Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
snip
The servlet engine uses parallel WorkerThreads to handle all incoming
requests.
So you have to make sure that parallel servlet threads don't
access the
broker variable without proper synchronization.
How could I be sure?
I answered this in my original reply: always allocate new broker
instances and release them back to the pool after use.
How do you mean about proper synchronization?
I meant using Java synchronization to lock access to the broker instance.
Do you say that all threads use the same class instance?
If you mean Class object then yes,
If you mean instance of a class then no.
I don't understand what you mean? What's the difference between a Class object and an instance of a Class?
java.lang.Object.class is an object of type java.lang.Class
new Object() is an instance of the class java.lang.Object().
If I declare each time a new PB instance, is this solution
thread safe?
You have to make sure that each thread (also servlet engine
threads) always
work with their only broker instance and not with a shared instance.
The most simple way to achieve this is to use a new PB
instance in each
call.
OK. You declare eache time a new PB instance like:
PersistenceBroker pb = PersistenceBrokerFactory
exactly!
cheers,
Thomas
Thanks
Sylvain
Of course it's important to close the PB imediately after the
unit of work
is completed
cheers,
Thomas
Thanks
Sylvain
broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(),
person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
If the exception really caused by
broker.abort in searchPerson(String lastName),
don't use the class field broker in your search method
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
and repeat your test.
regards,
Armin
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the
transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
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PB error when the browser is stoped
Hello, I'using PB intances to retrieve info from my database. When the time to search information is too long you can press the stop button on the browser. But when I restart my application there is a TransactionNotInProgress exception. Maybe the PB instance isn't closed when I stop the transaction!?? How could I close the PB intansce when I stop the browser? How could I manage this? Is someone has an experience? Thanks Sylvain - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: PB error when the browser is stoped
Hi Sylvain, [EMAIL PROTECTED] wrote: Hello, I'using PB intances to retrieve info from my database. When the time to search information is too long you can press the stop button on the browser. But when I restart my application there is a TransactionNotInProgress exception. Maybe the PB instance isn't closed when I stop the transaction!?? How could I close the PB intansce when I stop the browser? How could I manage this? Is someone has an experience? Can you describe more detailed, some pseudo code? Which version do you use? regards, Armin Thanks Sylvain - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: PB error when the browser is stoped
Hi,
[EMAIL PROTECTED] wrote:
Hello Armin,
I'm using OJB 0.9.5.
uuh! a real oldtimer ;-)
The code is below.
The stop button is pressed during the execution time of this method below.
I think that there something wrong because after I press stop and refresh the page,
a TransactionNotInProgressException occured.
Have you an idea?
Thanks
Sylvain
**code**
public void searchPerson(String lastName) {
Criteria crit = new Criteria();
crit.addLike(lastName, % + lastName + %);
Query query = new QueryByCriteria(Person.class, crit);
try {
broker is a field in your class?
here you get a new instance, what about the
previous referenced PB instance? Do multiple
threads access class instance?
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(), person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
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RE: PB error when the browser is stoped
Hi,
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 11:46
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi,
[EMAIL PROTECTED] wrote:
Hello Armin,
I'm using OJB 0.9.5.
uuh! a real oldtimer ;-)
The code is below.
The stop button is pressed during the execution time of
this method below.
I think that there something wrong because after I press
stop and refresh the page, a
TransactionNotInProgressException occured.
Have you an idea?
Thanks
Sylvain
**code**
public void searchPerson(String lastName) {
Criteria crit = new Criteria();
crit.addLike(lastName, % + lastName + %);
Query query = new QueryByCriteria(Person.class, crit);
try {
broker is a field in your class?
Yes it is.
here you get a new instance, what about the
previous referenced PB instance? Do multiple
threads access class instance?
What do you mean?
Do you mean that if I declare only one class field (broker) I could have threads
problems?
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(), person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
-
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Re: PB error when the browser is stoped
Hi again,
[EMAIL PROTECTED] wrote:
...
here you get a new instance, what about the
previous referenced PB instance? Do multiple
threads access class instance?
What do you mean?
Do you mean that if I declare only one class field (broker) I
could have threads problems?
Exactly! If different threads share/use the same class instance.
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(), person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
If the exception really caused by
broker.abort in searchPerson(String lastName),
don't use the class field broker in your search method
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
and repeat your test.
regards,
Armin
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
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-
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RE: PB error when the browser is stoped
Hi again Armin
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 12:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi again,
[EMAIL PROTECTED] wrote:
...
here you get a new instance, what about the
previous referenced PB instance? Do multiple
threads access class instance?
