Lookup on multiple ejb instances accross servers using servicelocator

Hi all,
i have a weird problem. I have to hit multiple ejbs hosted in diffrent server.
The problem is with the lookup and accessing..
some server's components have username and passwords and other server donot have.
So though i create a new Initial context instance with diffrent parameters.. it
is getting messed up inside. ie it is passing server A username and password to
server B's method call as for B i donot set username and password there is no
need of username and password.
the service locator will server for only one server's objects lookup. but here
we have multiple components in diffrent so different provider_URL INITIAL_CONTEXT_FACTORY,
SECURITY_PRINCIPAL, SECURITY_CREDENTIALS
and the for each i have a seperate sericelocator.. like each one for componet
A, B, C etc. in diffrent servers
and they inturn have InitialContext instance of their own. .. and these are initilized
with the factory, url, username and credentials...
this can be set as the system property also using -D option. thatz why .. when
i create for one component.... the already created Initial context factory is
getting affected with the new values. ;(((
one solution is every time create the Initial context... do not hold the reference
of contexts and donot hold reference of home handles..
but i need to cache atleast the home handles, if i am not caching.. the performance
is really bad.
on the cached handle if i call method i get a java.rmi.AccessException: Security
violation: insufficient permission to access method, though it worked for first
time,
and on the servers it which does not need passwords, method call is throwing java.lang.SecurityException:
Authentication for user ServerAUser denied in realm wl_realm
but the serverAUser belongs to server A, i get this error when i call a componets
method on Server B.
Is this a bug, or the Initial Context working it self is this way, the behind
the scence provider class is messing up. bea guys please reply if u know to solve
this problem, it will be of real help.
reagrds,
Arun.N

Problem resolved as this is an stateless session bean issues.

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jobComplete = true;
The application is working for multiple server instances with a single cluster node but not working for multiple cusltered environment.
Anybody knows what should be changed to handle more cluster nodes?
Thanks,
Gergely

Thanks for the response.
I was afraid that it would be something like that although
was hoping for
something closer to the application pools we use with IIS to
isolate sites
and limit the impact one badly behaving one can have on
another.
mmr
"Ian Skinner" <[email protected]> wrote in message
news:fe5u5v$pue$[email protected]..
> Run CF with one instance. Look at your processes and see
how much memory
> the "JRun" process is using, multiply this by number of
other CF
> instances.
>
> You are most likely going to end up on implementing a
"handful" of
> instances versus "dozens" of instance on all but the
beefiest of servers.
>
> This can be affected by how much memory each instance
uses. An
> application that puts major amounts of data into
persistent scopes such as
> application and|or session will have a larger foot print
then a leaner
> application that does not put much data into memory
and|or leave it there
> for a very long time.
>
> I know the first time we made use of CF in it's
multi-home flavor, we went
> a bit overboard and created way too many. After nearly
bringing a
> moderate server to its knees, we consolidated until we
had three or four
> or so IIRC. A couple dedicated to to each of our largest
and most
> critical applications and a couple general instances
that ran many smaller
> applications each.
>
>
>
>
>

