close_session">true</property>

<!-- Mapping files -->
<mapping resource="org/tesco/dzos/sql/Apcdval.hbm.xml"/>

</session-factory>


[Unable to locate current JTA transaction]: org.hibernate.HibernateException: Unable to locate current JTA transaction
[16.12.05 14:46:39:494 SEC] 2f8a5b4b WebGroup E SRVE0026E: [Servlet Error]-[Unable to locate current JTA transaction]: org.hibernate.HibernateException: Unable to locate current JTA transaction
at org.hibernate.context.JTASessionContext.currentSession(JTASessionContext.java:61)
at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:506)
at org.volsax.struts.HiberUtil.open(HiberUtil.java:84)
at org.tesco.dzos.struts.CdValAction.editA(CdValAction.java:251)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:276)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:196)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:983)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:564)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:439)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)

Answers are there in Hibernate Reference pdf. When to use lookup_class
1) The classname of a TransactionManagerLookup - required
when JVM-level caching is enabled or when
using hilo generator in a JTA environment.
eg. classname.of.TransactionManagerLookup
2) When Hibernate is using
an application server datasource to obtain connections enlisted with JTA
3) Note that you should choose org.hibernate.transaction.JTATransactionFactory in a BMT session bean,
and org.hibernate.transaction.CMTTransactionFactory in a CMT session bean, when you configure Hibernate's
transaction factory. Remember to also set org.hibernate.transaction.manager_lookup_class.

If you are using Websphere, you should be using CMTtransactionFactory and also an extended lookup for Websphere.
"org.hibernate.transaction.WebSphereTransactionManagerLookup for WebSphere
org.hibernate.transaction.WebSphereExtendedJTATransactionLookup for WebSphere 6"

Confgure a datasource connection thru app server and use the same. Transaction management to be left to the app server (in case of CMT)

Take care

i changed configuration file to

<property name="current_session_context_class">thread</property>
<property name="hibernate.transaction.flush_before_completion">true</property>
<property name="hibernate.transaction.auto_close_session">true</property>
<property name="transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property>
<property name="transaction.manager_lookup_class">org.hibernate.transaction.WebSphereTransactionManagerLookup</property>

but now i am geting "Could not register synchronization"
E SRVE0026E: [Servlet Error]-[Could not register synchronization]: org.hibernate.TransactionException: Could not register synchronization
at org.hibernate.transaction.CMTTransaction.registerSynchronization(CMTTransaction.java:159)
at org.hibernate.context.ThreadLocalSessionContext.currentSession(ThreadLocalSessionContext.java:78)
at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:506)

When i use openSession i get over it but every second call generate following exception

org.apache.struts.action.RequestProcessor Unhandled Exception thrown: class org.hibernate.PropertyAccessException
[18.12.05 0:51:56:859 SEČ] 2c280816 WebGroup E SRVE0026E: [Servlet Error]-[exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of org.tesco.dzos.sql.Apcdval.setLang]: org.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of org.tesco.dzos.sql.Apcdval.setLang
at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValuesWithOptimizer(PojoEntityTuplizer.java:215)
at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:185)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3232)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:126)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2150)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:369)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:300)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:146)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1093)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.tesco.dzos.struts.CdValAction.list(CdValAction.java:74)

how it is possible that first call is working and second generate exception.
any ideas ?!

the "org.hibernate.PropertyAccessException" was my fault i had one int value null.

to summarizate in CMT synchronization exception... and when JTATransactionFactory is used I can't use getCurrentSession, and then when i use openSession using hibernateUtils the data are not saved :-(

<property name="hibernate.transaction.flush_before_completion">true</property>
<property name="hibernate.transaction.auto_close_session">true</property>
<property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
<property name="transaction.manager_lookup_class">org.hibernate.transaction.WebSphereTransactionManagerLookup</property>

Session dbf = HiberUtil.open();

Apcdval cd = new Apcdval();
cd.setCd_val(frm.getI("cd_val"));
cd.setTbl_cd(frm.getI("tbl_cd"));
cd.setSdsc(frm.getS("sdsc"));
cd.setLdsc(frm.getS("ldsc"));
cd.setRstat(frm.getI("rstat"));
cd.setLang(frm.getI("lang"));
cd.setRdt(new Date());

log.info("edit apcdval:" + frm.getValues());
dbf.saveOrUpdate(cd);

HiberUtil.close();

any ideas ?

http://hibernate.org/42.html
http://hibernate.org/43.html

i have read the articles...ok ...

I switch on ContainerManged persistence (use this data source in container managed persistence) in Websphere console.

i set
<property name="transaction.manager_lookup_class">org.hibernate.transaction.WebSphereTransactionManagerLookup</property>
<property name="current_session_context_class">jta</property>
<property name="transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property>

or (according reference manual is also possible to use it)
<property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>

and got

org.hibernate.HibernateException: Unable to locate current JTA transaction

which is realy similar to same issue,
http://forum.hibernate.org/viewtopic.php?t=942973

there are couple things which are not clear
- how could i set CMT / BMT...is it only in hibernate.cfg.xml or also switch or something similar on websphere server ?
- there is something about type of transaction, getCurrentSession is not working when type "Supports", "Not Supported". Where i can set this type of transaction.

thanks for your time guys, i realy want to use it in my next project but can't get over