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RE: [JBoss-user] transactions & synchronizations

2003-07-10 Thread Jeremy Boynes 
There are a couple of solutions to this:
1) The finder takes a 'update-intent', basically exclusive, lock in the
database.
   A fix that does this has been vetoed by Bill Burke, although you can
implement it
   yourself with BMP or by using database-specific  for
the finder.

2) Leave the finder running with a Read-Committed isolation level and
have the entity
   implementation deal with the phantom case by checking that the
current values match 
   the values that caused the object to be returned by the finder. In
other words,
   check that foo is still null when you try and set it to bar and if
not throw an 
   exception indicating concurrent modification.

Jeremy

/*
 * Jeremy Boynes
 * Partner
 * Core Developers Network
 */ 

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of 
> Ittay Dror
> Sent: Thursday, July 10, 2003 12:39 PM
> To: JBoss-User
> Subject: [JBoss-user] transactions & synchronizations
> 
> 
> Say I have the following case:
> 
> 1. a session bean queries with ejb ql for entity beans with a 
> specific property value. name the property 'foo' and the 
> value 'bar'. It queries the entities whose foo property is 
> null, selects the first and sets its value to bar
> 
> 2. two threads call the session bean:
>a. thread-a does the query, gets an entity, changes its 
> value to bar.
>b. in the meanwhile, thread-b also does the same and 
> therefore gets the same entity bean.
> 
> 3. say the session bean's method is synchronized (inside of 
> it, there is a synchroniztion). this doesn't help, since 
> jboss only commits the changes once the method returns, so 
> when thread-a steps out of the synchronization block, 
> thread-b steps in, before jboss commits the changes.
> 
> what is the solution to this? transactions? (i've tried 
> RequiresNew, with no luck) or syncrhonizing before the call 
> to the session bean (rather than in it)? this means every 
> client needs to add this synchronization..
> 
> please help,
> thank you,
> ittay
> -- 
> ===
> Ittay Dror ([EMAIL PROTECTED])
> User Space, R&D
> Qlusters Inc.
> Tel: +972-3-6081956 Fax: +972-3-6081841
> 
> 
> 
> ---
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RE: [JBoss-user] JMS behind a firewall.

2003-07-10 Thread Sebastian Hauer 

Hi William,

> connection after sending the message.  When we use the UIL 
> invocation layer, the exception does not occur.  The client 
> is a servlet that establishes a connection each time, sends a 
> message then closes out the connection.  Are clients only 
> allowed to establish one connection with the UIL2 layer?
> 
>  - Destroying failedjavax.jms.JMSException: The destination 
> is being used.
>   at 
> org.jboss.mq.server.JMSDestinationManager.closeDestination(JMS
> DestinationManager.java:804)
>   at 
> org.jboss.mq.server.jmx.DestinationMBeanSupport.destroyService
> (DestinationMBeanSupport.java:122)

Not that I know of, you should be able to open as may connection as you
want.
Can you show some code how you open and use the connection?

Regards,
Sebastian


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[JBoss-user] Re: Strange behavior when changing bean properties

2003-07-10 Thread Ittay Dror 
i also run select statements on the table myself and see that the
property is indeed not null when the query is executed (before and
after).

On Thu, 2003-07-10 at 19:49, Ittay Dror wrote:
> Simply put, I change a property of a bean, I see it changes in the DB,
> but JBoss thinks the property hasn't changed.
> 
> Details:
> 1. I have a bean, I change an integer property of it from null to some
> number. In the debugger, if I inspect the property (bean.getFoo()), I
> get the number.
> 2. Shortly after, I query for all beans whose property is not null. I
> get the same bean as before in the results. In the debugger, when I
> inspect the property, I get null.
> 3. When I look in the DB log files, I see there is a call to 'update'
> with the right value for the property (the number), there is no 'update'
> to set the property to null. 
> 4. If I get the query from the DB log files and run it myself, the row
> for which the property has changed is not returned.
> 
> 
> 
> Thank you,
> Ittay
-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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[JBoss-user] transactions & synchronizations

2003-07-10 Thread Ittay Dror 
Say I have the following case:

1. a session bean queries with ejb ql for entity beans with a specific
property value. name the property 'foo' and the value 'bar'. It queries
the entities whose foo property is null, selects the first and sets its
value to bar

2. two threads call the session bean:
   a. thread-a does the query, gets an entity, changes its value to bar.
   b. in the meanwhile, thread-b also does the same and therefore gets
the same entity bean.

3. say the session bean's method is synchronized (inside of it, there is
a synchroniztion). this doesn't help, since jboss only commits the
changes once the method returns, so when thread-a steps out of the
synchronization block, thread-b steps in, before jboss commits the
changes.

what is the solution to this? transactions? (i've tried RequiresNew,
with no luck) or syncrhonizing before the call to the session bean
(rather than in it)? this means every client needs to add this
synchronization..

please help,
thank you,
ittay
-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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[JBoss-user] Re: Strange behavior when changing bean properties

2003-07-10 Thread Ittay Dror 
ok, i think i found the bug. two threads try to use the (stateless)
session bean. although there is synchronization inside it (in the class
level), jboss doesn't update its interal data till after the call to the
session bean returns. 

