UserTransaction

Hi everybody,
          I have a question, hope somebody can help me!
          I have stateless bean and performing following operations:
          1. Start UserTransaction
          2. Creating record in sybase table by calling CMP bean.
          3. Creating JDBC connection using JNDI lookup / Datasource ( Sybase)
          4. Creating temp table in Sybase
          5. Calling stored procedure.( with out and in param)
          6. Commit transaction:
          7. If any of the above fails rollback.
          For some reason Stored procedure is always returning error.
          If the same stored procedure is executed outside the transaction it executes
          fine.
          Any help will be appreciated!!!
          SCH

reZer wrote:
A short question regarding use of static when declaring a usertransaction variable, i have seen use of this
Private static UserTransaction ut = null;
If two users accsess the class at the same time, vold it be that one is overwriting the other?
Or is usertransaction threadaware, so no conflicts occure?If you use a static field then all instances of your object will use the same UserTransaction instance.
Is this a EJB? The idea of EJBs being "thread-safe" means that each instance will be used by only one thread at a time. However if you have more than one instance (which is likely), then these might be used by different threads at the same time, and since UserTransaction is static they will all be using the same static UserTransaction object.
Why do you think it needs to be static? Are you really trying to share the same transaction between multiple instances?
Nigel

Similar Messages

How to get the UserTransaction object in stateless session bean

Hi, I am using jboss server and jdk5 version and using EJB.
My Application flow :
JSP à Action(Struts) à Service Locator à Session bean à Entity Bean(cmp) à DB.
I tried to get the UserTransaction object in my Action. Its my code.
InitialContext ctx = new InitialContext();
UserTransaction uTrans = (UserTransaction) ctx.lookup("java:comp/UserTransaction");
After used uTrans.begin(),uTrans.commit() and uTrans. rollback () also.
Its working fine .
But, I used the the same code inside in my session bean its not working.
Stateless Session Manager Bean code :
public class SampleManagerBean implements SessionBean {
public void ejbCreate() throws CreateException { }
public void ejbRemove() { }
public void ejbActivate() {   }
public void ejbPassivate() {   }
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
     public void createSample() throws EJBException
     try{
               InitialContext ctx = new InitialContext();
               UserTransaction ut = (UserTransaction) ctx.lookup("java:comp/UserTransaction");
          }catch(Exception e) {
          System.out.println( Exception === > +e)
Its throws the error ie: javax.naming.NameNotFoundException: UserTransaction not bound
How to get the UserTransaction object in my session bean. Kindly give solution the above errors.
- Thendral

first of all, you could just use sessionContext.getUserTransaction(). however, that would only work if your bean is using bean-managed transactions. the default is container-managed transaction, in which case you cannot get a UserTransaction object. if you want to manage transactions, you need to add the TransactionManagementType.BEAN annotation to your ejb.

Can I use UserTransaction within a CMP Session bean?

Basically the problem is as follow:
I have the following method in a Statefull session bean:
public Whatever do()
processSomething();
notify();
the notify() basically notifying the client that then query for the something that was processed in the processSomething() method.
THE PROBLEM is that the changes have not been committed yet as the do() method is not finished yet and the container has not committed the changes.
THE QUESTION is - can I use UserTransaction inside
processSomething to commit the changes and leave the bean as CMP? I want to leave it as CMP as there are more methods on the bean and I don't want to have to manage the transactions for them.
Anyone has any other ideas?
Thanks in advanced.

