[JBoss-user] DB/2 and JBOSS
Hello, I used MySQL the whole time as a database for your EJB-App. Now I moved to DB/2 to see if there are any big problems by switching the database. I use JBoss 2.1. I activated the DB/2 Mapping and JBOSS comes up without any errors, but when I try to create a Entity Bean the EJB-Client and the DB/2 Driver are complaining that the table for this entity beans doesn't exist. But it worked with MySQL where the tables have been created automaticly I wonder why it is not working with DB/2. Has some similiar experience with DB/2. When I look at the database where the tables should be created there is nothing there :-(. Any tips ? Thanks in advance, Frank Marx ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] HOW??
Hi, how can I unsubscribe to this list. I tried two times no "unsubscribe" as a subject of a mail but it didn't work at all :-(. Frank ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] JBOSS TSHIRTS!!!!!! JBOSS MUGS!!!!!
yes and a different design of the hat a different model ... Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of marc fleury Sent: Friday, July 27, 2001 2:58 PM To: [EMAIL PROTECTED] Subject: RE: [JBoss-user] JBOSS TSHIRTS!! JBOSS MUGS! ok so you want black t-shirts instead of white ok... marcf |-Original Message- |From: [EMAIL PROTECTED] |[mailto:[EMAIL PROTECTED]]On Behalf Of Frank Marx |Sent: Friday, July 27, 2001 5:36 PM |To: [EMAIL PROTECTED] |Subject: RE: [JBoss-user] JBOSS TSHIRTS!! JBOSS MUGS! | | | |What I mean is that white t-shirts and this white ugly hat are really |boring, both get dirty very fast. |Maybe something in black or some other colors, maybe have a look at the |stuff from ORACLE or SUN the |things they have are pretty nice. | |Frank | | |___ |JBoss-user mailing list |[EMAIL PROTECTED] |http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] JBOSS TSHIRTS!!!!!! JBOSS MUGS!!!!!
What I mean is that white t-shirts and this white ugly hat are really boring, both get dirty very fast. Maybe something in black or some other colors, maybe have a look at the stuff from ORACLE or SUN the things they have are pretty nice. Frank ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] JBOSS TSHIRTS!!!!!! JBOSS MUGS!!!!!
HI, I have seen the T-Shirts and Mugs and they are far away from pretty, they are just boring. The Hat sucks too a lot. Maybe some different color and design would much be better. Frank ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] IT'S ALIVE!!!!!
Hi Marc, for someone from France you are already pretty american you go girl ... LOL. Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of marc fleury Sent: Tuesday, July 10, 2001 11:07 AM To: Jboss-User@Lists. Sourceforge. Net; Jboss-Development@Lists. Sourceforge. Net Subject: [JBoss-user] IT'S ALIVE! www.jboss.org/forums so go and bang on it, might go down for some maintainance but let's see how much fire we can bring on it. It is Jive/Jetty/JBoss you go girl! bring it on! marcf PS: jboss-user is dead! long live jboss-forums! _ Marc Fleury, Ph.D [EMAIL PROTECTED] _ ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Datasource Lookup from a standalone client
Hi, the question was why I cannot do it ? The question was not why I want to do this without using EJB, the challenge was to find out how can I use JNDI to do that from a standalone JAVA Client which accesses a JNDI Service. But as far as I know now it is possible, because the use of JNDI is not bound to EJB. Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David Jencks Sent: Friday, July 06, 2001 8:10 PM To: [EMAIL PROTECTED] Subject: RE: [JBoss-user] Datasource Lookup from a standalone client Hi, (I am not a jndi expert, so some of the things I say ought to work might not. If I say they won't, I'm pretty sure they won't) There are DataSources and DataSources. Some DataSources simply hand out jdbc1.0 connections, just like calling DriverManager.getConnection, except you can put the configuration info into the datasource bound in jndi. My understanding (possibly wrong) is that when you look one of these up, jndi starts up a DataSource in the vm of the looking up process. I believe for example Borland's InterClient does this. The DataSources in JBoss and implied (as ConnectionFactory's) by the jca spec are a bit more complicated: they are a facade that hands out temporary handles to actual db connections which are pooled and have their transactions managed elsewhere. (IMHO reusing the Connection interface for these is bogus, the transaction control methods shouldn't be there, or at least use the cci LocalTransaction interface). Since Connections usually aren't serializable, and I would hope they wouldn't be, in order to get a connection from one of these facade DataSources, you'd have to start up all the pooling and transaction management machinery in your process's vm in order to use the connection. If you want that much infrastructure running, I think you should be configuring it yourself so you know what you're getting. In fact jca resource adapters do provide an "unmanaged" mode, which is expected to provide by default trivial (no) connection pooling. You might possibly be able to adapt the jbosscx module to deploy a resource adapter (such as a jbosspool wrapped jdbc driver) into your standalone client. However, why would you want to do this? If you aren't using the architecture you get with an ejb framework, why are you bothering with ejb's in the first place? david jencks ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] ejb not bound
Hi,
as far as I know does it know work when you use java:comp/env/ejb under
JBOSS, that is what the documentation online says.