1. thread-a calls the session bean (through a local interface)
2. the call reaches the bean implementation
3. thread-b calls the session bean
4. the call reaches the bean implementation, but doesn't go further
since there is synchronization
5. thread-a executes the code, changing the property
6. thread-b enters the synchronized block and executes the query
7. thread-a returns from the method, where jboss closes the transaction,
updating its internal data.
8. thread-b works with an old data!

is this an accurate description?

how can i overcome this in a j2ee manner?

thank you,
ittay

On Thu, 2003-07-10 at 21:20, Ittay Dror wrote:
> i forgot to mention the query is dynamic-ql. maybe it has some relevance
> 
> On Thu, 2003-07-10 at 19:49, Ittay Dror wrote:
> > Simply put, I change a property of a bean, I see it changes in the DB,
> > but JBoss thinks the property hasn't changed.
> > 
> > Details:
> > 1. I have a bean, I change an integer property of it from null to some
> > number. In the debugger, if I inspect the property (bean.getFoo()), I
> > get the number.
> > 2. Shortly after, I query for all beans whose property is not null. I
> > get the same bean as before in the results. In the debugger, when I
> > inspect the property, I get null.
> > 3. When I look in the DB log files, I see there is a call to 'update'
> > with the right value for the property (the number), there is no 'update'
> > to set the property to null. 
> > 4. If I get the query from the DB log files and run it myself, the row
> > for which the property has changed is not returned.
> > 
> > 
> > 
> > Thank you,
> > Ittay
-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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[JBoss-user] Strange behavior when changing bean properties

2003-07-10 Thread Ittay Dror 
Simply put, I change a property of a bean, I see it changes in the DB,
but JBoss thinks the property hasn't changed.

Details:
1. I have a bean, I change an integer property of it from null to some
number. In the debugger, if I inspect the property (bean.getFoo()), I
get the number.
2. Shortly after, I query for all beans whose property is not null. I
get the same bean as before in the results. In the debugger, when I
inspect the property, I get null.
3. When I look in the DB log files, I see there is a call to 'update'
with the right value for the property (the number), there is no 'update'
to set the property to null. 
4. If I get the query from the DB log files and run it myself, the row
for which the property has changed is not returned.



Thank you,
Ittay
-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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[JBoss-user] Re: Strange behavior when changing bean properties

2003-07-10 Thread Ittay Dror 
i forgot to mention the query is dynamic-ql. maybe it has some relevance

On Thu, 2003-07-10 at 19:49, Ittay Dror wrote:
> Simply put, I change a property of a bean, I see it changes in the DB,
> but JBoss thinks the property hasn't changed.
> 
> Details:
> 1. I have a bean, I change an integer property of it from null to some
> number. In the debugger, if I inspect the property (bean.getFoo()), I
> get the number.
> 2. Shortly after, I query for all beans whose property is not null. I
> get the same bean as before in the results. In the debugger, when I
> inspect the property, I get null.
> 3. When I look in the DB log files, I see there is a call to 'update'
> with the right value for the property (the number), there is no 'update'
> to set the property to null. 
> 4. If I get the query from the DB log files and run it myself, the row
> for which the property has changed is not returned.
> 
> 
> 
> Thank you,
> Ittay
-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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Re: [JBoss-user] ServiceMBean with initial state of STOPPED

2003-07-10 Thread Scott M Stark 
No. Such a service should be fronted by a StateMachineService that brings
the contained/managed services to whatever state is approriate.
--

Scott Stark
Chief Technology Officer
JBoss Group, LLC

Eric Jain wrote:

Is it possible to have a ServiceMBean created automatically at startup
without actually starting it? Something like:

--
Eric Jain


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Re: [JBoss-user] entityContext.getEJBLocalObject() returns local interface of another object

2003-07-10 Thread Alexey Loubyansky 
Hello Alexey,

what about other fields? Do their values correspond to the context
with the expected primary key or to the context that is actually
present?

When do you perform the check?
More details would really be appreciated.

Thank you,
alex

Thursday, July 10, 2003, 5:04:06 PM, Alexey Yudichev wrote:

AY> I am using Jboss 3.2.1
AY> Sometimes entityContext.getEJBLocalObject() returns local interface of another 
instance of the same entity bean.

AY> I have a superclass for all my entities in application which implements 
EntityBean's setEntityContext() method and saves entityContext in a field.
AY> Inside one of business methods of one of entity beans I check if a primary key 
constructed from key CMP field(s) matches a primary key obtained from
AY> entityContext.getEJBLocalObject().getPrimaryKey(). Sometimes they do not match: 
entityContext.getEJBLocalObject().getPrimaryKey() returns primary key of another 
instance of the same entity bean.

AY> I have sometimes situations when user is logged in as one customer and enjoys 
privileges of another...

AY> This happens ~20 times a day with a particular single object for me... I could 
install some kind of bug trap logging some debug info to help fix the bug.



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RE: [JBoss-user] sync-on-commit-only

2003-07-10 Thread Jeremy Boynes 
This causes the container to flush e.g. before executing finders, which
is required (and often desired) behaviour. Setting this to true will
mean finders will not be aware of any modifications already made in the
transaction. I'd recommend leaving it at false unless you know that your
application can handle this, or unless you do many find/modify cycles on
a single instance in a single transaction.