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a

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Mike Kendzierski <[email protected]> wrote in message
news:[email protected]..
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"Ed" <[email protected]> wrote in message
news:3a296c2d$[email protected]..
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"Mark Hartnett" <[email protected]> wrote in message
news:3f57a4a3$[email protected]..
>
I am having a problem debugging using Eclipse 2.1 and the weblogic serverplugin
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group too in hope it will help.
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configurations, they could not use a single Weblogic server instance, so we
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quite different from both multihoming and clustering because all the server
instances are independent from one another (unlike clustering) but run on
the same IP (unlike multihoming) and different port numbers.
This is the simplest procedure for a Solaris computer:
1: Install WebLogic.
Let's say the WL installation folder is:
/wls/weblogic/
we'll call that:
WL_HOME/WLS_HOME/
It contains the default server instance folder
/wls/weblogic/myserver/
we'll call that:
WL_HOME/WLS_HOME/myserver/
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of the default server instance folder
with different names, you'll have:
WL_HOME/WLS_HOME/myserver/
WL_HOME/WLS_HOME/server_1/
WL_HOME/WLS_HOME/server_2/
WL_HOME/WLS_HOME/server_n/
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(we'll call it: WL_HOME/WLS_HOME/weblogic.properties)
and make a copy of it into EACH of the individual
server instance folders; you'll end up with:
WL_HOME/WLS_HOME/weblogic.properties
WL_HOME/WLS_HOME/myserver/weblogic.properties
WL_HOME/WLS_HOME/server_1/weblogic.properties
WL_HOME/WLS_HOME/server_2/weblogic.properties
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set per-server values to all the properties
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weblogic.password.system=PWD_i
weblogic.system.SSLListenPort=SSLPORT_i
plus everything else it should need individually,
that is, all the things that make that single
server instance different from all the others
(connection pools, ACLs, EJB auto deployments and so on)
Do NOT modify the file
WL_HOME/WLS_HOME/myserver/weblogic.properties
(it's a backup copy of the default settings)
5: In the GLOBAL properties file
WL_HOME/WLS_HOME/weblogic.properties
cancel or comment out all the properties
that have been individually set for all
the individual server instances; at least:
weblogic.system.listenPort
weblogic.password.system
weblogic.system.SSLListenPort
6: Locate the default server's startup script
/wls/weblogic/startWebLogic.sh
(we'll call it: WL_HOME/WLS_HOME/startWebLogic.sh)
and make a copy of it (in the same folder)
for EACH of the new individual server instances;
you'll end up with:
WL_HOME/WLS_HOME/startWebLogic.sh
WL_HOME/WLS_HOME/startServer_1.sh
WL_HOME/WLS_HOME/startServer_2.sh
WL_HOME/WLS_HOME/startServer_n.sh
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WL_HOME/WLS_HOME/startServer_i.sh
set values to the properties:
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(where WL libraries and global files are)
weblogic.system.home=WL_HOME/WLS_HOME
(where the GLOBAL weblogic.properties is)
weblogic.system.name=server_i
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weblogic.system.listenPort=PORT_i
weblogic.system.SSLListenPort=SSLPORT_i
with the -D option, as in:
$JAVA $JAVA_OPTIONS -ms64m -mx64m -classpath
$JAVACLASSPATH -Dweblogic.class.path=$WEBLOGICCLASSPATH -Dweblogic.home=$WL_
HOME/$WLS_HOME -Dweblogic.system.home=$WL_HOME/$WLS_HOME -Dweblogic.system.n
ame=server_i -Djava.security.manager -Djava.security.policy=`pwd`/weblogic.
policy -Dweblogic.system.listenPort=PORT_i -Dweblogic.system.SSLListenPort=
SSLPORT_i weblogic.Server
8: If you like, you might also write a shutdown script
for each server instance (often faster than the console)
WL_HOME/WLS_HOME/stopServer_i.sh
which might look like:
java -classpath $JAVACLASSPATH weblogic.Admin t3://$HOSTNAME:PORT_i SHUTDOWN
system $PWD_i
9: If you need individual per-server security policies,
also duplicate and customize the default policy file
WL_HOME/WLS_HOME/weblogic.policy
(just like you did with weblogic.properties in steps 3 to 5)
and specify the corresponding property in each startup script
with the -D option
-Djava.security.policy=`pwd`/server_i/weblogic.policy
10: Obviously, when you deploy and use your EJBs or JSPs or applications,
you must make sure that you specify the right individual server's parameters
(name, user, password, port, paths and everything else).
And that's all; obviously, there are better ways to achieve the
"parallel-servers" configuration, but this is the simplest one and is good
enough for a basic development environment; you might need to tune some more
properties to suit your specific requirements.
On a WinNT computer, the procedure should be more or less the same, the main
difference being: instead of .sh script files, you'll have to edit .cmd
script files.
I am very grateful to all the people on the newsgroups who helped me work
that out. Good luck!
Paola R.

"Paola R." wrote:
          > If understand that right, the way to do it is:
          >
          > - make two "clones" of the default /weblogic/myserver/ folder , say
          > /weblogic/server_1/ and /weblogic/server_2/;
          > - make a copy of file /weblogic/myserver/weblogic.properties into each new
          > folder;
          > - in the original /weblogic/myserver/weblogic.properties file, comment out
          > server-variant properties (ordinary and secure port numbers, at least) ;
          > - in each /weblogic/server_x /weblogic.properties file, set per-server
          > values to server-variant properties (ordinary and secure port numbers, at
          > least) and comment out (or leave unchanged) everything else;
          > - start each server from /weblogic/myserver/ , by specifying the path to
          > respective per-server properties in command line (or script) with
          > option -Dweblogic.home=./server_n .
          You also need weblogic.system.name=server_n and I believe it's
          weblogic.system.home rather than weblogic.home. The latter should point
          to
          your /weblogic directory.
          Hope this helps.
          Alexander Petrushko
          mailto:[email protected]
          Consulting Services available