Frank
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of G.L. Grobe
Sent: Friday, July 06, 2001 10:43 AM
To: [EMAIL PROTECTED]
Subject: [JBoss-user] ejb not bound
I'm trying to get a servlet to make a lookup to an ejb's namespace.
I'm not sure if I've got ~/WEB-INF/jboss-web.xml and
~/META-INF/jboss.xml correct. Can someone go over this config to
help me get it working?
Be advised, I'm not even sure if I need all the listed files and
if their in the correct dirs (i.e. jboss.xml, jboss-web.xml).
- jboss server ouput ---
[Auto deploy] linkEjbRefs
[Auto deploy] Linking ejb-ref: ejb/ConfigBuildHome
to JNDI name: null
[Auto deploy] javax.naming.NamingException: ejb-ref:
ejb/ConfigBuildHome, expected jndi-name in jboss-web.xml
[Auto deploy] at org.jboss.web.AbstractWebContainer.linkEjbRefs
(AbstractWebContainer.java:359)
--- servlet lookup to ejb
ConfigBuildHome configBuildHome = (ConfigBuildHome)
javax.rmi.PortableRemoteObject.narrow(
ctx.lookup("java:comp/env/ejb/ConfigBuildHome"),
ConfigBuildHome.class);
- project/web-app/WEB-INF/web.xml --
ejb/ConfigBuildHome
Session
com.neuroquest.cais.ejb.session.configBuild.ConfigBuildHome
com.neuroquest.cais.ejb.session.configBuild.ConfigBuild
project/web-app/META-INF/jboss-web.xml
ejb/ConfigBuildHome
ConfigBuild
- project/META-INF/jboss.xml ---
ConfigBuild
ConfigBuild
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RE: [JBoss-user] Datasource Lookup from a standalone client
Sure I can access a DB from a standalone client using JDBC.
The question was why I cannot access a JNDI to access a Datasource there ?
I mean what is the reason, as far as I know JNDI is a basic service and is
not limited to EJB.
When you look up a home interface of a EJB you can do this from a standalone
client why should this not work
with datasources, I mean at least find the datasource.
Is it not possible to create a namespace under java: or java:comp and put
the datasource there
and look it up ?
Maybe the problem is that the beans are using per default the namespace
java:comp/env and the standalone
client not.
Frank
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Burkhard
Vogel
Sent: Friday, July 06, 2001 4:16 PM
To: [EMAIL PROTECTED]
Subject: Re: [JBoss-user] Datasource Lookup from a standalone client
Let's put it simple:
You can't do it, forget it, stop trying, use beans or servlets for DB
access!!!
Burkhard
- Original Message -----
From: "Frank Marx" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, July 07, 2001 12:01 AM
Subject: RE: [JBoss-user] Datasource Lookup from a standalone client
> HI,
>
> so where has this Datasource to be bound that I can access it from a stand
> alone JAVA Client ?
