JNDI and clustering

All,
          What happens with naming services in a clustered environment?
          Is the naming service dupilcated across all servers in the cluster or
          are they other approaches?
          How is this configured?
          What is the effect on the client when requesting the initial context ina
          clusteerd environment?
          Thanks in advance
          Aaron

Aaron Robinson wrote:
          > All,
          >
          > What happens with naming services in a clustered environment?
          > Is the naming service dupilcated across all servers in the cluster or
          > are they other approaches?
          >
          Anything you bind into the jndi tree will be replicated.
          > How is this configured?
          Nothing to configure. It is automatic when you start servers in a
          cluster.
          > What is the effect on the client when requesting the initial context ina
          > clusteerd environment?
          None.
          >
          > Thanks in advance
          > Aaron
          Cheers
          - Prasad

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Session Failover and Clustering

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          Thank you very much for your responses. It has been very helpful and I am clear on the session/clustering stuff. I have new questions on EJB and clustering which I will post as a separate thread.
          Giri
          "Jason Rosenberg" <[email protected]> wrote:
          >And also, if the browser has cookies disabled, it is important for
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          >
          >So, in all http responses, be sure to pass the url string through
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          >on whether cookies are enabled or not.
          >
          >I've just only recently figured this out. Haven't actually tried it
          >all out yet, so forgive me if it is not quite this simple, but this
          >seems to be the gist of it...
          >
          >Jason
          >
          >
          >"Justin James" <[email protected]> wrote in message news:[email protected]...
          >>
          >> Giri,
          >>
          >> I'm not a weblogic representative, but I tried to replicate this proxing service inside a load balancing switch(BigIP) and I
          >discovered a few things. The weblogic server sets a cookie (WebLogicSession)that the webserver plugin uses to manage the proxying.
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          >If the primary server does not respond, the request is forwarded to the secondary server by the plugin. Regardless of cluster size,
          >the session is replicated to only one other server.
          >>
          >> <[email protected]> wrote:
          >> >Giri Alwar wrote:
          >> >
          >> >> I need a couple of clarifications. First with regard to Question 1, I understand that plugins provide load balancing and
          >failover but what I really was asking is how the plugin in WS2 knows that a session for the client has been initiated in AS1 as a
          >result of WS1 sending the initial request to AS1. If WS2 gets a future request from the client, it needs to know this to send the
          >request to AS1. Does the plugin talk to the cluster to find out if there is a primary and who it is?
          >> >>
          >> >
          >> >> I should have clarified that my other questions pertain to in-memory replication. If I do not persist the session in a database
          >then does the client get an error message (timeout) when AS1 goes down (assuming we use NES with the WebLogic plugin)?
          >> >
          >> >Plugins' know how to route requests based on cookies. If it can't reach the primary server it will automatically try secondary.
          >In your case it doesn't matter if it reaches to proxy 1 or proxy 2, it is still the same.
          >> >
          >> >- Prasad
          >> >
          >> >> To prevent this error message and achieve failover, do I need to use WebLogic as the proxy server? If so, why isn't the NES
          >plugin doing this?
          >> >
          >> >> Thanks.
          >> >> Giri
          >> >>
          >> >> Prasad Peddada <[email protected]> wrote:
          >> >> >Giri Alwar wrote:
          >> >> >
          >> >> >> Let's say that we have two WebServers (NES) with the weblogic plugin (say WS1 and WS2) and a cluster with two
          >WebLogicCommerce AppServers (say AS1 and AS2). Let's assume that each WebServer and AppServer runs on its own machine (total: 4
          >machines). Now, let's assume that the WebServer "obj.conf" files (on both WS1 and WS2) are setup so that they point to the servers
          >in the cluster (WebLogicCluster="AS1:7601,AS2:7601").
          >> >> >>
          >> >> >> When a new request comes in to one of the WebServers (say WS1), the plugin will route it to one of the AppServers using
          >Round-Robin (say AS1). A session will now be initiated in AS1 and it sends a response back to the client.
          >> >> >>
          >> >> >> Question 1: How does the other proxy in WS2 know that all future requests for this client need to be forwarded to AS1?
          >> >> >
          >> >> > Plugin takes care of load balancing and failover, it is all transparent to the client.
          >> >> >
          >> >> >
          >> >> >> Question 2: For failover, does the cluster automatically replicate the session state existing in AS1 onto AS2 before sending
          >the response (does AS2 automatically become the secondary)?
          >> >> >
          >> >> > If you have only two yes it is automatically your secondary. Yes, replication is synchronous.
          >> >> >
          >> >> >>
          >> >> >> Now let's assume that AS1 crashes/dies. When the next request from the client comes to WS1 or WS2, they will forward it to
          >AS1 (assuming that WS2 knows about the client session in AS1) . Since AS1 has crashed, will the client eventually get a timeout
          >error message?
          >> >> >
          >> >> > If you are using some kind of persistence then you will be able to retrieve the session information and since the server
          >is not available the request will automatically failover.
          >> >> >
          >> >> >> Question 3: To ensure that the session failover happens so that AS2 gets the request instead (becomes the primary), do we
          >need to setup a WebLogic Proxy Server? If so, why can't the plugins for NES provide the failover themselves?
          >> >> >
          >> >> > No, you need only one. Either NES or weblogic proxy.
          >> >> >
          >> >> >
          >> >> >> Thank you very much for your help!
          >> >> >> Giri
          >> >> >
          >> >> >- Prasad
          >> >> >
          >> >
          >>
          >
          >

