EJB Timer problem

Hi all, I'm trying to run the J2EE Tutorial EJB Timer sample, but I keep getting an exception:
Errors while obtaining information about the database. Got the following exception:
java.sql.SQLException: Error in allocating a connection. Cause:
Connection could not be allocated because: Connection does not exist.
com.sun.jdo.api.persistence.support.JDOFatalInternalException:
JDO76519: Failed to identify vendor type for the data store.
NestedException: java.sql.SQLException: Error in allocating a connection.
Cause: Connection could not be allocated because: Connection does not exist. .The tutorial says that I should start the PointBase database first, and I did; but there seems to be something missing, like the server is trying to lookup some datasource and it can't find it.
Any ideas?

Hi ,,
Go THru this article, sure it helps .
http://www.oracle.com/technology/sample_code/tutorials/fbs10g/fbs10gtoc.htm
Reg
VArun CN

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Hi,
suppose on a GlassFish 2.1 cluster (two instances on one machine) you deploy an ejb app which contains an ejb timer. The ejb timer executes every 60 seconds.
Following questions come to my mind:
1. After deployment do you have (the same) ejb timer on each instance (both using the same connection pool) ?
2. If so, how it is guaranteed that every 60 seconds only one timer is executed?
3. Is it possible to have a "singleton" timer for all instances in a cluster?
Thx for your help.

EJB 3.0 only supports programmatic timer creation. The app can contain an enterprise bean component that supports timer callbacks (a "timed object" in spec parlance) , but the actual timers can only be created by calling TimerService.createTimer(). Given that :
1. There is no automatic timer creation as a result of deployment. Some developers approximate automatic timer creation
by calling a stateless session bean method from a web application initialization callback, but from the ejb container's perspective
that's just a normal run-time timer creation. In all cases you'll have as many timers as the number of times TimerService.createTimer() was called.
2. In a cluster, for each unique timer, each timer timeout callback will happen in only one server instance in the cluster. We do that
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Hi,
I would like to know on the scope of an instance variable of a Stateless Bean object,
when used in a EJB Timer call back.Let me explain this in more detail below.
I have a requirement to use a EJB Timer.
For this, I have created a stateless object since Timer creation needs to be done
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In the timer call back(ejbTimeout), I am able to use this count variable during
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2) If the Bean object is not destroyed, then when does the bean object get destroyed?
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Ulrich

Hi Ulrich,
The ejb timer is associated with the stateless session bean component, not with a particular bean instance. There is no formal relationship between the bean instance that called createTimer() and the bean instance on which the timer callback happens. If they're the same in your test run that's just a coincidence and not something your application should be depending on.
In the stateless session bean model, the container can create and destroy stateless session bean instances at any time. The container is free to pick any stateless session bean instance to service any client invocation or timer callback. If you need to pass context into a timer callback, one way to do it is via the timer "info" object. However, the info object is immutable so it wouldn't be a good match for a counter. You could of course always just use a database for any necessary coordinated state.
--ken

Hi , any body can send real time problems they faced

hi every body this is siva from banglore, any body can send the real time problems they faced in sap crm and how they solved if any body kindly send to my id : [email protected]

hi Siva,
All the issues in the forums are the real time issues
YOu can just go through them .
Also why do you need real time issues.
If you have any issues post it here and some one can help you

Message sent time problem

i have message sent time problem on my N73
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It's a bug that every N73 owners have.
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Dear community,
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Well I still dunno what the problem was. It seemed as if the system would have to be running for a day or two before it would start to speed up, as if it was actually gaining a few milliseconds cumulatively every second...
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EJB Timer Services - timeout overlapping

Hi,
I have this question:
What should happen if the @Timeout method spends more time in working
something than the timer expiration time?
For example:
EJB timer is created with interval (expiration time) every 3 minutes. But for some reason the EJB binded to this timer is spending 4 minutes to process a timer notification. What happens with the next incoming timer notification?
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Thanks!

Hi Fellipe,
This case isn't explicitly mentioned in the spec since the expectation is that the processing
time for the timeout would be much shorter than the interval itself. The design center for the
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timeouts are on the order of hours or days, even though the actual type in the API is
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Window 2008 R2 datacentre server time problem

Hi Team,
I have one window 2008 R2 data centre server, which having time problem, I have setted IST time zone but time coming 15 minute delay, I have tried to correct time by manual but time goes again 15 minute delay itself.
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Regards
Inder Singh Rawat

Hi ,
I followed following step to build NTP in window server 2008 R2.
Enabling & Configuring NTP Server
1. Change the server type to NTP.
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters\Type
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3. Enable NTPServer.
Locate and then click the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer
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Regards
Inder Singh Rawat

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I can receive, but not send emails on iPad. All settings checked several times and with internet provider. imap settings confirmed as ok. Account deleted and set up under guidance of service provider several times - problem not solved - help!!