Hi again,
The EJB specs say that a stateful Session Bean with CMT is NOT allowed to use the UserTransaction; see page 361 of the EJB2.0 specification. So combining them will not (or should not) work.
I suggest CMT+SessionSynchronization combined with using a flag to indicate whether notify should be called or not. Otherwise, you could try splitting up the bean into two beans: one with CMT and another one without. The one without CMT could use the UserTransaction and notify.
Also, you might want to check http://www.onjava.com/pub/a/onjava/2001/10/02/ejb.html
Hope that helps a bit,
Guy
http://www.atomikos.com

How to use UserTransaction in non-EJB code

This is in a class that is called from within a Stateless Session bean. In this class, I'm trying to use a UserTransaction object that is created as follows (taken from Zuffoletto's book):
========================================
env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
ctx = new InitialContext(env);
tx = (UserTransaction) ctx.lookup("javax.transaction.UserTransaction");
========================================
However, when I call tx.begin(), it throws an exception as follows:
========================================
javax.transaction.NotSupportedException: Another transaction is associated with this thread. Existing transaction Name=[EJB com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke
(com.bea.wlw.runtime.core.request.Request)],Xid=BEA1-001123C02690(16658514),Status=Ac
tive,numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds since begin=13,seconds left=43187,activeThread=Thread[ExecuteThread: '12' for
queue: 'weblogic.kernel.Default',5,Thread Group for Queue: 'weblogic.kernel.Default'],SCInfo[workshop+cgServer]=
(state=active),properties=({weblogic.transaction.name=
[EJB com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke
(com.bea.wlw.runtime.core.request.Request)]}),OwnerTransactionManager=ServerTM[ServerCoordinatorDescriptor=
(CoordinatorURL=cgServer+192.168.0.73:7001+workshop+t3+, XAResources={},NonXAResources={})])
========================================
Any ideas/suggestions/hints??
Why would this explicitly created tx, being used by one single call be colliding with an existing transaction?
Thanks for your comments.

Hello,
As I understand, you would like to setup a watch folder which will be getting pdf files in arbitrary intervals. You then want each pdf to be converted to ps in a separate folder.
You could achieve this with the help of a script by polling for pdf files present in the watch folder. When you find pdf files, convert them to ps, save the ps file in another folder and then move the pdf to another folder.
In any case, once the process of conversion of pdf to ps is over, acroread will quit.
There is no way to keep the acroread process running in background and convert pdfs as and when they are available.
Please let me know if this answers your query.
Regards,
Rishi

Setting Isolation level of UserTransaction Object

can we set the Isolation level of the UserTransaction in case of bean managed transaction or in case where we are handeling transaction in servlets (I am trying to do it in servlets by geting Javax.Transaction.UserTransaction through JNDI in weblogic). UserTransaction only have few methods and none of them is to set the Isolation level. so where would be the seting or its not possible which I think should not be the case
Thanks

Hi,
The UserTransaction is not the right place to set the isolation level, because then it would be the same setting
for all data sources you access in that transaction.
Rather, you can set the isolation level in each connection you make. That way, you can choose a different setting for each one.
Best,
Guy
Guy Pardon ( [email protected] )
Atomikos Software Technology: Transactioning the Net
http://www.atomikos.com/

Setting Isolation Level In A UserTransaction

We are having a problem where a class creates a UserTransaction from the InitialContext,
but does not see any database changes made by other EJBs even though they have
been committed. This "seems" like an isolation issue.
What is the default isolation level for UserTransaction? And since it appears
that it is not seeing committed data, what level should it be set to? (i.e. TRANSACTION_READ_COMMITTED
would be nice...)