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Hello everyone,
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ref13E,
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I'm aware that replication isn't supported for stateful EJBs. But the
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Guys,
Thanks for the information.
The problem was that classpath, some other packages required for the Bean
were not in the weblogic\classes directory.
so that was it.
Thanks
/selvan
Murali Krishna Devarakonda wrote in message
<7qjkr1$7dl$[email protected]>...
Are you using the HOT DEPLOY feature(startweblogic.bat does it)?
Then you could go to the WebLogic Console, select the Bean, and Redploy.
You could also do it from a command line utility "weblogic.deploy".
If you didn't start the server with the hot deploy, you need to restartyour
server after any changes.
You should read the weblogic docs on the Hot Deploy feature. A different
classloader is used for it. Also, the standard weblogic classpath cannot
coexist with it.
Hot Deploy uses: (assuming your weblogic installation is in D:/WebLogic
D:\WebLogic\classes/boot
It will throw an exception if you have D:\weblogic\classes or
D:\WebLogic\lib\weblogicaux.jar in the system classpath. You need to use
the weblogic.classpath instead.
Regards,
Murali Krishna Devarakonda
Tamilselvan Ramasamy <[email protected]> wrote in message
news:7qi0ln$kpc$[email protected]..
Hello,
I have created bunch of EJB Components and deployed for WLS4.0 using the
following way. It works fine under WLS4.0
To compile java code -> javac *.java
Create SER file -> java weblogic.ejb.utils.DDCreator -d .
DeploymentDescriptor.txt
Create JAR file -> jar cmf manifest Bean.jar /directory
EJBC and deployment -> java weblogic.ejbc -d /targetDirectory Bean.jar
and also add an entry in the welogic.properties file
weblogic.ejb.deploy= ...
When I do the samething in the WLS4.5, it doesn't work, first of all,
JNDI
is not finding the home interface. It throws a naming Exception
please give me an idea hw do I deploy my Beans in the WLS4.5 using the
command line option. I don't have Visual Cafe to do that automatically.So
I
have to do that manually.
Thanks
/selvan
Captura Software Inc
[email protected]