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http://appletoolbox.com/2012/01/server-does-not-allow-relaying-email-error-fix/
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http://www.ehow.co.uk/info_8693415_ipad-say-cannot-connect-server.html
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Try this first - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons. (This is equivalent to rebooting your computer.)
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 Cheers, Tom

Occasional time problems?

i have my iphone set to automatically set the date and time. a few times since i've had it, the time is ahead one full hour...it seems to happen when the phone is shut down then turn back on, but i think one time it had the wrong time after being left on standby. any thoughts? is this an AT&T issue? i can't think of anything that could be wrong with the phone (or phone setting) which could contribute to this, since i'm chosing the automatic option for setting the time. small issue i know...just curious.

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Is it possiblle to configure WL 10.3.5 so that ejb timer information is stored into JDBC persistent store instead of the default file store?
Where can I find documentation about that ?
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Thanks

Is it possiblle to configure WL 10.3.5 so that ejb timer information is stored into JDBC persistent store instead of the default file store?
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I will specify my problem a little more:
I have an Entity named zuordnung_module_lv_ma this references an Entity lehrveranstaltungen.
In zuordnung_module_lv_ma :
@OneToMany
@JoinColumn(...)
public Collection<lehrveranstaltungen> lv = new ArrayList...
For more detailed information look at this:
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SQL:
create table BLOECKE
BLOCKID integer not null,
WOCHENTAG integer,
ZEIT_VON datetime,
ZEIT_BIS datetime,
LOGISCHGELOESCHT char not null,
constraint PK_BLOECKE primary key (BLOCKID)
create table CURRICULA
CURRICULUMKUERZEL varchar not null,
CURRICULUMBEZ varchar,
CURRICULUMID integer not null,
IDVERANTWORTLICHERSTUDIENDEKAN integer,
LOGISCHEGELOESCHT char not null,
constraint PK_CURRICULA primary key (CURRICULUMID)
create table LEHRVERANSTALTUNGEN
MODUL_ID integer not null,
LV_ID integer not null,
SWS double not null,
ART_LV char not null,
LOGISCHGELOESCHT char not null,
MAXTEILNEHMER integer not null,
constraint PK_LEHRVERANSTALTUNGEN primary key (MODUL_ID, LV_ID, ART_LV)
create table MITARBEITER
MA_ID integer not null,
TITEL varchar,
NACHNAME varchar not null,
VORNAME varchar not null,
AUFGELAUFENESWS integer,
LETZTESFORSCHUNGSFREISEMESTER varchar,
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ENDEANSTELLUNG date,
MA_KUERZEL varchar not null,
GEBURTSDATUM date,
LOGISCHGELOESCHT char not null,
MA_KATEGORIE_ID integer,
constraint PK_MITARBEITER primary key (MA_ID)
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MA_KATEGORIE_BEZ varchar not null,
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MODUL_ID integer not null,
MODULKUERZEL varchar not null,
IDMODULVERANTWORLTICHER integer not null,
IDSTVMODULVERANTWORTLICHER integer,
CURRICULUMID integer,
ID_MODULGRUPPE varchar,
MODULNAME varchar,
PFLICHTFACH binary,
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CREDITPOINTS integer,
LOGISCHGELOESCHT char not null,
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CURRICULUMID integer not null,
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MODULGRUPPENBEZ varchar,
LOGISCHGELOESCHT char not null,
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create table ZUORDNUNG_MODUL_CURRICULUM
MODUL_ID integer not null,
CURRICULUMID integer not null,
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BLOCKID integer not null,
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LOGISCHGELOESCHT char not null,
constraint PK_ZUORDNUNG_MODUL_LV_MA_SEMIN primary key (MODUL_ID, LV_ID, ART_LV, SEMESTER, MA_ID, WOCHE_G_U, BLOCKID, EXEMPLAR)
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add constraint FK_CURRICUL_ZURODNUNG_MITARBEI foreign key (IDVERANTWORTLICHERSTUDIENDEKAN)
references MITARBEITER (MA_ID)
on update restrict
on delete restrict;
alter table LEHRVERANSTALTUNGEN
add constraint FK_LEHRVERA_ZURODNUNG_MODULE foreign key (MODUL_ID)
references MODULE (MODUL_ID)
on update restrict
on delete restrict;
alter table MITARBEITER
add constraint FK_MITARBEI_ZUORDNUNG_MITARBEI foreign key (MA_KATEGORIE_ID)
references MITARBEITERKATEGORIE (MA_KATEGORIE_ID)
on update restrict
on delete restrict;
alter table MODULE
add constraint FK_MODULE_ZUORDNUNG_MITARBEI foreign key (IDMODULVERANTWORLTICHER)
references MITARBEITER (MA_ID)
on update restrict
on delete restrict;
alter table MODULE
add constraint FK_MODULE_ZUORDNUNG_MODULGRU foreign key (CURRICULUMID, ID_MODULGRUPPE)
references MODULGRUPPEN (CURRICULUMID, ID_MODULGRUPPE)
on update restrict
on delete restrict;
alter table MODULGRUPPEN
add constraint FK_MODULGRU_ZUORDUNG__CURRICUL foreign key (CURRICULUMID)
references CURRICULA (CURRICULUMID)
on update restrict
on delete restrict;
alter table ZUORDNUNG_MODUL_CURRICULUM
add constraint FK_ZUORDNUN_ZUORDNUNG_CURRICUL foreign key (CURRICULUMID)
references CURRICULA (CURRICULUMID)
on update restrict
on delete restrict;
alter table ZUORDNUNG_MODUL_CURRICULUM
add constraint FK_ZUORDNUN_ZUORDNUNG_MODULE foreign key (MODUL_ID)
references MODULE (MODUL_ID)
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on delete restrict;
alter table ZUORDNUNG_MODUL_LV_MA_SEMINAR_EXEMPLAR
add constraint FK_ZUORDNUN_ZUORDNUNG_BLOECKE foreign key (BLOCKID)
references BLOECKE (BLOCKID)
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alter table ZUORDNUNG_MODUL_LV_MA_SEMINAR_EXEMPLAR
add constraint FK_ZUORDNUN_ZURODNUNG_LEHRVERA foreign key (MODUL_ID, LV_ID, ART_LV)
references LEHRVERANSTALTUNGEN (MODUL_ID, LV_ID, ART_LV)
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on delete restrict;
alter table ZUORDNUNG_MODUL_LV_MA_SEMINAR_EXEMPLAR
add constraint FK_ZUORDNUN_ZURODNUNG_MITARBEI foreign key (MA_ID)
references MITARBEITER (MA_ID)
on update restrict
on delete restrict;
THX for prospective comments!