>
> As far a I understand a datasource (which beans can access) would be bound
> to:
>
> java:comp/env/jdbc/DSource
>
> so how does this have to look like that a stand alone JAVA Client can
> access this Datasource ??
>
> Thanks,
>
> Frank Marx
>
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of
> [EMAIL PROTECTED]
> Sent: Friday, July 06, 2001 2:09 PM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED];
> [EMAIL PROTECTED]
> Subject: Re: [JBoss-user] Datasource Lookup from a standalone client
>
>
>
> You are reading the spec incorrectly. You can only access things from
> remote clients that are present in the Global jndi namespace (to get a
view
> of the namespace, use the jndiView mbean through http://localhost:8082 -
or
> whatever port you have it set on).
>
> You don't want to access the DataSource from a remote client - that would
> require the Connection object to be Serializable
>
> Alex
>
>
>
> |+-->
> || "gsekar ejb"|
> || <[EMAIL PROTECTED]> |
> || Sent by:|
> || [EMAIL PROTECTED]|
> || eforge.net |
> || |
> || |
> || 07/06/01 03:44 PM |
> || Please respond to jboss-user|
> || |
> |+-->
>
>
>---
> |
> |
> |
> | To: [EMAIL PROTECTED]
> |
> | cc:
> |
> | Subject: [JBoss-user] Datasource Lookup from a standalone
> client|
>
>
>---
> |
>
>
>
>
> Version : JBoss-2.2.2
>
> I have defined a JDBC DataSource _pool and i can see that it is
> successfully bound as java:/_pool.
> [_pool] Starting
> [_pool] XA Connection pool _pool bound to java:/_pool
> [_pool] Started
>
> I have no problem accessing this datasource from within a Session Bean
> using
> Context ctx = new InitialContext();
> DataSource ds = ctx.lookup("java:/_pool");
>
> But when I try to access this datasource from a standalone java client, I
> am able to access the Context in the app server correctly and I am able to
> list the bound objects ( This tells me that my jndi.properties is at the
> right place and my client is able to connect to the App Server). But When
I
> do the lookup for DataSource, I get a NamingException with _pool not
> bound. From my understanding of the j2ee spec, I should be able to do this
> lookup. IS this a bug or am I not understanding the spec correctly. Also
> the Context.list doesnt list any of the datasources. It lists only the
> bounf EJB objects.
>
> Thanks
>
> Sekar
>
> P.S. I have dont the same type of client look up in 2 other commercial App
> Servers.
>
>
>
>
> Get 250 color business cards for FREE!
> http://businesscards.lycos.com/vp/fastpath/
>
> __
RE: [JBoss-user] Datasource Lookup from a standalone client
HI,
so where has this Datasource to be bound that I can access it from a stand
alone JAVA Client ?
As far a I understand a datasource (which beans can access) would be bound
to:
java:comp/env/jdbc/DSource
so how does this have to look like that a stand alone JAVA Client can
access this Datasource ??
Thanks,
Frank Marx
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, July 06, 2001 2:09 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED];
[EMAIL PROTECTED]
Subject: Re: [JBoss-user] Datasource Lookup from a standalone client
You are reading the spec incorrectly. You can only access things from
remote clients that are present in the Global jndi namespace (to get a view
of the namespace, use the jndiView mbean through http://localhost:8082 - or
whatever port you have it set on).
You don't want to access the DataSource from a remote client - that would
require the Connection object to be Serializable
Alex
|+-->
|| "gsekar ejb"|
|| <[EMAIL PROTECTED]> |
|| Sent by:|
|| [EMAIL PROTECTED]|
|| eforge.net |
|| |
|| |
|| 07/06/01 03:44 PM |
|| Please respond to jboss-user|
|| |
|+-->
>---
|
|
|
| To: [EMAIL PROTECTED]
|
| cc:
|
| Subject: [JBoss-user] Datasource Lookup from a standalone
client|
>---
|
Version : JBoss-2.2.2
I have defined a JDBC DataSource _pool and i can see that it is
successfully bound as java:/_pool.
