Reentrant call to a stateful session bean
Hi,
I have a problem that seems to be a very common problem but I
steel didn't find any solution for it.
We have a jsp page that call to stateful session been, the
problem occur when I click twice on any link/button then I get
java.rmi.RemoteException: Illegal attempt to make a reentrant call to a stateful
session bean from home:....
I have tried to set the <allow-concurrent-calls> to true but it doesn't help,
I am getting this exception no matter the value of this tag.
I am using WL61 sp2 (the last version) , Does anybody find a solution for that,
I don't want to use javascript in order to work around this problem.
Thanks,
I think this is a different error from concurrent access (when client's
attempt to access the same bean concurrently WebLogic throws LockTimedOut error
(or client blocks if allow-concurrent-calls is true)).
This error probably means that your code attempetd to reenter bean in the same
transaction - how do you invoke it and what is the stack trace?
Haim Cohen <[email protected]> wrote:
Hi,
I have a problem that seems to be a very common problem but I
steel didn't find any solution for it.
We have a jsp page that call to stateful session been, the
problem occur when I click twice on any link/button then I get
java.rmi.RemoteException: Illegal attempt to make a reentrant call to a stateful
session bean from home:....
I have tried to set the <allow-concurrent-calls> to true but it doesn't help,
I am getting this exception no matter the value of this tag.
I am using WL61 sp2 (the last version) , Does anybody find a solution for that,
I don't want to use javascript in order to work around this problem.
Thanks, --
Dimitri
Similar Messages
-
I use EJB3, JPA, JSF in my web application. There are 2 database tables: Teacher and Student. A teacher can have many (or none) students and a student can have at most 1 teacher.
I have a JSF page to print the teacher info and all his students' info. I don't want to load the students' info eagerly because there's another JSF page I need to display the teacher info only. So I have a stateful session bean to retrieve the teacher info and all his students' info. The persistence context in that stateful session bean has the type of PersistenceContextType.EXTENDED. The reason I choose a stateful session bean and an extended persistence context is that I want to write something like this without facing the lazy initialization exception:
<h:dataTable value="#{backingBean.teacher.students}" var="student">
<h:outputText value="${student.name}"/>
</h:dataTable>Because my session bean is stateful, I have a method with the @Remove annotation. This method is empty because I don't want to persist anything to the database.
Now, my question is: How can I make the @Remove method of my stateful session bean be called automatically when my JSF page finishes being rendered?Philip Petersen wrote:
I have a few questions concerning the EJB remove method.
1) What is the purpose of calling the remove method on stateless session
bean?There isn't one.
>
2) What action does the container take when this method is called?It checks that you were allowed to call remove (a security check) and then
just returns.
>
3) What happens to the stateless session bean if you do not call the remove
method?Nothing
>
4) Is it a good practice to call the remove method, or should the remove
method be avoided in the case of stateless session beans?
Personally, I never do it.
-- Rob
>
>
Thanks in advance for any insight that you may provide.
Phil--
AVAILABLE NOW!: Building J2EE Applications & BEA WebLogic Server
by Michael Girdley, Rob Woollen, and Sandra Emerson
http://learnWebLogic.com
[att1.html] -
How to get the Stateful Session bean instance in the second call
Hi,
I am new to EJBs. I have made a Stateful session bean on the first jsp page. In this page i am setting certain member variables of the EJB. Now in the second page i want to get these stored values in the EJB.
In the second page do I...
1. Store the instance of Remote Interface in the Session Context of the first JSP page and then in the second page get the Remote interface stored in its session context and call the business functions to get the values. If this is the case then what do u mean by Stateful Session beans??
P.S.- This works fine.
2. Try to get the Remote interface of that particular instance of the EJB(in which the values were stored) and call its business functions. IF this is possible. How do i do it??
thanks in advance
AnuragHi,
thanks for information. But i have one question. In a stateful session bean why do we have to store the Remote Interface on the client side.
I expected in the second jsp page when i do a lookup or create, the container/server should find out whether there is a session bean already created for this session if yes, then return that particular instance of the session bean else create a new one.