JNDI and env. vars. in ejb-jar.xml

I have been trying for several days now to have my EJB session bean access
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The only place I have been able to store my env. vars. is in the web.xml
document outside my .jar file. Although workable, it would be preferable to
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Context init = new InitialContext();
Context env = (Context)init.lookup("java:comp/env");
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<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise
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<home>USDataworks.MICRworks.MICRworksHome</home>
<remote>USDataworks.MICRworks.MICRworks</remote>
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<description>Flag indicating whether to convert corporate
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<env-entry-type>java.lang.Boolean</env-entry-type>
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<env-entry-type>java.lang.String</env-entry-type>
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<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>routing_file.txt</env-entry-value>
</env-entry>
</session>
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<container-transaction>
<method>
<ejb-name>MICRworksBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Supports</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
and my weblogic-ejb-jar.xml:
<!DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic 7.0.0
EJB//EN' 'http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>MICRworksBean</ejb-name>
<stateless-session-descriptor>
<pool>
</pool>
<stateless-clustering>
</stateless-clustering>
</stateless-session-descriptor>
<transaction-descriptor>
</transaction-descriptor>
<jndi-name>MICRworksBean</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
My feeling is that I am missing some sort of reference in the
weblogic-ejb-jar.xml that points to the ejb-jar.xml but I have tried several
things without success.
I would appreciate any help I can get...especially if it contains specific
code I can use as I am rather new to writing and deploying ejbs!
Thanx in advance. Marek :-)

Thanks for the reference. I was using another book as a reference (Using
Java 2 Enterprise Edition by Mark Wutka) which had the same sort of example
and as you can see below, I coded my bean as they suggest...I'm still unable
to access the env. vars.!
I deployed by bean using WebLogic's Builder and but didn't create any sort
of application. I let WebLogic do what it would on its own. The WebLogic
documentation seemed to indicate for simple testing this would work
fine...is it wrong?
btw. MICRworks.MICR_ENV_TRUNCORP equates to "TruncateCorporate" as you
probably guessed.
The WebLogic Admin Console shows the environment variables in the EJB
Descriptors for my EJB but they do not show up when I view the JNDI tree for
my server. I have taken this to mean that the deployment tool is not
binding my env. vars. for some reason which would explain why my bean can't
find them.
I know it must be something stupid I am doing (or not doing) but I just
can't see it. Please help!
"Ryan LeCompte" <[email protected]> wrote in message
news:[email protected]...
>
Hello Marek,
I would suggest that you download the free book "Mastering EJB 2ndEdition" by
Ed Roman, Scott Ambler, and Tyler Jewell. The source code for the book isalso
freely available and is meant to be deployed specifically on WebLogic.Look for
a sample application called "Jasmine", which shows how to use environmententries.
You will see a concrete example of how they are defined and later accessedfrom
within EJBs. The book and source code are available at the followingaddress:
>
http://www.theserverside.com/books/masteringEJB/index.jsp
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Marek Kossak" <[email protected]> wrote:
I have been trying for several days now to have my EJB session bean
access
its env. vars. stored in the ejb-jar.xml document. I have beenunsuccessful.
The only place I have been able to store my env. vars. is in the web.xml
document outside my .jar file. Although workable, it would be preferable
to
store them in the ejb-jar.xml document in my .jar file.
I am hoping some one can help me. I am using the following code in my
ejb:
Context init = new InitialContext();
Context env = (Context)init.lookup("java:comp/env");
m_bTruncCorporate =
((Boolean)env.lookup(MICRworks.MICR_ENV_TRUNCORP)).booleanValue();
m_strOptPath = (String)env.lookup(MICRworks.MICR_ENV_OPFLPATH);
m_strOptAccount = (String)env.lookup(MICRworks.MICR_ENV_OPFLACCT);
m_strOptRouting = (String)env.lookup(MICRworks.MICR_ENV_OPFLROUT);
My ejb-jar.xml follows:
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise
JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>MICRworksBean</ejb-name>
<home>USDataworks.MICRworks.MICRworksHome</home>
<remote>USDataworks.MICRworks.MICRworks</remote>
<ejb-class>USDataworks.MICRworks.MICRworksBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
<env-entry>
<description>Flag indicating whether to convert corporate
checks</description>
<env-entry-name>TruncateCorporate</env-entry-name>
<env-entry-type>java.lang.Boolean</env-entry-type>
<env-entry-value>true</env-entry-value>
</env-entry>
<env-entry>
<description>Location of the 1For1 exclusion files</description>
<env-entry-name>OptionFilePath</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>http://localhost:7001/MICRworksLite/files/</env-entry-valu
e
>>>
</env-entry>
<env-entry>
<description>Name of the 1For1 account exclusions file</description>
<env-entry-name>OptionFileAccount</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>account_file.txt</env-entry-value>
</env-entry>
<env-entry>
<description>Name of the 1For1 routing exclusion file</description>
<env-entry-name>OptionFileRouting</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>routing_file.txt</env-entry-value>
</env-entry>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>MICRworksBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Supports</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
and my weblogic-ejb-jar.xml:
<!DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic
7.0.0
EJB//EN' 'http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>MICRworksBean</ejb-name>
<stateless-session-descriptor>
<pool>
</pool>
<stateless-clustering>
</stateless-clustering>
</stateless-session-descriptor>
<transaction-descriptor>
</transaction-descriptor>
<jndi-name>MICRworksBean</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
My feeling is that I am missing some sort of reference in the
weblogic-ejb-jar.xml that points to the ejb-jar.xml but I have tried
several
things without success.
I would appreciate any help I can get...especially if it containsspecific
code I can use as I am rather new to writing and deploying ejbs!
Thanx in advance. Marek :-)