Weblogic 10.3 POJO to EJB 3.0 call using JNDI

Hi all,
We are upgrading our applications from OAS to WL 10.3 and I am running into EJB lookup issues. Here is what I currently have in terms of setup.
One EAR file being deployed and there are two main jar files in it that communicate with each other. The first jar file contains POJOs and the second is an EJB jar file. One of the classes in the POJO jar file is doing a lookup for an EJB that can be found in the EJB jar file.
EAR file
---> POJO jar
---> EJB jar file
The EJB itself is declared as follows
@Stateless
public class MyBean implements MyBeanService
I added ejb-jar.xml and weblogic-ejb-jar.xml DDs to my ejb jar file and the bean reference shows up in the Weblogic console under the application after the deployment.
ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd" version="3.0">
<enterprise-beans>
          <session>
               <ejb-name>MyBean</ejb-name>
               <business-local>package.MyBeanService</business-local>
               <ejb-class>package.MyBean</ejb-class>
               <session-type>Stateless</session-type>
          </session>
     </enterprise-beans>
</ejb-jar>
weblogic-ejb-jar.xml
<weblogic-ejb-jar xmlns="http://www.bea.com/ns/weblogic/90"
xmlns:j2ee="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.bea.com/ns/weblogic/90
http://www.bea.com/ns/weblogic/90/weblogic-ejb-jar.xsd">
     <weblogic-enterprise-bean>
          <ejb-name>MyBean</ejb-name>
          <jndi-name>ejb/MyBeanService</jndi-name>
     </weblogic-enterprise-bean>
</weblogic-ejb-jar>
My POJO call to JNDI is
InitialContext initialContext = new InitialContext();
Object found = initialContext.lookup("ejb/MyBeanService"); //---------------------FAILS ON THE LOOKUP ON THIS LINE
System.out.println(found.getClass());
Error
javax.naming.NameNotFoundException: Unable to resolve 'ejb.MyBeanService'. Resolved 'ejb'; remaining name 'MyBeanService'
Am I not using the right lookup name? Must I prefix the call with the name of my ejb jar name?
Thanks
S.

Hi,
I made the changes as requested and it looks as follows.
<weblogic-ejb-jar xmlns="http://www.bea.com/ns/weblogic/90"
xmlns:j2ee="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.bea.com/ns/weblogic/90
http://www.bea.com/ns/weblogic/90/weblogic-ejb-jar.xsd">
     <weblogic-enterprise-bean>
          <ejb-name>MyBean</ejb-name>
          <stateless-session-descriptor>
                    <business-local>package.MyBeanService</business-local>
                    <jndi-name>ejb/MyBeanService</jndi-name>
               </business-interface-jndi-name-map>
          </stateless-session-descriptor>
     </weblogic-enterprise-bean>
</weblogic-ejb-jar>
I don't think <business-remote> works in <business-interface-jndi-name-map>.
VALIDATION PROBLEMS WERE FOUND problem: cvc-complex-type.2.4a: Expected element 'business-remote@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar' instead of 'business-local@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar' here in element business-interface-jndi-name-map@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar:<null> problem: cvc-complex-type.2.4a: Expected element 'business-remote@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar' instead of 'jndi-name@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar' here in element business-interface-jndi-name-map@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar:<null> problem: cvc-complex-type.2.4c: Expected element 'business-remote@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar' before the end of the content in element business-interface-jndi-name-map@http://xmlns.oracle.com/weblogic/weblogic-ejb-jar:<null>
Anyhow if I use the <business-remote> I still get the following error when I call
Object found = initialContext.lookup("ejb/MyBeanService"); ----> ERROR
javax.naming.NameNotFoundException: Unable to resolve 'ejb.MyBeanService'. Resolved 'ejb'; remaining name 'MyBeanService'
Thanking you in advance.
S.

Pros and Cons of Application Isolation/Multiple server instances?

Hi. I'm setting a new server using ColdFusion Enterprise with Apache to migrate several web application from and old server with ColdFusion 7 server. I'm currently doing research regarding multiple server instances in order to have a separate server for production apps and another for development apps (see http://help.adobe.com/en_US/ColdFusion/10.0/Admin/WSc3ff6d0ea77859461172e0811cbf363c31-7ff 5.html and https://wikidocs.adobe.com/wiki/display/coldfusionen/Using+Multiple+Server+Instanceshttp:/ /). In addition, I'm also doing research regarding application isolation to have separate production application in separate servers. I'm trying to identify all pros and cons for both "Application Isolation" and "Multiple Server Instances" to make a decision on whether I will proceed in applying these techniques. I have found several links that talk about some of the advantages but have not been able to find anything regarding possible disadvantages. Have anyone in this forum has used any of the techniques, and can provide more information/experiences regarding the pros and cons?

Hi Ricardo_Lorenzo,
Whether to go for Multiserver instances or Single server, is totally a user requirement based decison. If a user has Single website, or multiple websites (of the same nature, in terms of functionality), usually the part of same domain, then they would go for Single sever installation. One single instance will handle the requests from all the websites (if there are multiple). There would not be a clustering/failover setup within ColdFusion and can use the ColdFusion Standard or Enterprise version.
On the other hand, if a user has multiple websites, all with different functionality and have multiple applications (may or may not) running, then they can go for Multiserver installation. Each website can be configured with individual instances. Clustering can be done within ColdFusion if needed. One would need an Enterprise license of ColdFusion for the same.
Hope this helps.
Regards,
Anit Kumar

Lookup on multiple ejb instances accross servers using servicelocator

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