If this is not a possible case then a stateful session bean is nuthing but an instance of an object in the EJB container which does not get destroyed unless there is a time out or the remove method is called. It has nuthing to do with session because throughout the session I have to store the remote interface in the session context of the client( the client here means the jsp).
thanks in advance
Anurag -
1) Second thread call to stateful session bean.
Hi Friend,
I read your threads on otn and i compared your problem with us and i analysed that your application and my application is same, So Plese can you help me in some issues.
Friend, Please help me in these issues, Thanks for this
We have very big ADF Swing+BC Application and deployed as Stateful Session Bean. in my application there are 500 Application Modules,For each application module i created Stateful session beans and deployed it on OC4J Container but when working on deployed application then i am getting time out error after 15 min of working.
1). I set that parameter that you mentioned i.e jbo.ejb.txntimeout = 86400,but still it is giving me same error.
2). Second Issue is of ---ORA-01000: maximum open cursors exceeded
For this issue i chaged the Database Parameter i.e OpenCurser=2000, but still it is giving me same error,
is there any parameter on application module required to change so that this error will not come.
3). When i close the form then application module is not releasing database connection.
4). (oracle.oc4j.rmi.OracleRemoteException) Second thread call to stateful session bean
This error is also coming when I am using deployed application for long time i.e more than 15 min for Heavy TransactionsHi Suyog,
How r u?
We all are fine.
I alerady tried for the Max Curser Property but it is not helpfull.
I think again i have to go for closing opened db RS and statements.
Thanks
Vijay -
OrionRemoteException: Second thread call to stateful session bean
What happen for "com.evermind.server.rmi.OrionRemoteException: Second thread call to stateful session bean".
I am using JSP/Servlet/EJB and OC4J. When user click the JSP page button to fast, sometimes the error will appear, and then the OC4J will stop, I need to restart the OC4J.
I am using standlone OC4J 9.0.3.0.0
Thanks in advance,
PerryHave you cached the remote object you obtained for the stateful session beamn and are reusing the same object on subsequent requests from the JSP page? So in effect, you are making a second call to the bean before the first method call completes?
Without knowing anything about what you are doing or how you app is constructed, you may want to set some form of flag for the user session to indicate whether the bean is in use, which you can check before using the bean in requests. When the bean method call completes, open the gate again. If the bean is in use, return a nice message to the user telling them to hold off for a short while.
-steve- -
EJB 2.0 STATEFUL SESSION BEANS -- ejbPassivate or ejbActivate is not called
Hi,
am using Oracle Jdevloper 9i. When i use Stateful Session beans the ejbPassivate or ejbActivated methods are not being called. What is the reason?Hi Arun,
The decision of when to passivate a stateful session bean is up to a particular vendor's implementation. Typically each vendor will have some configuration that controls this decision, but it's certainly common for passivation to not take place for a given workload. Your best bet is to look at the Oracle documentation to see how the container makes its passivation decision.
--ken -
Call existing stateful session bean in different servlets
hello,
we are implementing a shopping cart for our online dvd store in netbeans 5.5.1 and ejb 3.0.
for that we use a stateful session bean, which is created when a user is logging in for connecting the user-entity to the bean.
after logging in, the list servlet, which displays a list of all available dvds, is shown. after clicking the "add to shopping cart" button, the cart servlet with a list of all added dvds is shown. in this servlet we want to reactivate the existing stateful session bean. is this possible? and when it's possible, how is it possible? ;)
our sessionbean with initialize() method:
@Stateful
public class CartBean implements Cart {
UserEntity user;
List<DVDEntity> contents;
public void initialize(UserEntity user){
System.out.println("Warenkorb erstellt");
this.user = user;
contents = new ArrayList<DVDEntity>();
}thx!
Edited by: licherpremium on Nov 8, 2007 6:35 AMhello,
we are implementing a shopping cart for our online dvd store in netbeans 5.5.1 and ejb 3.0.
for that we use a stateful session bean, which is created when a user is logging in for connecting the user-entity to the bean.
after logging in, the list servlet, which displays a list of all available dvds, is shown. after clicking the "add to shopping cart" button, the cart servlet with a list of all added dvds is shown. in this servlet we want to reactivate the existing stateful session bean. is this possible? and when it's possible, how is it possible? ;)
our sessionbean with initialize() method:
@Stateful
public class CartBean implements Cart {
UserEntity user;
List<DVDEntity> contents;
public void initialize(UserEntity user){
System.out.println("Warenkorb erstellt");
this.user = user;
contents = new ArrayList<DVDEntity>();
}thx!