Jeremy

/*
 * Jeremy Boynes
 * Partner
 * Core Developers Network
 */ 

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of 
> Corby Page
> Sent: Thursday, July 10, 2003 9:45 AM
> To: [EMAIL PROTECTED]
> Subject: [JBoss-user] sync-on-commit-only
> 
> 
> Assuming your entity beans are enlisted in a transaction, is 
> there any reason ever to leave this option set to false?
> 
> Thanks,
> Corby
> 
> 
> 
> 
> ---
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[JBoss-user] JBoss Featured in Out-of-the-Box Open Source distribution

2003-07-10 Thread Rod Cope 
JBoss 3.2.1 is included in Out-of-the-Box 2.1, an intelligent distribution
of over 100 Open Source projects for Java developers on both Linux and
Windows.

Major changes from 2.0:
  * Added Oracle and DB2 integration for JBoss and the sample projects
  * Semi-automatic database switching for JBoss and the samples after
installation
  * Support for Red Hat, SuSE, and Mandrake Linux (in addition to Windows
XP/2000)
  * Added PHP, phpMyAdmin, and phpBB for LAMP developers
  * Dozens of project updates, including JBoss, Apache, Struts, Hibernate,
MySQL, PostgreSQL, etc.

The free Community Edition is fully functional, does not expire, and does
not require registration.  It installs just over 25 of the 100+ projects,
including JBoss, MySQL, and Castor, and comes with the Castor sample project
and nearly all of the Enterprise Edition documentation.

Please visit http://www.ejbsolutions.com for details or to download the free
Community Edition.

Thanks,
Rod


Rod Cope
EJB Solutions, Inc.
[EMAIL PROTECTED]




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[JBoss-user] sync-on-commit-only

2003-07-10 Thread Corby Page 
Assuming your entity beans are enlisted in a transaction, is there any
reason ever to leave this option set to false?

Thanks,
Corby




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[JBoss-user] JBoss, JMX, and Xdoclet

2003-07-10 Thread Keene Hammond 
Hi all,
Can I deploy multiple instances of a "mbean" via the @jmx tags using 
xdoclet?

What I need is this;

...
 ...



...

...

I am using;

/**
* @jmx.mbean name="PAYCHEX:service=ldap/writepool,jndiName=ldap/writePool"
** @jboss.service servicefile="jboss"
*/
public class LDAPConnectionPool
...
Which generates this;

...

...

...

Oh yes, I am using,
M$ Windows XP, Sun JDK 1.4.2 JBoss 3.2.1, Ecplise 2.11, JBoss IDE 1.1.0.
Thanks in advance...
-Keene
--
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The information contained in this message may be privileged, confidential, and protected from disclosure. If the reader of this message is not the intended recipient, or any employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. 

Thank you. Paychex, Inc.



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RE: [JBoss-user] JMS behind a firewall.

2003-07-10 Thread Lyvers, William 
Thanks,
We have the Http invoker layer working, but we are getting the following exception 
when using the UIL2 invocation layer.  It looks to be occurring when the client tries 
to close the connection after sending the message.  When we use the UIL invocation 
layer, the exception does not occur.  The client is a servlet that establishes a 
connection each time, sends a message then closes out the connection.  Are clients 
only allowed to establish one connection with the UIL2 layer?

 - Destroying failedjavax.jms.JMSException: The destination is being used.
at 
org.jboss.mq.server.JMSDestinationManager.closeDestination(JMSDestinationManager.java:804)
at 
org.jboss.mq.server.jmx.DestinationMBeanSupport.destroyService(DestinationMBeanSupport.java:122)
at org.jboss.system.ServiceMBeanSupport.destroy(ServiceMBeanSupport.java:271)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at 
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at 
org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:966)
at $Proxy11.destroy(Unknown Source)
at org.jboss.system.ServiceController.destroy(ServiceController.java:521)
at org.jboss.system.ServiceController.destroy(ServiceController.java:513)
at org.jboss.system.ServiceController.destroy(ServiceController.java:513)
at org.jboss.system.ServiceController.destroy(ServiceController.java:513)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at 
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.destroy(Unknown Source)
at org.jboss.deployment.SARDeployer.destroy(SARDeployer.java:424)
at org.jboss.deployment.MainDeployer.destroy(MainDeployer.java:530)
at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:481)
at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:475)
at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:448)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at 
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy7.undeploy(Unknown Source)
at 
org.jboss.deployment.scanner.URLDeploymentScanner.undeploy(URLDeploymentScanner.java:310)
at 
org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:406)
at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:200)
at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:211)
at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:190)


-Original Message-
From: Sebastian Hauer [mailto:[EMAIL PROTECTED]
Sent: Tuesday, July 08, 2003 6:37 PM
To: [EMAIL PROTECTED]
Subject: RE: [JBoss-user] JMS behind a firewall.


Hi Billy,

You can tunnel all your RMI calls through HTTP/S, this would include
JNDI lookup calls. So you would only need one port for that and than use
something like UIL or better UIL2 for JMS which will also need just one
port.
We have a setup like this in production using JBoss 3.0.x.