this is mirrored from the transaction newsgroup:
Joseph Weinstein <[email protected]> wrote:
>
>
Interesting, but it's not an isolation level issue. There is no DBMS
isolation level
that could cause a user not to see already-committed data.Well, we are using Oracle as our backend and it supports Read Uncommitted, Read
Committed and Serializable. The Serializable option would prevent a transaction
from seeing any committed data to a table (i.e. prevents unrepeatable reads).
The default isolation level of most DBMSes is READ_COMMITTED, and you
should
never have to change it, and you should be able to see already-committed
data.I agree, but that is not happening for us (and this gets somewhat complicated
with JMS). What is Weblogic 8.1's default isolation level for any transaction.
From the link below, I get the impression it is SERIALIZABLE which would explain
the behaviour I'm seeing. Athough the article seems to be talking about CMT (container
transation), I would suspect a BMT (bean managed transaction) be similar (just
manual).
If this only confuses things, please let me know the easiest way to communicate
this issue (code, etc..)
http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=article&group=weblogic.developer.interest.transaction&item=227&utag
(from the article)
Subject: Re: What is ths default transaction isolation level
Date: Mon, 12 Feb 2001 15:27:24 -0500
From: "Cameron Purdy" <[email protected]>
Organization: BEA SYSTEMS Inc
Newsgroup: weblogic.developer.interest.transaction
serializable
-- Cameron Purdy Tangosol, Inc. http://www.tangosol.com +1.617.623.5782 WebLogic
Consulting Available
"mrityunjay" <[email protected]> wrote in message news:3a86c781$[email protected]..
Hi , > If transaction isolation , for a EJB is not specified what is the > defaulttransaction isolation level > Thanks > Jay > >

How to get a connection which does not participate in the main usertransaction

          Hi All I am on WLS 6.1 sp2 on win2k. I have a requirement which is like this: I
          use connection pools/txdatasources/JTA in my application. Now when a JTA transaction
          (UserTransaction) is active - I want to take a connection from the pool and do
          some operation and commit it independently of the UserTransction commit/rollback.
          Its pretty much like this - 3 components A , B, C (none of them are EJBs) are
          involved in a UserTransactions and all of them access database via a TxDataSource
          (say TD) which points to a connectionpool (say CP). Now I want B to get a connection
          handle which is not participating in the main transaction - so that the operation
          that B does is independent of what happens to the main transaction. Now I know
          I can use TransactionManager api to suspend a UserTransaction and then let B take
          a connection from the pool and commit it and then resume the transaction. But
          is there any easier way out of it? Like if B uses a DataSource instead of a TXDataSource
          - will that give B a connection which is not part of the main transaction? if
          not then whats the difference between DataSource and TXDataSource? Any help is
          appreciated.
          thanks
          Anamitra


I would recommend that you mark the method as NotSupported or
          RequiresNew rather than using DataSource or suspending/resuming
          transactions on your own.
          If anything, it will be much clearer to the next person who maintains
          your code.
          -- Rob
          Anamitra wrote:
          > Hi All I am on WLS 6.1 sp2 on win2k. I have a requirement which is like this: I
          > use connection pools/txdatasources/JTA in my application. Now when a JTA transaction
          > (UserTransaction) is active - I want to take a connection from the pool and do
          > some operation and commit it independently of the UserTransction commit/rollback.
          >
          >
          >
          > Its pretty much like this - 3 components A , B, C (none of them are EJBs) are
          > involved in a UserTransactions and all of them access database via a TxDataSource
          > (say TD) which points to a connectionpool (say CP). Now I want B to get a connection
          > handle which is not participating in the main transaction - so that the operation
          > that B does is independent of what happens to the main transaction. Now I know
          > I can use TransactionManager api to suspend a UserTransaction and then let B take
          > a connection from the pool and commit it and then resume the transaction. But
          > is there any easier way out of it? Like if B uses a DataSource instead of a TXDataSource
          > - will that give B a connection which is not part of the main transaction? if
          > not then whats the difference between DataSource and TXDataSource? Any help is
          > appreciated.
          > thanks
          > Anamitra

UserTransaction error Message

          I used to UserTransaction with Stateful Session Bean.
          I obtained to UserTransaction object in client applications with folow next :
          Context jndiTran = new InitialContext();
          UserTransaction userTran = (UserTransaction)jndiTran.lookup("java:comp/UserTransaction");
          userTran.begin();
          but, I discovered to error message with follow next :
          I want to know why NullPointException was thrown and how to way it.
          thank you.
          "java.lang.NullPointerException
          at weblogic.jndi.factories.java.ReadOnlyContextWrapper.lookup(ReadOnlyCo
          ntextWrapper.java:29)
          at weblogic.jndi.internal.AbstractURLContext.lookup(AbstractURLContext.j
          ava:117)
          at javax.naming.InitialContext.lookup(InitialContext.java:350)
          at jsp_servlet._work_flow._cabin_insert_sf._jspService(_cabin_insert_sf.
          java:99)
          at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
          at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
          pl.java:106)
          at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
          textImpl.java:907)
          at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
          textImpl.java:851)
          at weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
          ContextManager.java:252)
          at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
          a:364)
          at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:252)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)"