Edited by: licherpremium on Nov 8, 2007 6:35 AM -
Accessing the same stateful session bean from multiple clients in a clustered environment
I am trying to access the same stateful session bean from multiple
clients. I also want this bean to have failover support so we want to
deploy it in a cluster. The following description is how we have tried
to solve this problem, but it does not seem to be working. Any
insight would be greatly appreciated!
I have set up a cluster of three servers. I deployed a stateful
session bean with in memory replication across the cluster. A client
obtains a reference to an instance of one of these beans to handle a
request. Subsequent requests will have to use the same bean and could
come from various clients. So after using the bean the first client
stores the handle to the bean (actually the replica aware stub) to be
used by other clients to be able to obtain the bean. When another
client retrieves the handle gets the replica aware stub and makes a
call to the bean the request seems to unpredictably go to any of the
three servers rather than the primary server hosting that bean. If the
call goes to the primary server everything seems to work fine the
session data is available and it gets backed up on the secondary
server. If it happens to go to the secondary server a bean that has
the correct session data services the request but gives the error
<Failed to update the secondary copy of a stateful session bean from
home:ejb20-statefulSession-TraderHome>. Then any subsequent requests
to the primary server will not reflect changes made on the secondary
and vice versa. If the request happens to go to the third server that
is not hosting an instance of that bean then the client receives an
error that the bean was not available. From my understanding I thought
the replica aware stub would know which server is the primary host for
that bean and send the request there.
Thanks in advance,
Justin
If 'allow-concurrent-call' does exactly what you need, then you don't have a problem,
do you?
Except of course if you switch ejb containers. Oh well.
Mike
"FBenvadi" <[email protected]> wrote:
>I've got the same problem.
>I understand from you that concurrent access to a stateful session bean
>is
>not allowed but there is a
>token is weblogic-ejb-jar.xml that is called 'allow-concurrent-call'
>that
>does exactly what I need.
>What you mean 'you'll get a surprise when you go to production' ?
>I need to understand becouse I can still change the design.
>Thanks Francesco
>[email protected]
>
>"Mike Reiche" <[email protected]> wrote in message
>news:[email protected]...
>>
>> Get the fix immediately from BEA and test it. It would be a shame to
>wait
>until
>> December only to get a fix - that doesn't work.
>>
>> As for stateful session bean use - just remember that concurrent access
>to
>a stateful
>> session bean is not allowed. Things will work fine until you go to
>production
>> and encounter some real load - then you will get a surprise.
>>
>> Mike
>>
>> [email protected] (Justin Meyer) wrote:
>> >I just heard back from WebLogic Tech Support and they have confirmed
>> >that this is a bug. Here is their reply:
>> >
>> >There is some problem in failover of stateful session beans when its
>> >run from a java client.However, it is fixed now.
>> >
>> >The fix will be in SP2 which will be out by december.
>> >
>> >
>> >Mike,
>> >Thanks for your reply. I do infact believe we are correctly using
>a
>> >stateful session bean however it may have been misleading from my
>> >description of the problem. We are not accessing the bean
>> >concurrently from 2 different clients. The second client will only
>> >come into play if the first client fails. In this case we want to
>be
>> >able to reacquire the handle to our stateful session bean and call
>it
>> >from the secondary client.
>> >
>> >
>> >Justin
>> >
>> >"Mike Reiche" <[email protected]> wrote in message
>news:<[email protected]>...
>> >> You should be using an entity bean, not a stateful session bean
>for
>> >this application.
>> >>
>> >> A stateful session bean is intended to be keep state (stateful)
>for
>> >the duration
>> >> of a client's session (session).
>> >>
>> >> It is not meant to be shared by different clients - in fact, if
>you
>> >attempt to
>> >> access the same stateful session bean concurrently - it will throw
>> >an exception.
>> >>
>> >> We did your little trick (storing/retrieving handle) with a stateful
>> >session bean
>> >> on WLS 5.1 - and it did work properly - not as you describe. Our
>sfsb's
>> >were not
>> >> replicated as yours are.