Regards,
Sebastian


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[JBoss-user] ServiceMBean with initial state of STOPPED

2003-07-10 Thread Eric Jain 
Is it possible to have a ServiceMBean created automatically at startup
without actually starting it? Something like:



--
Eric Jain



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Re: [JBoss-user] Update to JBoss 3.2.1 documentation

2003-07-10 Thread Scott M Stark 
Figure 5-8 i only shows the instance-pool and container-pool-conf elements. You 
have to go through all of the Container configuration information to cover all 
of the elements shown in the Listing 5-8 example.

--

Scott Stark
Chief Technology Officer
JBoss Group, LLC

Poppe, Troy wrote:

Just a minor editorial request for the JBoss 3.2.1 docs.

Figure 5-8 appears to be missing the commit-option, and several other tags as
they appear in Listing 5-8.
T


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Re[2]: [JBoss-user] How to get reference to XMBean

2003-07-10 Thread julien viet 
and you can have the xmbean name by implementing the MBeanRegistration interface
on the managed resource.

SMS> Querying the MBeanRegistry should work:

SMS> import javax.management.ObjectName;
SMS> import org.jboss.mx.server.ServerConstants;
SMS> import org.jboss.mx.server.registry.MBeanEntry;
SMS> import org.jboss.mx.server.registry.MBeanRegistry;

SMS> Object[] args = {xmbeanName};
SMS> String[] sig = {ObjectName.class.getName()}
SMS> MBeanEntry entry = (MBeanEntry)
SMS> mbeanServer.invoke(ServerConstants.MBEAN_REGISTRY, "get", args, sig);
SMS> Object xmbean = entry.getResourceInstance();




-- 
Best regards,
 julienmailto:[EMAIL PROTECTED]



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[JBoss-user] entityContext.getEJBLocalObject() returns local interface of another object

2003-07-10 Thread Alexey Yudichev 
I am using Jboss 3.2.1
Sometimes entityContext.getEJBLocalObject() returns local interface of another 
instance of the same entity bean.

I have a superclass for all my entities in application which implements EntityBean's 
setEntityContext() method and saves entityContext in a field.
Inside one of business methods of one of entity beans I check if a primary key 
constructed from key CMP field(s) matches a primary key obtained from 
entityContext.getEJBLocalObject().getPrimaryKey(). Sometimes they do not match: 
entityContext.getEJBLocalObject().getPrimaryKey() returns primary key of another 
instance of the same entity bean.

I have sometimes situations when user is logged in as one customer and enjoys 
privileges of another...

This happens ~20 times a day with a particular single object for me... I could install 
some kind of bug trap logging some debug info to help fix the bug.


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Re: [JBoss-user] How to get reference to XMBean

2003-07-10 Thread Scott M Stark 
Querying the MBeanRegistry should work:

import javax.management.ObjectName;
import org.jboss.mx.server.ServerConstants;
import org.jboss.mx.server.registry.MBeanEntry;
import org.jboss.mx.server.registry.MBeanRegistry;
   Object[] args = {xmbeanName};
   String[] sig = {ObjectName.class.getName()}
   MBeanEntry entry = (MBeanEntry)
mbeanServer.invoke(ServerConstants.MBEAN_REGISTRY, "get", args, sig);
   Object xmbean = entry.getResourceInstance();
--

Scott Stark
Chief Technology Officer
JBoss Group, LLC

Eric Jain wrote:

Is there any way to get a reference from within a managed object to the
surounding XMBean? The managed object is an MBean and may in rare cases
need to modify the MBeanInfo provided by the XMBean on its behalf.
--
Eric Jain


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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Ittay Dror 
On Thu, 2003-07-10 at 15:10, Stephen Davidson wrote:
> Hi Ittay.
> 
> I think what Alex meant is that in this case, the Entity should
> have the file contents as its value.  This is a trick I have
> pulled a couple of times.
> 
> The other option, why don't you open the file as "Locked",
> so that some other software application in the OS can't do
> anything while you are working on this file?

thank you for your suggestions, however, the writing to file is an
example only. imagine that instead of writing to a file, i want to
interact with another application or do some other work, for example,
change some entries in a singleton (a regular object). this work should
not (in my opinion) be done in the entity bean, since this is not
persistence related. 