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[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterBean.
java:12: cannot resolve symbol
[javac] symbol : class SessionContext
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[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterBean.
java:15: cannot resolve symbol
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[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterBean.
java:37: cannot resolve symbol
[javac] symbol : class SessionContext
[javac] location: class ConverterBean
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[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterHome.
java:12: cannot resolve symbol
[javac] symbol : class CreateException
[javac] location: package ejb
[javac] import javax.ejb.CreateException;
[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterHome.
java:13: cannot resolve symbol
[javac] symbol : class EJBHome
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[javac] import javax.ejb.EJBHome;
[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterHome.
java:15: cannot resolve symbol
[javac] symbol : class EJBHome
[javac] location: interface ConverterHome
[javac] public interface ConverterHome extends EJBHome {
[javac] ^
[javac] E:\MostlyJava\j2eetutorial\examples\src\ejb\converter\ConverterHome.
java:17: cannot resolve symbol
[javac] symbol : class CreateException
[javac] location: interface ConverterHome
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[javac] ^
[javac] 10 errors
BUILD FAILED
E:\MostlyJava\j2eetutorial\examples\build.xml:89: Compile failed, messages shoul
d have been provided.
Total time: 2 seconds

Thanks, for your reply the problem was with the classpath, even though it appears that the ant script points to it I had to set it in the environment.