>> >>
>> >> Mike
>> >>
>> >> [email protected] (Justin Meyer) wrote:
>> >> >I am trying to access the same stateful session bean from multiple
>> >> >clients. I also want this bean to have failover support so we want
>> >to
>> >> >deploy it in a cluster. The following description is how we have
>tried
>> >> >to solve this problem, but it does not seem to be working. Any
>> >> >insight would be greatly appreciated!
>> >> >
>> >> >I have set up a cluster of three servers. I deployed a stateful
>> >> >session bean with in memory replication across the cluster. A client
>> >> >obtains a reference to an instance of one of these beans to handle
>> >a
>> >> >request. Subsequent requests will have to use the same bean and
>could
>> >> >come from various clients. So after using the bean the first client
>> >> >stores the handle to the bean (actually the replica aware stub)
>to
>> >be
>> >> >used by other clients to be able to obtain the bean. When another
>> >> >client retrieves the handle gets the replica aware stub and makes
>> >a
>> >> >call to the bean the request seems to unpredictably go to any of
>the
>> >> >three servers rather than the primary server hosting that bean.
>If
>> >the
>> >> >call goes to the primary server everything seems to work fine the
>> >> >session data is available and it gets backed up on the secondary
>> >> >server. If it happens to go to the secondary server a bean that
>has
>> >> >the correct session data services the request but gives the error
>> >> ><Failed to update the secondary copy of a stateful session bean
>from
>> >> >home:ejb20-statefulSession-TraderHome>. Then any subsequent requests
>> >> >to the primary server will not reflect changes made on the secondary
>> >> >and vice versa. If the request happens to go to the third server
>that
>> >> >is not hosting an instance of that bean then the client receives
>an
>> >> >error that the bean was not available. From my understanding I
>thought
>> >> >the replica aware stub would know which server is the primary host
>> >for
>> >> >that bean and send the request there.
>> >> >
>> >> >Thanks in advance,
>> >> >Justin
>>
>
>
-
Error in updating secondary stateful session bean
Hi all,
I have set up a cluster of 2 managed servers with WebLogic 6.1. I have a
stateful session bean and several stateless session beans. the stateful
session bean keeps user info and limited cached objects, all are
serializable. it seems working fine, even after killing any one of the
servers, as long as one is alive. a java application client creates a
stateful session bean first, then calls stateless session beans with the
remote interface of the stateful bean as a method parameter. No problem
when stateful session bean is created. However, each stateless bean method
generates the following error message if I turn the debug on (level 64). No
exception stack traces, and all methods execute successfully.
<Error> <EJB> <Failed to update the secondary copy of a stateful session
bean from home:clientsession>
I wonder what causes the error, and why it tries to update the stateful
session bean. in all stateless session beans, only read into the stateful
bean.
Thank you,
Fujin
This has been fixed in WLS 6.1 SP2.
jagdip Talla wrote:
> Hi Fujin,
> please let me know, if u were able to solve the problem..
>
> hi guys,
> appreciate if you could give me some clues
> how to solve this problem ?
>
> i hv 2 WLS instances in a cluster,
> when one server instance is shut down, i keep getting these errors ?
> is it normal ?
> <Feb 19, 2002 2:57:53 PM SGT> <Error> <EJB> <Failed to update the secondary copy of a stateful session bean from home:ejb/xyzrel1_2/xxxxHome>
>
> appreciate if u can let me know, if u could solve it..?
>
> thanks n regads
> jagdip
Rajesh Mirchandani
Developer Relations Engineer
BEA Support
-
How create EJB 2.1 Stateful Session Bean in a EJB 3.0 Session Bean
Hi All,
We have been developing on EJB 2.1. We are now adding a module on EJB 3.0.
How can we "create" a stateful session bean with create method signature similar to create(String id)?
We have tried
// this is the remote interface
@EJB AddressBean abean;
But not working
Any help will be appreciated.There is no explicit create() call for EJB 3.0 session beans. It doesn't really matter though
since you can accomplish the same thing by defining your own business method to act
as an initializer for whatever state you'd like. E.g.