thanx,
ittay

> 
> Regards,
> Steve
> 
> Ittay Dror wrote:
> > On Thu, 2003-07-10 at 11:42, Alexey Loubyansky wrote:
> > 
> >>Hello Ittay,
> >>
> >>JBoss can lock the entity bean for you.
> >>If you use the default container configuration (Standard CMP 2.x
> >>EntityBean) and don't mark the methods in the entity bean as
> >>read-only, once entity's method is called, the entity is locked and
> >>other transactions will wait for lock release. The lock will be
> >>released when the tx that put the lock ends.
> > 
> > 
> > i know about this, but that is not what i need. i need to lock the
> > operations that *use* the entity, not the operations *of* the entity. in
> > the example i gave, imagine i have a file and i want to add a line with
> > the properties of the enitity. if i read the properties one by one and
> > write them to the file, then there's a chance that some other thread
> > will do the same and the result will be undetermined. basically, i want
> > to know that while i'm reading / changing the properties of the entity
> > no other thread is doing the same. 
> > 
> > 
> > 
> >>alex
> >>
> >>Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:
> >>
> >>ID> say i have a session bean that does some work that is not ejb related.
> >>ID> for example, it creates a file with some data. the data in the file is
> >>ID> based on the contents of an entity bean. now, i want to synchronize on
> >>ID> the entity bean so that two sessio beans will not write to the file
> >>ID> simultaniously. how can i do that? can i do 'synchronize (entityBean)'?
> >>ID> or do i need to create some map from the entityBean's primary key to an
> >>ID> object for locking on it? or is there another way? (the data file is for
> >>ID> example only, so a solution of locking on the file is not good).
> >>
> >>ID> thank you,
> >>ID> Ittay
> >>
> >>
> >>
> >>---
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-- 
===
Ittay Dror ([EMAIL PROTECTED])
User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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Re: [JBoss-user] Q. on size of data marshalled!!!

2003-07-10 Thread Scott M Stark 
See the the explanation of IllegalAccessErrors in the class loading docs 
available from sourceforge under the docs tab.

--

Scott Stark
Chief Technology Officer
JBoss Group, LLC

Muraly R wrote:

Scott, then regarding the second error you mentioned on class 
loader, I am not able to get it clear.
18:01:00,395 ERROR [String] JobTask:run() - Throwble.
try to access method 
com.cisco.nm.qpm.server.util.scheduler.TimerManager.removeOnceSchedule(Ljava/util/TimerTask;)V 
from class com.cisco.nm.qpm.server.util.scheduler.JobTask
18:01:00,411 ERROR [STDERR] java.lang.IllegalAccessError: try to access 
method 
com.cisco.nm.qpm.server.util.scheduler.TimerManager.removeOnceSchedule(Ljava/util/TimerTask;)V 
from class com.cisco.nm.qpm.server.util.scheduler.JobTask

Actually this error was not there when using 3.0.4. After moving to 
3.0.7 it started appearing. The issue with the access modifer. But I 
checked the access modifier. Its OK. i.e both the classes JobTask and 
TimerManager are in the same package and removeOnceSchedule() is having 
protected.

Could you please expalin?

Thanks
Muraly


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Re: [JBoss-user] New to JBoss......

2003-07-10 Thread Nicholas 

Here are some on line tutorials:

http://www.dsg.cs.tcd.ie/~dowlingj/teaching/ds/tutorials/ejb/jboss_3_intro.htm
http://iris.cs.byu.edu/tim/462/tutorial/tutorial.html
http://www7b.software.ibm.com/wsdd/techjournal/0302_koo/koo.html
http://www.ammai.com/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=6&page=1
http://www.uniforum.chi.il.us/slides/beginning_ejb/Introduction_To_Entity_Beans_with_JBoss.pdf
http://www.stanford.edu/~mdelgado/jboss/
http://www.pubbitch.org/jboss/
http://sourceforge.net/projects/xpetstore/  < Not
really a tutorial but lots of XDocleted source code
for JBoss.

//Nicholas







There is also an O'Reilly JBoss workbook, but the link
from the JBoss site seems to be broken right now.


--- s chakradhar <[EMAIL PROTECTED]> wrote:
> Hi.. all,
> 
> I am very new to the JBoss application server. I
> used
> to work with Weblogic previously. Please anyone can
> help me in finding the documentation & examples for
> JBoss to work with(I think..there is very less
> documentation & details  available..for JBoss as
> compared to weblogic..)
> 
> thanks in advance...
> 
> regards
> chakradhar
> 
> __
> Do you Yahoo!?
> SBC Yahoo! DSL - Now only $29.95 per month!
> http://sbc.yahoo.com
> 
> 
>
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=
Nicholas Whitehead
Home: (973) 377 9335
Cell: (201) 615 2716
[EMAIL PROTECTED]
Get Your News From The Crowbar: http://crowbar.dnsalias.com:443/crowbar/


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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Scott M Stark 
If only one thread and one transaction can be active in an entity bean, which is 
what the default pessimistic locking does, you obtain the behavior you want.

--

Scott Stark
Chief Technology Officer
JBoss Group, LLC

Ittay Dror wrote:

i know about this, but that is not what i need. i need to lock the
operations that *use* the entity, not the operations *of* the entity. in
the example i gave, imagine i have a file and i want to add a line with
the properties of the enitity. if i read the properties one by one and
write them to the file, then there's a chance that some other thread
will do the same and the result will be undetermined. basically, i want
to know that while i'm reading / changing the properties of the entity
no other thread is doing the same. 





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[JBoss-user] Update to JBoss 3.2.1 documentation

2003-07-10 Thread Poppe, Troy 

Just a minor editorial request for the JBoss 3.2.1 docs.

Figure 5-8 appears to be missing the commit-option, and several other tags as
they appear in Listing 5-8.

T



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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Dietmar Posselt 
Hi Stephen,

As Ittay wrote, the file access is only an example.