That looks like a bug. Please report it to [email protected]. Also, make sure that you are
          running the latest service pack. (It may already be fixed.)
          I suspect that if you lookup "javax.transaction.UserTransaction" that it will work fine.
          -- Rob
          "Kyoung hee, Kim" wrote:
          > I used to UserTransaction with Stateful Session Bean.
          > I obtained to UserTransaction object in client applications with folow next :
          > ..
          > Context jndiTran = new InitialContext();
          > UserTransaction userTran = (UserTransaction)jndiTran.lookup("java:comp/UserTransaction");
          > userTran.begin();
          > ..
          >
          > but, I discovered to error message with follow next :
          > I want to know why NullPointException was thrown and how to way it.
          > thank you.
          >
          > "java.lang.NullPointerException
          > at weblogic.jndi.factories.java.ReadOnlyContextWrapper.lookup(ReadOnlyCo
          > ntextWrapper.java:29)
          > at weblogic.jndi.internal.AbstractURLContext.lookup(AbstractURLContext.j
          > ava:117)
          > at javax.naming.InitialContext.lookup(InitialContext.java:350)
          > at jsp_servlet._work_flow._cabin_insert_sf._jspService(_cabin_insert_sf.
          > java:99)
          > at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
          > at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
          > pl.java:106)
          > at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
          > textImpl.java:907)
          > at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
          > textImpl.java:851)
          > at weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
          > ContextManager.java:252)
          > at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
          > a:364)
          > at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:252)
          >
          > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)"

Losing UserTransaction state in Stateful session bean

I have a UserTransaction I wish to begin and commit in different methods of a Stateful session bean. I have 2 methods to test this on the session bean:
public void beginTransaction()
trans = context.getUserTransaction() ;
trans.begin() ;
public void commitTransaction()
trans = context.getUserTransaction() ;
trans.commit() ;
If I call these methods from one Perform method in a Struts action all works fine. If I call the methods in different Struts actions (storing the session bean handle on the HTTPSession in the first for retrieval in the second) the second call fails with the following exception:
java.lang.IllegalStateException: No active Transaction
The state of the transaction on the second call is STATUS_NO_TRANSACTION. I am certain that I have lost no state on the session bean and that using handles gives me the correct bean since I have written some state to test this. Basically something seems to close the transaction between the end of the first Perform method and the beginning of the second (I am of course assuming this is a valid thing to do).
My session bean descriptor has <transaction-type>Bean</transaction-type>, and I am using OC4J.
If anyone can point out what it is I am doing wrong I would be grateful!
James.

Sorry, I have re-checked my code and I believe I found the problem.
I was beginning my transaction inside ejbCreate() and trying to commit/rollback in another method. This works in JBoss 3.2 but does not work in either OC4J or WebLogic 7.
If I begin my transaction in a business method and commit/rollback in another method, everything works fine. (It also seems to work fine in 9.0.3 this way).
So I am not sure whether this is a bug in 9iAS/WLS, or a bug in JBoss, or something that is left "vague" in the J2EE spec. Unfortunately, examples on bean-managed transactions are thin on the ground generally (the usual advice being not to use them, which I definitely agree with!).
If you believe that the behaviour I describe is a bug in 9iAS, I can send a simple EJB test case.
Keith

[JSP] UserTransaction cannot be resolved to a type

I have a JSP page that uses the UserTransaction type, but iam getting an error:
UserTransaction cannot be resolved to a typeI have imported UserTransaction using this code:
<%@ page import="java.sql.*,javax.transaction.*" %>Is there a separate Jar for UserTransaction that needed to be copied to the classpath?