@Remote
public interface FooInterface {
public void initialize(String id);
// ... other business methods
@EJB FooInterface fooRef;
fooRef.initialize("foo");
--ken -
How do i get back my stateful session bean after it has been passivated
hi ,
How do i get back my stateful session bean after it has been passivated by container.
i'm confused that is it possible or not .......give me answer
i've one stateful sessionbean which i'm accessing throgh my normal java client . now what i'm doing is when i first time call a method it is running ......then i'm shutting down the server jboss .......it is calling my ejbPassivate() method ... at this particular time client program doesn't do anything.....
now after i restart my server i'm again calling back that business method with that last object reference.......it gives me the exception given below.....
java.rmi.NoSuchObjectException: no such object in table
java.rmi.NoSuchObjectException: no such object in table
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:118)
at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:227)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:167)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
at org.jboss.proxy.ejb.StatefulSessionInterceptor.invoke(StatefulSessionInterceptor.java:106)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
at $Proxy1.makeNewAcc(Unknown Source)
at client.GanJavaClient.main(GanJavaClient.java:46)so pls tell me that is it possible to get back that session besn or notStateful session beans are not persisted across restart of the EJB server instance(s) hosting them. You can't treat a Session bean as one would an entity bean.
Chuck -
How to track the stateful Session Bean?
Hi all,
Am in a serious trouble. I have a message driven bean which will get initiated when some message gets dumped into the queue. I have got session bean which i use to process message which my message driven bean takes from the queue.
My problem is, lets say there are 3 msgs in the queue. lets say the messages be "aaaa", "aaaa" and "bbbb".
In this case, when i read the first message, i will create an instance of the session bean to process the message "aaaa". When i receive the second message still i create an instance to process the message "aaaa". When i get the 3rd message, i create an instance to process the message "bbbb".
My problem in this is, i want to create only one instance of session bean for the message "aaaa".
So once i create the instance for session bean for particular message, i need to store the object or something of the instance which i created along with the message. Please help me with what i can store with which i can reffer to the session bean again.
Please see the sample code too.
Thanks in advance,
Ashly
if(msg.equals("aaaa"))
First n;
Object obj = ctx.lookup("ejb/First");
FirstHome home = (FirstHome) PortableRemoteObject.narrow(obj, FirstHome.class);
n = home.create(msg);
}Hi,
thanks for information. But i have one question. In a stateful session bean why do we have to store the Remote Interface on the client side.
I expected in the second jsp page when i do a lookup or create, the container/server should find out whether there is a session bean already created for this session if yes, then return that particular instance of the session bean else create a new one.
If this is not a possible case then a stateful session bean is nuthing but an instance of an object in the EJB container which does not get destroyed unless there is a time out or the remove method is called. It has nuthing to do with session because throughout the session I have to store the remote interface in the session context of the client( the client here means the jsp).
thanks in advance
Anurag -
Passivation of Connection Object in Stateful Session Bean
Hi all,
I am developing a Stateful session bean that has a Connection object as its instance variable. And this bean starts transaction that spans across multiple method calls and finally either commit or rollback.
BeanClass
UserTransaction utx;
Connection conn;
ejbCreate()
allocateconnection();
ejbRemove()
closeconnection();
ejbActivate()
allocateconnection();
ejbpassivate()
closeconnection();
StartTransaction()
utx = getusertransaction();
utx.begin();
Method1()
do something with database
Method2()
do something with database
CommitTransaction()
utx.commit();
For example, the typical usage of this bean would be:
bean.StartTransaction();
bean.Method1();
bean.Method2();
bean.CommitTransaction();
Here are my two questions:
1. General Question: In order for a Connection object to join a Transaction, Do I have to create the connection after the transaction has started?
2. If the answer to the above question is yes, then: I understand that when this bean get passivated, the UserTransaction instance object would be passivated. And since the connection object can't not be passivated, I have to recreate the connection object in ejbactivate() method, would newly created connection participate in the same Transaction that was being passivated and now activated?>
Hi all,
I am developing a Stateful session bean that has a
Connection object as its instance variable. And this
bean starts transaction that spans across multiple
method calls and finally either commit or rollback.