I think we might come to a similar problem. In our case we have
a cluster with the same JMS queue on each node (so we can send
messages even if some nodes in the cluster are down). At a different
division we have one jboss with one remote message driven
bean for any queue/node on the cluster (that makes several MDBs
that might receive messages concurrently).
Now if we want to serialize these messages we need a session
bean with serialization. This is as far as i understand the same
problem as Ittay has.
Serialization might be necessary to trigger some external actions
via sockets or rmi.
Grtnx,
   Dietmar
Stephen Davidson wrote:

Hi Ittay.

I think what Alex meant is that in this case, the Entity should
have the file contents as its value.  This is a trick I have
pulled a couple of times.
The other option, why don't you open the file as "Locked",
so that some other software application in the OS can't do
anything while you are working on this file?
Regards,
Steve
Ittay Dror wrote:

On Thu, 2003-07-10 at 11:42, Alexey Loubyansky wrote:

Hello Ittay,

JBoss can lock the entity bean for you.
If you use the default container configuration (Standard CMP 2.x
EntityBean) and don't mark the methods in the entity bean as
read-only, once entity's method is called, the entity is locked and
other transactions will wait for lock release. The lock will be
released when the tx that put the lock ends.


i know about this, but that is not what i need. i need to lock the
operations that *use* the entity, not the operations *of* the entity. in
the example i gave, imagine i have a file and i want to add a line with
the properties of the enitity. if i read the properties one by one and
write them to the file, then there's a chance that some other thread
will do the same and the result will be undetermined. basically, i want
to know that while i'm reading / changing the properties of the entity
no other thread is doing the same.

alex

Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:

ID> say i have a session bean that does some work that is not ejb 
related.
ID> for example, it creates a file with some data. the data in the 
file is
ID> based on the contents of an entity bean. now, i want to 
synchronize on
ID> the entity bean so that two sessio beans will not write to the file
ID> simultaniously. how can i do that? can i do 'synchronize 
(entityBean)'?
ID> or do i need to create some map from the entityBean's primary 
key to an
ID> object for locking on it? or is there another way? (the data 
file is for
ID> example only, so a solution of locking on the file is not good).

ID> thank you,
ID> Ittay


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[JBoss-user] New to JBoss......

2003-07-10 Thread s chakradhar 
Hi.. all,

I am very new to the JBoss application server. I used
to work with Weblogic previously. Please anyone can
help me in finding the documentation & examples for
JBoss to work with(I think..there is very less
documentation & details  available..for JBoss as
compared to weblogic..)

thanks in advance...

regards
chakradhar

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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Stephen Davidson 
Hi Ittay.

I think what Alex meant is that in this case, the Entity should
have the file contents as its value.  This is a trick I have
pulled a couple of times.
The other option, why don't you open the file as "Locked",
so that some other software application in the OS can't do
anything while you are working on this file?
Regards,
Steve
Ittay Dror wrote:
On Thu, 2003-07-10 at 11:42, Alexey Loubyansky wrote:

Hello Ittay,

JBoss can lock the entity bean for you.
If you use the default container configuration (Standard CMP 2.x
EntityBean) and don't mark the methods in the entity bean as
read-only, once entity's method is called, the entity is locked and
other transactions will wait for lock release. The lock will be
released when the tx that put the lock ends.


i know about this, but that is not what i need. i need to lock the
operations that *use* the entity, not the operations *of* the entity. in
the example i gave, imagine i have a file and i want to add a line with
the properties of the enitity. if i read the properties one by one and
write them to the file, then there's a chance that some other thread
will do the same and the result will be undetermined. basically, i want
to know that while i'm reading / changing the properties of the entity
no other thread is doing the same. 



alex

Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:

ID> say i have a session bean that does some work that is not ejb related.
ID> for example, it creates a file with some data. the data in the file is
ID> based on the contents of an entity bean. now, i want to synchronize on
ID> the entity bean so that two sessio beans will not write to the file
ID> simultaniously. how can i do that? can i do 'synchronize (entityBean)'?
ID> or do i need to create some map from the entityBean's primary key to an
ID> object for locking on it? or is there another way? (the data file is for
ID> example only, so a solution of locking on the file is not good).
ID> thank you,
ID> Ittay


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[JBoss-user] Re: How to get reference to XMBean

2003-07-10 Thread Eric Jain 
> I agree, but that would be specific to the xmbean implementation.
> usually a managed resource is not aware of the surrounding model
> mbean.
>
> That might be done with a specific interface in jboss mx, like
>
> interface XMBeanAware
> {
> void setXMBean(XMBean xmbean);
> }

Yes, that would seem like a good approach. I opened a feature request on
SourceForge...

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Re: [JBoss-user] How to get reference to XMBean

2003-07-10 Thread julien viet 
I agree, but that would be specific to the xmbean implementation.
usually a managed resource is not aware of the surrounding model mbean.

That might be done with a specific interface in jboss mx, like

interface XMBeanAware
{
void setXMBean(XMBean xmbean);
}

julien

Thursday, July 10, 2003, 12:02:04 PM, you wrote:

EJ> Is there any way to get a reference from within a managed object to the
EJ> surounding XMBean? The managed object is an MBean and may in rare cases
EJ> need to modify the MBeanInfo provided by the XMBean on its behalf.