[_pool] Starting
[_pool] XA Connection pool _pool bound to java:/_pool
[_pool] Started
I have no problem accessing this datasource from within a Session Bean
using
Context ctx = new InitialContext();
DataSource ds = ctx.lookup("java:/_pool");
But when I try to access this datasource from a standalone java client, I
am able to access the Context in the app server correctly and I am able to
list the bound objects ( This tells me that my jndi.properties is at the
right place and my client is able to connect to the App Server). But When I
do the lookup for DataSource, I get a NamingException with _pool not
bound. From my understanding of the j2ee spec, I should be able to do this
lookup. IS this a bug or am I not understanding the spec correctly. Also
the Context.list doesnt list any of the datasources. It lists only the
bounf EJB objects.
Thanks
Sekar
P.S. I have dont the same type of client look up in 2 other commercial App
Servers.
Get 250 color business cards for FREE!
http://businesscards.lycos.com/vp/fastpath/
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RE: [JBoss-user] InitialContext problem
Hi,
have you checked if the settings in the jndi.properties file are correct ?
Frank
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Larry Kim
Sent: Friday, July 06, 2001 12:32 PM
To: [EMAIL PROTECTED]
Cc: Larry Kim
Subject: [JBoss-user] InitialContext problem
Hello, i am having problems with a test client.
Has anybody seen anything like this?
Exception: Cannot lookup HospitalHome:
javax.naming.NoInitialContextException: Need to specify class name in
environment or system property, or as an applet parameter, or in an
application resource file: java.naming.factory.initial
i deployed a simple entity bean and JBoss server says it is "deployed
successfully".
my test client just does a simple:
InitialContext initialContext = new InitialContext();
System.out.println("got jndi"); // up to here is fine.
HospitalHome home =
(HospitalHome)PortableRemoteObject.narrow(initialContext.lookup(
"plexus/Hospital"), HospitalHome.class); // this line causes the
exception
any ideas would be greatly appreciated. i think it is a configuration
issue (?)
-larry
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RE: [JBoss-user] Re: Jboss Performance problems
Hi,
one way we did it was pretty easy, you have a flag in the entity bean ,
let's say boolean bDirty = false;
In very method that writes you set this flag to true and in the ejbStore()
you set it back to false;
Is modified is implemented the following way:
public boolean isModified() {
return bDirty;
}
This should work then.
Frank
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Hermann
RANGAMANA
Sent: Friday, July 06, 2001 4:50 AM
To: [EMAIL PROTECTED]
Subject: Re: [JBoss-user] Re: Jboss Performance problems
Hi all,
could you post here some example of an entity beans implementing isModified
() ?
--hermann
- Original Message -
From: "Devraj Mukherjee" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 06, 2001 1:53 AM
Subject: Re: [JBoss-user] Re: Jboss Performance problems
> Hi Saul,
>
> I would like to know more about this, is it possible for you to email me
> one of your entity beans?
>
> Devraj
>
> At 16:00 5/07/01 -0400, you wrote:
> >Hello all,
> >
> >I implemented the isModified() method in each of the offending entity
> >beans, and the speed improvements are dramatic. A page that used to
> >take around 30-45 seconds to load now takes around .75-1.25 seconds (the
> >hardware is pretty slow). That is a HUGE performance increase.
> >
> >Thanks for your help!