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Alex,
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CORBA). But when EJB was trying to connect to Oracle9i I got such error :
javax.naming.NameNotFoundException:
sess_iiop://<server_ip>:<port>:<sid>/etc/OLAPServer/OLAPServer not found
I think it something wrong with my OAS enviroment. I have tried to do my best , but still nothing .... ( I am sure that everything else is OK, because I tried to make connection through
JDBC to relational database and it worked fine).
When I'm starting EJB's code as client application everything is OK. The
connection to OLAPService is established every time. When I modyfied code
for EJB (commenting code responsible for preparing InitailContextEnviroment
and connecting to OLAPService) everything was OK. So :
1) I can connect and invoke EJB's method deployed to OAS,
2) I can connect to Oracle9i OLAPService and use OLAPAPI methods,
3) I can't do it when I try to connect to OLAPService through the OAS (where
is EJB)
client_application (java) ===CORBA===> OAS ( EJB with OLAPAPI) ==CORBA==>
OLAPService
This is the EJB's method code ( when it is calling as client application it
works!!!!):
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import org.omg.CORBA.Object;
import oracle.aurora.jndi.sess_iiop.ServiceCtx;
import oracle.express.connection.Connection;
import oracle.express.connection.ConnectionManager;
import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.*;
public String Polaczenie()
String serviceURL="sess_iiop://<server_ip>:<port>:<sid>";
String objectName="/etc/OLAPServer/OLAPServer";
Hashtable env=new Hashtable();
env.put(Context.URL_PKG_PREFIXES,"oracle.aurora.jndi");
env.put(Context.SECURITY_PRINCIPAL,<user>);
env.put(Context.SECURITY_CREDENTIALS,<password>);
env.put(Context.SECURITY_AUTHENTICATION,ServiceCtx.NON_SSL_LOGIN);
try
Context ic=new InitialContext(env);
org.omg.CORBA.Object
ServiceStub=(org.omg.CORBA.Object)(ic.lookup(serviceURL+objectName));
Properties connParams = new Properties();
connParams.put("UserID",<user>);
connParams.put("Password",<password>);
ConnectionManager cm=ConnectionManager.init();
Connection conn=
cm.connect((org.omg.CORBA.Object)ServiceStub,connParams);
conn.close();
catch(Exception e)
return "\nError:" + e + "\n";
return "\nIt works\n";
This is client's code:
public static void main(String[] args)
try {
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.PROVIDER_URL, "ormi://sasza/SerwerEjb");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "oracle");
Context context = new
com.evermind.server.rmi.RMIInitialContextFactory().getInitialContext(env);
Object homeObject = context.lookup("<myEJBName>");
SerwerEjbHome home = (SerwerEjbHome)
PortableRemoteObject.narrow(homeObject, pakiet.SerwerEjbHome.class);
SerwerEjb remote = home.create();
System.out.println(remote.Polaczenie()); <------------------ there is
error !!!!!!!!!!!!!!!!!! ------------------>
catch(Exception e)
System.err.println("Error: " + e + ":::" + e.getMessage());
Any idea ??
Thank you in advance.

"Taesun, An" <[email protected]> writes:
Thanks for your concern !Its my code - I should be concerned :)
I have successfuly tested the sample program that you attached.
and I have some more questions.Great!
Q1) Can I use idl files generated by weblogic.ejbc on the other ORB like as
orbix, etc..?Yes. But the problem is that Orbix is known to have problems with the
codeset that we send out. For silversword we are doing a GIOP 1.2
implementation a by-product of which will be that we have to do some
form of codeset negotiation, so hopefully these issues will be sorted
in the near future.
And I know that the Client.cpp program you sent differs from original source
code in the respects which is including TradeResultFactory and
TradeResultImpl classes.
Q2) If so, Do i have to implement the above classes for all of call by value
parameters or return type ?You have to write some C++ code for any valuetypes that you use. This
basically means any non-primitive object that is not a remote
interface and implements serializable.
I wanna know for the needed classes how to easily get generated or the other
solutions.I attach the entity bean example I cooked up which shows you how you
can use C++ macros to take away some of this pain. Note that you cannot make the finder method work with 6.0SP2. This will be fixed in 6.1
[generic_idl_entity.zip]
I got error message following as, when i used "-idlFactories" of
weblogic.ejbc option to generate Factory definition.
Usage: java weblogic.rmic [options] <classes>...
option descriptions ,.,........
option descriptions ,.,........
ERROR: Error from ejbc: Unrecognized option or flag, -idlFactories
ERROR: ejbc found errors
make: *** [ejbc] Error 1Hmm, you are right. It looks like the option didn't get inverted in
rmic. The attached class file should fix this.
[IDLGeneratorOptions.class]
andy

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