JNDI when clustering

Hi Don ,
          All the manager servers in a cluster send heartbeat messages to each other
          using multicast adress) after a certain time period ( i.e every 10 sec ) ,
          at that time it updates their local JNDI tree .
          When we do clustering and a new object object get bound to a cluster then
          that object's JNDI will be replicated to all the server's in the cluster .
          Thanks and regards
          Johnny
          "Don Ferguson" <[email protected]> wrote in message
          news:[email protected]...
          > We are using ip-multicast to propogate the JNDI information to other
          > servers in the cluster. I believe the update is sent immediately
          > (rather than batched and refreshed periodically) but I'm not sure what
          > the propogation delay.
          >
          > matt wrote:
          > >
          > > Selvan,
          > > My understanding is that by default all objects registered to JNDI will
          be
          > > clustered unless you specify a "do not cluster" property in the
          > > properties file. The exact property can be found in the API doc for
          JNDI.
          > > Sunil
          > >
          > > Selvan Ramasamy <[email protected]> wrote in message
          > > news:[email protected]...
          > > > Hello,
          > > >
          > > > If I do cluster few servers then what about the objects I bind them in
          the
          > > > JNDI.
          > > > how frequently these JNDI get reflected to all the cluster servers.
          > > > I am going to do some caching for my clients by binding some java
          > > classes
          > > > in the JNDI.
          > > >
          > > > I think that I am not clear about JNDI bindings with cluster.
          > > >
          > > > Please help me out what exactly happens when do clustering and a new
          > > object
          > > > get bound in the JNDI.
          > > >
          > > > Thanks
          > > > /selvan
          > > >
          > > > Selvan Ramasamy
          > > > Captura Software Inc
          > > >
          > > >
          > > >

T3 protocol and clusters

Hi,
          I'm porting a Java application running against WLS6.0 to use a clustered
          server solution. This means I connect via t3 protocol. Any views on the best
          way to get failover and loadbalancing from this approach, for example is
          there anyway I can get the weblogic proxy functionality of
          HttpClusterServlet without using http protocol?
          Thanks
          Sioux