> >
> >saul
> >
> >
> >___
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>
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RE: [JBoss-user] Design question - Singleton
Ok , makes sense. but when you leave the Spec a bit behind you can use it with static fields too I guess :-). Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Fred Loney Sent: Thursday, July 05, 2001 4:33 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] Design question - Singleton The EJB spec forbids an enterprise Bean to use read/write static fields. This restriction is part of the contract with the EJB Container to control the bean lifecycle, e.g. by transparently distributing bean instances across multiple JVMs. I understand GemStone was big on spawning JVMs. The standard EJB singleton technique is to bind the singleton instance to a known JNDI location and access it via JNDI lookup. A JNDI singleton is safe because it is unique in the namespace and the jndi hook prevents garbage collection. Frank Marx wrote: > I wonder if it is possible to have a static field in the session bean and > check if this field is set in the ejbCreate() -- Fred Loney Enterprise Java Consultant Spirited Software, Inc. [EMAIL PROTECTED] ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Re: Jboss Performance problems
whatever -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ferguson, Doug Sent: Thursday, July 05, 2001 2:11 PM To: '[EMAIL PROTECTED]' Subject: RE: [JBoss-user] Re: Jboss Performance problems isModified() should still work for BMP. With BMP you still define at ejbStore() method This method won't get called if isModified returns false... check the DBSynchronization class... d. -Original Message----- From: Frank Marx [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 05, 2001 3:41 PM To: [EMAIL PROTECTED] Subject: RE: [JBoss-user] Re: Jboss Performance problems I think isModified() applies only to CMP-Beans, with BMP (as far as I remember) you take care of making entities persistent in the database. Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Hunter Hillegas Sent: Thursday, July 05, 2001 1:23 PM To: JBoss 2 Subject: Re: [JBoss-user] Re: Jboss Performance problems Am I correct that isModified() only applies to BMP beans? Hunter > From: Saul Farber <[EMAIL PROTECTED]> > Reply-To: [EMAIL PROTECTED] > Date: 05 Jul 2001 16:00:25 -0400 > To: [EMAIL PROTECTED] > Subject: [JBoss-user] Re: Jboss Performance problems > > Hello all, > > I implemented the isModified() method in each of the offending entity > beans, and the speed improvements are dramatic. A page that used to > take around 30-45 seconds to load now takes around .75-1.25 seconds (the > hardware is pretty slow). That is a HUGE performance increase. > > Thanks for your help! > > saul > > > ___ > JBoss-user mailing list > [EMAIL PROTECTED] > http://lists.sourceforge.net/lists/listinfo/jboss-user > ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] JBOSS and JSP and Servlets
Hi all, I try to figure out that open source tools are fitting in the best to use JBOSS and JSP and Servlets. As far as I understand is that TomCat is the Servlet Engine and Jetty is for the JSP ? Is this right ? What would you recommend to use JBOSS with JSP and maybe some Servlets ? What about this Tool called ANT ? Thanks in advance, Frank Marx ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Re: Jboss Performance problems
Sure, but you have to write the code which checks the flag when you are using BMP as far as I know, but this is done by the Container automaticly when you use CMP. So with using tuned updates the effect is the same as when using isModified() ? How is this archieved ? Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of danch (Dan Christopherson) Sent: Thursday, July 05, 2001 1:53 PM To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] Re: Jboss Performance problems It's honored for BMP or CMP, although with CMP you can also turn on tuned updates, which has somewhat the same effect. Also, for BMP, you can simply check your mofified flag in ejbStore(). -danch Hunter Hillegas wrote: > Am I correct that isModified() only applies to BMP beans? > > Hunter > > >>From: Saul Farber <[EMAIL PROTECTED]> >>Reply-To: [EMAIL PROTECTED] >>Date: 05 Jul 2001 16:00:25 -0400 >>To: [EMAIL PROTECTED] >>Subject: [JBoss-user] Re: Jboss Performance problems >> >>Hello all, >> >>I implemented the isModified() method in each of the offending entity >>beans, and the speed improvements are dramatic. A page that used to >>take around 30-45 seconds to load now takes around .75-1.25 seconds (the >>hardware is pretty slow). That is a HUGE performance increase. >> >>Thanks for your help! >> >>saul >> >> >>___ >>JBoss-user mailing list >>[EMAIL PROTECTED] >>http://lists.sourceforge.net/lists/listinfo/jboss-user >> >> > > > ___ > JBoss-user mailing list > [EMAIL PROTECTED] > http://lists.sourceforge.net/lists/listinfo/jboss-user > ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Re: Jboss Performance problems