The implementation is provided by your container so check in your container's jee jar.

UserTransaction or JDBC transaction

Hi,
please give suggestions...
We are using a application server with connection pooling
jsp and servlets are used in project
for transactions Is userTransaction is better or JDBC transaction is better
userTransaction may be implemented like this
try
getUserTransaction
transaction.begin
execute queries
transaction.commit
catch()
transaction.setRollbackOnly
JDBC Transaction may be implemented like this
connection.autoCommit=false
try
execute queries
connection.commit
catch()
connection.rollback
which is better for scalability and performance when we have to use transactins
in jsp/servlets
regards

Hi,
You are talking about using programmatic transactions in J2EE applications.
When developing J2EE applications, you are recommended to use the transaction mechanism provided by the application servers.
Sometimes, JDBC transaction can undertake the whole task. However, using JTA (Java Transaction APIs) is the better choice.
Especially when you are going to develop a lot of components (JavaBeans/ EJBs).
Imangine if a transaction is to be finished after the coroperation of serveral objects(JavaBean/ EJB instances).
How can you control the begining and the ending of the transaction by puting codes in these programs?
But it is very easy to input JTA codes (just like userTransaction etc.) to implement it.
Therefore, to use JTA is more convinient.
Additionally, J2EE specifications recommend to use declarative transactions in EJBs. Thus transaction management could be more flexible.
Good luck.
Gary Wang
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support/

Javax.naming.NameNotFoundException: java:comp/UserTransaction not found

Hi,
trying to obtain UserTransaction from client:
UserTransaction t = (UserTransaction)context.lookup("java:comp/UserTransaction");
but I get this error:
javax.naming.NameNotFoundException: java:comp/UserTransaction not found
at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:164)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
Any help?

The problem has been resolved. It was a usage-related issue. Thank you all.

RollbackException using UserTransaction when calling EJB in separate server

I'm using WL 6.1 on Solaris and am calling a stateless session EJB that
          is running in a separate server. I'm looking up the remote EJB using
          JNDI and calling through it's home interface. This works fine but if
          the client code begins a UserTransaction, then calls the EJB that's in
          the separate server, and then calls commit on the transaction, I get the
          following:
          weblogic.transaction.RollbackException: Aborting prepare because some
          resources could not be assigned - with nested exception:
          [javax.transaction.SystemException: Aborting prepare because some
          resources could not be assigned]
          The code that works looks like:
          rgData =
          HomeHolder.ROUTING_GUIDE_MGR_HOME.create().getResourceOptions(qd);
          whereas the code that fails is:
          UserTransaction transaction = new UserTransaction();
          transaction.begin();
          rgData =
          HomeHolder.ROUTING_GUIDE_MGR_HOME.create().getResourceOptions(qd);
          transaction.commit();
          If I put the EJB in the same server as the client, I don't get the
          exception so it seems to be related to running it in the separate server
          and using the UserTransaction. The deployment descriptor of the EJB
          states that it "Supports" transactions.
          Any ideas?
          Thanks,
          John