EJ> --
EJ> Eric Jain



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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Ittay Dror 
On Thu, 2003-07-10 at 11:42, Alexey Loubyansky wrote:
> Hello Ittay,
> 
> JBoss can lock the entity bean for you.
> If you use the default container configuration (Standard CMP 2.x
> EntityBean) and don't mark the methods in the entity bean as
> read-only, once entity's method is called, the entity is locked and
> other transactions will wait for lock release. The lock will be
> released when the tx that put the lock ends.

i know about this, but that is not what i need. i need to lock the
operations that *use* the entity, not the operations *of* the entity. in
the example i gave, imagine i have a file and i want to add a line with
the properties of the enitity. if i read the properties one by one and
write them to the file, then there's a chance that some other thread
will do the same and the result will be undetermined. basically, i want
to know that while i'm reading / changing the properties of the entity
no other thread is doing the same. 


> alex
> 
> Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:
> 
> ID> say i have a session bean that does some work that is not ejb related.
> ID> for example, it creates a file with some data. the data in the file is
> ID> based on the contents of an entity bean. now, i want to synchronize on
> ID> the entity bean so that two sessio beans will not write to the file
> ID> simultaniously. how can i do that? can i do 'synchronize (entityBean)'?
> ID> or do i need to create some map from the entityBean's primary key to an
> ID> object for locking on it? or is there another way? (the data file is for
> ID> example only, so a solution of locking on the file is not good).
> 
> ID> thank you,
> ID> Ittay
> 
> 
> 
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[JBoss-user] How to get reference to XMBean

2003-07-10 Thread Eric Jain 
Is there any way to get a reference from within a managed object to the
surounding XMBean? The managed object is an MBean and may in rare cases
need to modify the MBeanInfo provided by the XMBean on its behalf.

--
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RE: [JBoss-user] Linkage error

2003-07-10 Thread Oisin Kim 
Thanks Scott, 
I'll look there next time I have a problem like this...
Regards,
Oisin

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Scott M
Stark
Sent: 09 July 2003 18:15
To: [EMAIL PROTECTED]
Subject: Re: [JBoss-user] Linkage error


3.2 allows for control of the class loading behavior at the ejb-jar,
war, sar 
and ear levels and this is defined in the various dtds in the dist under
docs/dtds. The META-INF/jboss.xml config for the ejb-jar would be
something
like:



http://www.jboss.org/j2ee/dtd/jboss_3_2.dtd";>



   jboss.test:ejb-jar=log4j113-ejb.jar



-- 

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Chief Technology Officer
JBoss Group, LLC





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Re: [JBoss-user] Q. on size of data marshalled!!!

2003-07-10 Thread Muraly R 

Hi Gurus(This time Adrian and Scott ;-),
Thnaks a
TON!!!
You saved
me a day...(PHEW!!!)
The issue
was one of the methods in the Value Object. It was using System.arrayCopy
to assign the recieved array parameter to member array. Instead of this
when just replaced the method with a direct assign everything worked
fine. Not SUre why an arrayCopy() cause such an exception. arrayCopy()
seems to be a efficient method only, right?

Scott,
then regarding the second error you mentioned on class loader, I am not
able to get it clear. 
18:01:00,395 ERROR [String] JobTask:run() - Throwble. 
try to access method
com.cisco.nm.qpm.server.util.scheduler.TimerManager.removeOnceSchedule(Ljava/util/TimerTask;)V
from class com.cisco.nm.qpm.server.util.scheduler.JobTask
18:01:00,411 ERROR [STDERR] java.lang.IllegalAccessError: try to access
method
com.cisco.nm.qpm.server.util.scheduler.TimerManager.removeOnceSchedule(Ljava/util/TimerTask;)V
from class com.cisco.nm.qpm.server.util.scheduler.JobTask

Actually this error was not there when using 3.0.4. After moving to 3.0.7
it started appearing. The issue with the access modifer. But I checked
the access modifier. Its OK. i.e both the classes JobTask and
TimerManager are in the same package and removeOnceSchedule() is having
protected.

Could you please expalin?

Thanks
Muraly

At 10:24 09/07/2003 -0700, you wrote:
This means that an array element being read
from the stream is not
of the type of the array. Attempting to read an Integer into a
String[] would cause this for example. It could also be class 
loader
issue due which seems to exist as seen by the IllegalAccess error.

-- 

Scott Stark
Chief Technology Officer
JBoss Group, LLC


Muraly R wrote:
Hi Adrian,
    Thanks for pointing me in the
right direction...
    I went to the JBoss server log
and the RMI server log(pasted below are the expections). In JBoss server
log there is an java.lang.ArrayStoreException. But I am not able to
understand the exact cause of this.
    If you find anything that may
trigger this scenario, please let me know.
Thanks
Muraly
JBoss server logs
--
17:50:08,297 INFO  [PdpBean] PdpBean::localExecute called
17:50:08,297 INFO  [STDOUT] PdpBean::localExecute called
17:51:15,657 ERROR [STDERR] java.lang.ArrayStoreException
17:51:15,657 ERROR [STDERR] at
java.io.ObjectInputStream.inputArray(Unknown Source)
17:51:15,657 ERROR [STDERR] at
java.io.ObjectInputStream.readObject(Unknown Source)
17:51:15,657 ERROR [STDERR] at
java.io.ObjectInputStream.inputClassFields(Unknown Source)
17:51:15,657 ERROR [STDERR] at
java.io.ObjectInputStream.defaultReadObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.inputObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.readObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.inputClassFields(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.defaultReadObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.inputObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.readObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.inputArray(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.readObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
java.io.ObjectInputStream.readObject(Unknown Source)
17:51:15,673 ERROR [STDERR] at
org.jboss.invocation.MarshalledValue.get(MarshalledValue.java:78)
17:51:15,673 ERROR [STDERR] at
org.jboss.invocation.MarshalledInvocation.getArguments(MarshalledInvocation.java:320)
17:51:15,673 ERROR [STDERR] at
org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:660)
17:51:15,673 ERROR [STDERR] at 