Your web.xml looks OK to me.
          All you need to do is, create a .war file and copy it into applications
          directory of proxy server.
          Then register this webapp as default webapp. So whenever you hit proxy server ,
          those requests
          will be handled by this default webapp, in turn the requests will be routed to
          one of the clustered servers.
          Hope it helps
          Kumar
          Sioux France wrote:
          > Hi,
          > I understand this solution, can I ask about the possibility of using a
          > proxy?
          > Is it possible if my URL is t3://localhost:7001 and I now want to use a
          > proxy on this server to redirect to the cluster to use HttpClusterServlet
          > rather than a DNS based solution? If so what do I call to get the proxy to
          > redirect me to the cluster?
          > I've set up a servlet for HttpClusterServlet with my cluster members in the
          > parameters. How can I test from a browser that this is proxying correctly?
          > For the t3 protocol is it possible to get redirection to the cluster members
          > using HttpClusterServlet from a command line client, or is this route only
          > available for web-based queries as that is the only way the
          > HttpClusterServlet can intercept the call? i.e. Must I use my own failover
          > implementation in a DNS-based solution as discussed below?
          >
          > Here's the web.xml for my HttpClusterServlet which I've set as my default
          > webserver on the admin server. Any help understanding this appreciated!
          > Sioux
          >
          > <web-app>
          > <servlet>
          > <servlet-name>HttpClusterServlet</servlet-name>
          > <servlet-class>
          > weblogic.servlet.internal.HttpClusterServlet
          > </servlet-class>
          >
          > <init-param>
          > <param-name>defaultServers</param-name>
          > <param-value>
          > managedserver1:7003:7004|managedserver2:7003:7004
          > </param-value>
          > </init-param>
          >
          > <init-param>
          > <param-name>DebugConfigInfo</param-name>
          > <param-value>ON</param-value>
          > </init-param>
          >
          > </servlet>
          > <servlet-mapping>
          > <servlet-name>HttpClusterServlet</servlet-name>
          > <url-pattern>/</url-pattern>
          > </servlet-mapping>
          >
          > 
          > <servlet-mapping>
          > <servlet-name>HttpClusterServlet</servlet-name>
          > <url-pattern>*.html</url-pattern>
          > </servlet-mapping>
          >
          > </web-app>
          >
          > "Robert Patrick" <[email protected]> wrote in message
          > news:[email protected]...
          > > The connection to the cluster is done via the JNDI lookup. The
          > PROVIDER_URL
          > > should be the "cluster name" which is either a DNS name that is mapped to
          > the
          > > list of IP addresses of the clustered servers or a hardware load-balancer.
          > Once
          > > that connection has been made, you will be looking up EJB Home objects --
          > the
          > > objects downloaded to your client are "smart stubs" that understand
          > clustering.
          > > Multiple invocations on that EJBHome reference will be load-balanced
          > across the
          > > cluster of available servers (meaning that it will handle fail-over).
          > This is
          > > easy to do since the EJBHome object is always stateless. If you use
          > stateless
          > > session beans, you can get the same behavior at the bean instance level.
          > > Stateful session beans can be replicated in-memory across a pair of server
          > > instances (much like the HttpSession replication).
          > >
          > > I suggest that you read our clustering documentation at
          > > http://e-docs.bea.com/wls/docs60/
          > >
          > > Hope this helps,
          > > Robert
          > >
          > > Sioux France wrote:
          > >
          > > > I think my point is missed, I have a lovely running cluster, with
          > clustered
          > > > EJBs, clustered JMS and now I want to call it via the t3 protocol or
          > > > something similar from a Java Application. As I understand this, it
          > means I
          > > > can't use HTTP or a proxy. I order to utilise the failover/loadbalancing
          > of
          > > > the cluster that exists, how should I connect to it from the client, can
          > I
          > > > use DNS, RMI, is there any documentation for running a cluster with Java
          > > > Application clients rather than a web front end?
          > > >
          > > > "Robert Patrick" <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > Use clustered EJBs.
          > > > >
          > > > > Sioux France wrote:
          > > > >
          > > > > > Hi,
          > > > > > I'm porting a Java application running against WLS6.0 to use a
          > clustered
          > > > > > server solution. This means I connect via t3 protocol. Any views on
          > the
          > > > best
          > > > > > way to get failover and loadbalancing from this approach, for
          > example is
          > > > > > there anyway I can get the weblogic proxy functionality of
          > > > > > HttpClusterServlet without using http protocol?
          > > > > > Thanks
          > > > > > Sioux
          > > > >
          > >

JNDI and clustering

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