Yes, actually we are using:
          AppServerTransaction transaction = new AppServerTransaction();
          which is a wrapper which does what you say:
          Context ctx = new InitialContext(...); // connect to another WLS
          UserTransaction tx = (UserTransaction)ctx.lookup("java:comp/UserTransaction");
          and our HomeHolder does what you say as well:
          Homexxx home = ctx.lookup(...);
          Any ideas why surrounding the EJB call by a UserTransaction causes a problem when
          committing?
          Thanks,
          John
          Dimitri Rakitine wrote:
          > John Hanna <[email protected]> wrote:
          > > I'm using WL 6.1 on Solaris and am calling a stateless session EJB that
          > > is running in a separate server. I'm looking up the remote EJB using
          > > JNDI and calling through it's home interface. This works fine but if
          > > the client code begins a UserTransaction, then calls the EJB that's in
          > > the separate server, and then calls commit on the transaction, I get the
          > > following:
          >
          > > weblogic.transaction.RollbackException: Aborting prepare because some
          > > resources could not be assigned - with nested exception:
          > > [javax.transaction.SystemException: Aborting prepare because some
          > > resources could not be assigned]
          >
          > > The code that works looks like:
          >
          > > rgData =
          > > HomeHolder.ROUTING_GUIDE_MGR_HOME.create().getResourceOptions(qd);
          >
          > > whereas the code that fails is:
          >
          > > UserTransaction transaction = new UserTransaction();
          >
          > It's an interface, how did this work? Assuming that you do not want
          > distributed tx, does this work:
          >
          > Context ctx = new InitialContext(...); // connect to another WLS
          > UserTransaction tx = (UserTransaction)ctx.lookup("java:comp/UserTransaction");
          > Homexxx home = ctx.lookup(...);
          > tx.begin();
          > home.create().getResourceOptions(qd);
          > tx.commit();
          >
          > ?
          >
          > > transaction.begin();
          > > rgData =
          > > HomeHolder.ROUTING_GUIDE_MGR_HOME.create().getResourceOptions(qd);
          > > transaction.commit();
          >
          > > If I put the EJB in the same server as the client, I don't get the
          > > exception so it seems to be related to running it in the separate server
          > > and using the UserTransaction. The deployment descriptor of the EJB
          > > states that it "Supports" transactions.
          >
          > > Any ideas?
          >
          > > Thanks,
          >
          > > John
          >
          > --
          > Dimitri

ERRORsymbol:class UserTransaction(cannot find symbol)/package javax.mail.in

Hi people, I am trying to compile a web proyect in MyEclipse with Ant 1.6.2, but now it appears an error that says :
[javac] F:\...\Doc1.java:13: cannot find symbol
[javac] symbol : class UserTransaction
[javac] location: package javax.transaction
[javac] import javax.transaction.UserTransaction;
[javac] ^
and another one:
[javac] F:\...\Doc2.java:19: package javax.mail.internet does not exist
[javac] import javax.mail.i nternet.MimeMultipart;
[javac] ^
I'm using tomcat 5.5.23
Could anyone say to me why could this happen???I think that I am using all the libraries I need and so on..
Thank you very much!!

You're not using all the libraries you need. :-)
UserTransaction is part of Java EE. You'll need Java EE support in your compilation
environment, and your program won't run on Tomcat. (Java EE support will also
include JavaMail, which you can use separately with Tomcat as well.)

Can i user UserTransaction in a Container-managed transaction Bean

can i use UserTransaction to control transaction boundaries in a container-managed transaction bean method?
below is the method:
there is one-to-many between Employees and SalaryItem
@TransactionAttribute(value = TransactionAttributeType.REQUIRED)
private void initEmployeesSalary(Long salarySumId) {
for(Employees employees: liEmployees){
for (int i = 0; i < 20; i++) {
SalaryItem item = new SalaryDetailItem();
employees.addSalaryItem(item);
when there are about 1000 employees,the method run very slow.
What do you think I should do?
null

Hi again,
The EJB specs say that a stateful Session Bean with CMT is NOT allowed to use the UserTransaction; see page 361 of the EJB2.0 specification. So combining them will not (or should not) work.
I suggest CMT+SessionSynchronization combined with using a flag to indicate whether notify should be called or not. Otherwise, you could try splitting up the bean into two beans: one with CMT and another one without. The one without CMT could use the UserTransaction and notify.
Also, you might want to check http://www.onjava.com/pub/a/onjava/2001/10/02/ejb.html
Hope that helps a bit,
Guy
http://www.atomikos.com

UserTransaction

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