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Re: [JBoss-user] synchronize on a bean

2003-07-10 Thread Alexey Loubyansky 
Hello Ittay,

JBoss can lock the entity bean for you.
If you use the default container configuration (Standard CMP 2.x
EntityBean) and don't mark the methods in the entity bean as
read-only, once entity's method is called, the entity is locked and
other transactions will wait for lock release. The lock will be
released when the tx that put the lock ends.

alex

Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:

ID> say i have a session bean that does some work that is not ejb related.
ID> for example, it creates a file with some data. the data in the file is
ID> based on the contents of an entity bean. now, i want to synchronize on
ID> the entity bean so that two sessio beans will not write to the file
ID> simultaniously. how can i do that? can i do 'synchronize (entityBean)'?
ID> or do i need to create some map from the entityBean's primary key to an
ID> object for locking on it? or is there another way? (the data file is for
ID> example only, so a solution of locking on the file is not good).

ID> thank you,
ID> Ittay



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[JBoss-user] synchronize on a bean

2003-07-10 Thread Ittay Dror 
say i have a session bean that does some work that is not ejb related.
for example, it creates a file with some data. the data in the file is
based on the contents of an entity bean. now, i want to synchronize on
the entity bean so that two sessio beans will not write to the file
simultaniously. how can i do that? can i do 'synchronize (entityBean)'?
or do i need to create some map from the entityBean's primary key to an
object for locking on it? or is there another way? (the data file is for
example only, so a solution of locking on the file is not good).

thank you,
Ittay


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User Space, R&D
Qlusters Inc.
Tel: +972-3-6081956 Fax: +972-3-6081841



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RE: [JBoss-user] Module jms missing from jboss-head

2003-07-10 Thread Sacha Labourey 
Can you try again from http://jboss.sourceforge.net/snapshots/

It seems that last snapshot was somehow aborted as the file was only making
9Mo (the current one makes 35Mo)

Cheers,


sachas

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of 
> Scott M Stark
> Sent: jeudi, 10. juillet 2003 06:41
> To: [EMAIL PROTECTED]
> Subject: Re: [JBoss-user] Module jms missing from jboss-head
> 
> 
> The jms module is the next generation of messaging and is being built
> in jboss-head. You probably need a fresh checkout of 
> jboss-head to pickup its
> content definition as these are not retrieved by an update.
> 
> -- 
> 
> Scott Stark
> Chief Technology Officer
> JBoss Group, LLC
> 
> 
> Alwyn Schoeman wrote:
> 
> > Ok, but why do build/build.sh still fail on trying to build
> > jboss-head/jms?
> > 
> > Or is it possible that my build system is out of date?
> > 
> 
> 
> 
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[JBoss-user] Jboss 3.2.1 - Cascade delete doesn't work for me - Problem solved

2003-07-10 Thread Marco Tedone 
Sorry, I put the cascade-delete option on the wrong part of the
relationship.

Everything works fine now.

Marco
- Original Message - 
From: "Marco Tedone" <[EMAIL PROTECTED]>
To: "JBoss-user-list" <[EMAIL PROTECTED]>
Sent: Wednesday, July 09, 2003 8:40 PM
Subject: Jboss 3.2.1 - Cascade delete doesn't work for me


> Hi, I have two entity beans, People and Address with a relationship of 1
to
> 1. I specified cascade-delete="yes" in the ejb-jar in the People entity
bean
> but it doesn't work. Are you aware about any issue related to this
subject?
>
> Many thanks in advance,
>
> Marco
>





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[JBoss-user] Jboss 3.2.1 - Cascade delete doesn't work for me

2003-07-10 Thread Marco Tedone 
Hi, I have two entity beans, People and Address with a relationship of 1 to
1. I specified cascade-delete="yes" in the ejb-jar in the People entity bean
but it doesn't work. Are you aware about any issue related to this subject?

Many thanks in advance,

Marco





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Re: [JBoss-user] apache to JBoss/Tomcat forwarding

2003-07-10 Thread Ionel Gardais 
Hi,

I look at the mod_jk configuration.

With JBoss3.2.1-Tomcat4.1.24, which directory is considered to be the 
Tomcat root ? I only found a sar file which holds all tomcat files.

If you have experience with mod_jk, is it correct to do :

|Alias /webapps /webapps|

JkMount /webapps/* mainWorker

So *ALL* apps deployed under JBoss could be available through apache ?

Thanks,
ionel


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