What do you mean?
Do you mean that if I declare only one class field (broker) I
could have threads problems?
Exactly! If different threads share/use the same class instance.
Just some question to be sure to understand:
How could you define a thread in this case?
Do you say that all threads use the same class instance?
If I declare each time a new PB instance, is this solution thread safe?
Thanks
Sylvain
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(), person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
If the exception really caused by
broker.abort in searchPerson(String lastName),
don't use the class field broker in your search method
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
and repeat your test.
regards,
Armin
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
-
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RE: PB error when the browser is stoped
Hi Sylvain,
snip
Just some question to be sure to understand:
How could you define a thread in this case?
The servlet engine uses parallel WorkerThreads to handle all incoming
requests.
So you have to make sure that parallel servlet threads don't access the
broker variable without proper synchronization.
Do you say that all threads use the same class instance?
If you mean Class object then yes,
If you mean instance of a class then no.
If I declare each time a new PB instance, is this solution
thread safe?
You have to make sure that each thread (also servlet engine threads) always
work with their only broker instance and not with a shared instance.
The most simple way to achieve this is to use a new PB instance in each
call.
Of course it's important to close the PB imediately after the unit of work
is completed
cheers,
Thomas
Thanks
Sylvain
broker = PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(), person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
If the exception really caused by
broker.abort in searchPerson(String lastName),
don't use the class field broker in your search method
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
and repeat your test.
regards,
Armin
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the
transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
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RE: PB error when the browser is stoped
Hi Thomas,
-Message d'origine-
De: Mahler Thomas [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 14:17
À: 'OJB Users List'
Objet: RE: PB error when the browser is stoped
Hi Sylvain,
snip
Just some question to be sure to understand:
How could you define a thread in this case?
The servlet engine uses parallel WorkerThreads to handle all incoming
requests.
So you have to make sure that parallel servlet threads don't
access the
broker variable without proper synchronization.
How could I be sure?
How do you mean about proper synchronization?
Do you say that all threads use the same class instance?
If you mean Class object then yes,
If you mean instance of a class then no.
I don't understand what you mean? What's the difference between a Class object and an
instance of a Class?
If I declare each time a new PB instance, is this solution
thread safe?
You have to make sure that each thread (also servlet engine
threads) always
work with their only broker instance and not with a shared instance.
The most simple way to achieve this is to use a new PB
instance in each
call.
OK. You declare eache time a new PB instance like:
PersistenceBroker pb = PersistenceBrokerFactory
Thanks
Sylvain
Of course it's important to close the PB imediately after the
unit of work
is completed
cheers,
Thomas
Thanks
Sylvain
broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
broker.beginTransaction();
Iterator iter = broker.getIteratorByQuery(query);
while (iter.hasNext()) {
Person person = (Person) iter.next();
appResps.put(person.getPersonId(),
person.getPersonName());
}
broker.commitTransaction();
} catch (PersistenceBrokerException t) {
broker.abortTransaction();
t.printStackTrace();
} finally {
broker.close();
}
hmm, I'm not familiar with webserver internals, but think if
you press 'stop' on the browser your method will be pass
through anyway.
StackTrace of the exception on refresh?
Caused by 'broker.abortTransaction()'?
If yes, I think it's a thread problem.
How could I test it?
If the exception really caused by
broker.abort in searchPerson(String lastName),
don't use the class field broker in your search method
recommened to use
PersistenceBroker pb = PersistenceBrokerFactory
in your methods
and repeat your test.
regards,
Armin
Regards
Sylvain
regards,
Armin
}
**code**
-Message d'origine-
De: Armin Waibel [mailto:[EMAIL PROTECTED]
Date: mercredi, 5. novembre 2003 10:22
À: OJB Users List
Objet: Re: PB error when the browser is stoped
Hi Sylvain,
[EMAIL PROTECTED] wrote:
Hello,
I'using PB intances to retrieve info from my database.
When the time to search information is too long you can
press the stop button on the browser.
But when I restart my application there is a
TransactionNotInProgress exception.
Maybe the PB instance isn't closed when I stop the
transaction!??
How could I close the PB intansce when I stop the browser?
How could I manage this?
Is someone has an experience?
Can you describe more detailed, some pseudo code?
Which version do you use?
regards,
Armin
Thanks
Sylvain
-
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