BeanClass
UserTransaction utx;
Connection conn;
ejbCreate()
allocateconnection();
ejbRemove()
closeconnection();
ejbActivate()
allocateconnection();
ejbpassivate()
closeconnection();
StartTransaction()
utx = getusertransaction();
utx.begin();
Method1()
do something with database
Method2()
do something with database
CommitTransaction()
utx.commit();
For example, the typical usage of this bean would be:
bean.StartTransaction();
bean.Method1();
bean.Method2();
bean.CommitTransaction();
Here are my two questions:
1. General Question: In order for a Connection object
to join a Transaction, Do I have to create the
connection after the transaction has started?Strictly NO. In fact, the connection is obtained first and then can a transaction begin.
2. If the answer to the above question is yes, then: I
understand that when this bean get passivated, the
UserTransaction instance object would be passivated.
And since the connection object can't not be
passivated, I have to recreate the connection object
in ejbactivate() method, would newly created
connection participate in the same Transaction that
was being passivated and now activated?
The answer to first question being NO, your argument for question 2 does not hold true. According to the EJB specification, a stateful session bean can only be passivated between the transaction and not within a transaction. Your implementation for the stateful EJB is good to work. -
Lock Timed out exception in stateful Session Bean
Hi All,
We have a stateful session bean and put the reference of the bean in HttpSession
and retrieve it from other JSP.
While calling a method from bean, we are often getting the following exception.
Any help please?
weblogic.ejb.extensions.LockTimedOutException: Lock for primaryKey:1018581328443_46
could not be acquired without waiting.
at weblogic.ejb.internal.LockManagerImpl.lock(LockManagerImpl.java:134)
at weblogic.ejb.internal.LockManagerImpl.lock(LockManagerImpl.java:81)
at weblogic.ejb.internal.StatefulEJBCache.bind(StatefulEJBCache.java:447)
at weblogic.ejb.internal.StatefulEJBObject.getContextForInvoke(StatefulEJBObject.java:159)
at weblogic.ejb.internal.BaseEJBObject.preInvoke(BaseEJBObject.java:487)
at com.elink.jbe.savejobses.SaveJobSesBeanEOImpl.getJobHeaderData(SaveJobSesBeanEOImpl.java:1258)
at jsp_servlet._jobentry._jbeenquirydefaults._jspService(_jbeenquirydefaults.java:243)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:123)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:761)
at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:708)
at weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:252)
at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:346)
at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:246)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135)Hi Arjuna,
Thanks for your suggestions. But can you also help me how to make the session
bean thread safe?
Thanks in Advance
Srinath
"Arjuna Chala" <[email protected]> wrote:
Looks like you have two threads accessing the bean at the same time.
You
need to make it thread safe. Also, store the handle of the session bean
instead of the session bean itself in the session.
By the way, session beans (handle or otherwise) are not meant to be stored
in the HttpSession, and here is why:
http://groups.google.com/groups?q=stateful+session+bean+httpsession&hl=en&se
lm=3b72acb9%40newsgroups.bea.com&rnum=6
"srinath" <[email protected]> wrote in message
news:[email protected]...
Hi All,
We have a stateful session bean and put the reference of the bean inHttpSession
and retrieve it from other JSP.
While calling a method from bean, we are often getting the followingexception.
Any help please?
weblogic.ejb.extensions.LockTimedOutException: Lock forprimaryKey:1018581328443_46
could not be acquired without waiting.
atweblogic.ejb.internal.LockManagerImpl.lock(LockManagerImpl.java:134)
atweblogic.ejb.internal.LockManagerImpl.lock(LockManagerImpl.java:81)
atweblogic.ejb.internal.StatefulEJBCache.bind(StatefulEJBCache.java:447)
atweblogic.ejb.internal.StatefulEJBObject.getContextForInvoke(StatefulEJBObjec
t.java:159)
atweblogic.ejb.internal.BaseEJBObject.preInvoke(BaseEJBObject.java:487)
atcom.elink.jbe.savejobses.SaveJobSesBeanEOImpl.getJobHeaderData(SaveJobSesBea
nEOImpl.java:1258)
atjsp_servlet._jobentry._jbeenquirydefaults._jspService(_jbeenquirydefaults.ja
va:243)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:123)
atweblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
l.java:761)
atweblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
l.java:708)
atweblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
Manager.java:252)
atweblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:346)
atweblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:246)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135) -
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
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