I think isModified() applies only to CMP-Beans, with BMP (as far as I remember) you take care of making entities persistent in the database. Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Hunter Hillegas Sent: Thursday, July 05, 2001 1:23 PM To: JBoss 2 Subject: Re: [JBoss-user] Re: Jboss Performance problems Am I correct that isModified() only applies to BMP beans? Hunter > From: Saul Farber <[EMAIL PROTECTED]> > Reply-To: [EMAIL PROTECTED] > Date: 05 Jul 2001 16:00:25 -0400 > To: [EMAIL PROTECTED] > Subject: [JBoss-user] Re: Jboss Performance problems > > Hello all, > > I implemented the isModified() method in each of the offending entity > beans, and the speed improvements are dramatic. A page that used to > take around 30-45 seconds to load now takes around .75-1.25 seconds (the > hardware is pretty slow). That is a HUGE performance increase. > > Thanks for your help! > > saul > > > ___ > JBoss-user mailing list > [EMAIL PROTECTED] > http://lists.sourceforge.net/lists/listinfo/jboss-user > ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Design question - Singleton
Hi, I wonder if it is possible to have a static field in the session bean and check if this field is set in the ejbCreate() and then react according to set status of this field. I never tried it but would this be a way to do it ? Frank -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Thursday, July 05, 2001 12:23 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: Re: [JBoss-user] Design question - Singleton It sounds like there is a problem with your design if you are trying to do this - the EJB container controls all instance creation, so you can't really create a true Singleton bean. What are you trying to do? There are many other ways to get Singleton-like functionality with EJBs. I'm assuming the bean is stateless if you want to create a Singleton, and for stateless beans the container will create as many instances as necessary to service client requests. Alex |+--> || "Hermann RANGAMANA" | || <[EMAIL PROTECTED]> | || Sent by:| || [EMAIL PROTECTED]| || eforge.net | || | || | || 07/05/01 05:07 AM | || Please respond to jboss-user| || | |+--> >--- | | | | To: <[EMAIL PROTECTED]> | | cc: | | Subject: [JBoss-user] Design question - Singleton | >--- | Hi all, I have a session bean, which number of instance should be limited to 1 (Singleton). How can i implement this with ejb? --hermann ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] Design question - Singleton
Hi, is it not possible to have a static field in the Session Bean, I mean it is not made persistent anyway. Have you tried this approach with the static field ? Frank ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
RE: [JBoss-user] JBoss performance problems
Hi, as far as I know the ejbStore() is called after you access a method of the Entity Bean (no matter if reading or writing access), because the container cannot find out if it is neccessary to update the corresponding row in the DB Table, also there is a Transaction started for the when you access a method of the entity bean. You may implement the isModified() method to support the Container. We did this and we gained a lot of performance. I hope this helps. Frank Marx ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] Problem with Caching
Hi, I post this again because from the first posting I got no response so far and I wonder if we are the only ones who encountered this problem. So here again: We have a functionality in our Application which uses a lot of instances of different entity beans in a short period of time for read access, when the cache size is default or lower then default sometimes we get a deadlock, when we make the cache size very big the deadlock didn't show up so far. Is this a evidence that there might be something wrong with the caching mechanism of JBOSS 2.2.1, are there any other people here who encountered the same problem ?? Thanks in advance, Frank Marx ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] Bug in caching mechanism ?????
Hi, we encountered a strange problem using JBOSS 2.2.1. By accessing certain Entity-Beans we encounter a LOCK_WAITING Problem which occurs more often when we decrease the CACHE-Size og JBOSS and appears less often when we increase the CACHE-Size of JBOSS. Is there something known that there might me something wrong with the JBOSS CACHING Mechanism ? Thanks in advance, Frank Marx ___ JBoss-user mailing list [EMAIL PROTECTED] http://lists.sourceforge.net/lists/listinfo/jboss-user
