Weblogic clustering - share a singleton services without implementing weblogic singletonService interface

I have a singleton object java object in my application , when i deploy my application in clustering each cluster node creates a separate singleton object thus data integrity is lost. More over I am not in a position to change any of my code with specific to web-logic and implement any third party library such as teracotta.
Can any one help me out of it in how to maintain the data integrity between the cluster nodes . Thanks in Advance

Hi,
I'm not sure if singleton services works with stateless session beans. By other hand, I understand as follow:-
1. After you have created a singleton service class using the SingletonService interface, you must define it as a singleton service within WebLogic Server, see http://download.oracle.com/docs/cd/E1284001/wls/docs103/ConsoleHelp/taskhelp/clusters/ConfigureSingletonService.html_
2. A singleton service is a service (application) on a cluster that is available and active on only one server at any given time, you must deploy the service on only one member of the cluster.
3. For high avalability, you must implement WebLogic Service Migration for your singleton service, see http://download.oracle.com/docs/cd/E1284001/wls/docs103/cluster/service_migration.html#wp1051458_
4. The clients connecting to the service, you must implement a special mechanism. See http://download.oracle.com/docs/cd/E1322201/wls/docs81/jndi/jndi.html#475689_

Similar Messages

How to implement singleton service if i m using only jar and war component

hello,
in my application i m using only jar and war component .
as i m not using EAR for deployment so i dont have weblogic-application.xml file.
so in this case how i implement weblogic singleton service .and how to call active method

From the documentation:
After you have created a singleton service class using the SingletonService interface, you must define it as a singleton service within WebLogic Server. This singleton service object contains the following information:
The path to the class to load as the singleton service.
The preferred server and other candidate servers for the singleton service.
The following excerpt from the cluster element of config.xml shows how a singleton service is defined:
<singleton-service>
<name>SingletonTestServiceName</name>
<user-preferred-server>myManaged1</user-preferred-server>
<class-name>mycompany.myprogram.subpackage.SingletonTestServiceImpl</class-name>
<cluster>myCluster</cluster>
</singleton-service>
Note that the config.xml is located in the <domain-home>/config directory

Singleton service

Hi guys
I tried to create singleton service by implement SingletonService interface which provided by weblogic.
And configure singleton service in
weblogic-application.xml file.
And define singleton service in
environment->cluster->singleton service tab in weblogic console.
I used to create Singleton service instance like such a way
SingletonServiceTest singletonServiceTest =
(SingletonServiceTest)SingletonServicesManager.
getInstance().
getService("SingletonServiceTest");
Problem was
SingletonServicesManager give the different singleton service instance for different server.

I have partial solution now:
For proper work of SingletonService, the servers (cluster nodes) must be run using node manager. Then SingletonService as pure java class works - methods activate and deactivate are called as expected.
However it seems, that MDB cannot be a SingletonService.
zmach

Error with running Singleton Service in a non-clustered mode

Hello,
I'm getting this error when try to deploy an app with defined Singleton Service in a WebLogic 10.3.5:
<Error> <Deployer> <localdomain> <AdminServer><[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default(self-tuning)'> <<WLS Kernel>> <><7785ef355ffde3d6:-4c7bfbbc:138dd48f82b:-8000-0000000000000002><1343742871514> <BEA-149231> <Unable to set the activation state to true for the application 'MyApp'.
weblogic.management.DeploymentException:
at weblogic.application.internal.flow.SingletonServicesFlow.activate(SingletonServicesFlow.java:67)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:636)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:205)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:184)
at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:361)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:52)
at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:200)
at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:31)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:170)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:124)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:181)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:97)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused By: java.lang.IllegalArgumentException: Cannot add Singleton Service MySingletonService as SingletonServicesManager not started. Check if MigrationBasis for cluster is configured.
at weblogic.cluster.singleton.SingletonServicesManager.addConfiguredService(SingletonServicesManager.java:280)
at weblogic.cluster.singleton.SingletonServicesManager.addConfiguredService(SingletonServicesManager.java:297)
at weblogic.application.internal.flow.SingletonServicesFlow.activate(SingletonServicesFlow.java:65)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:637)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:54)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:205)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:184)
at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:361)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:52)
at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:200)
at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:31)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:170)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:124)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:181)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:97)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
It gets run only after deleting singleton-service entry from weblogic-application.xml:
<singleton-service>
<class-name>my.app.SingletonClass</class-name>
<name>MySingletonService</name>
</singleton-service>
Is it possible to run it in a non-clustered server without deleting Singleton entry from weblogic-application.xml?
Thanks

Did this help you ??
Not sure if it's related as here the issue is with clustered/non clustred and versioning!! the application which the bug talks about.

Weblogic Singleton Service concurrent updates

Our environment has 1 cluster with 4 managed servers(each in a different physical servers).We have a requirement to maintain a cache which is transparent to all the 4 servers(only one copy is expected to be available at any point of time in the cluster) . This cache contains hashmap which gets updated every millisecond by clients performing calculations.This cache does not grow in volume overtime but has very frequent updates. We plan to implement a weblogic singleton service to handle this caching requirement .
1. Based on your past experience, Is weblogic singleton an ideal candidate for such a requirement. Does this introduce any delay because of synchronizing between the 4 managed servers? This will be used by the pricing engine and we do not want this to introduce any additional delay using this technology.
2. Also can you let me know what is the underlying technology weblogic(does it use IP multicast??? or do we have a choice choosing either IP socket, ip unicast or mulicast) uses to syncronize the data in singleton object with the managed servers.
3. Can I have this setup without a nodemanager as nodemanages are not allowed in our environment. According to what I read from weblogic documentation, nodemanager is required if we use consensus leasing only.If I choose to use database leasing, node manager is not required. Is that true?
Thanks for your help.

I'd be seriously looking at Oracle Coherence, which is specifically designed to solve this sort of distributing caching/map problem.
http://coherence.oracle.com/display/COH/Oracle+Coherence+Knowledge+Base+Home
-steve-

How we can limit the number of concurrent calls to a WCF service without use the Singleton pattern or without do the change in BizTalk Configuration file?

How can we send only one message to a WCF service at a time? How we can limit the number of concurrent calls to a WCF service without use the Singleton pattern or without do the change in BizTalk Configuration file? Can we do it by Host throttling?

Hi Pawan,
You need to use WCF-Custom adapter and add the ServiceThrottlingBehavior service behavior to a WCF-Custom Locations.
ServiceThrottlingBehavior.MaxConcurrentCalls - Gets or sets a value that specifies the maximum number of messages actively processing across a ServiceHost. The MaxConcurrentCalls property specifies the maximum number of messages actively
processing across a ServiceHost object. Each channel can have one pending message that does not count against the value of MaxConcurrentCalls until WCF begins to process it.
Follow MSDN-
http://msdn.microsoft.com/en-us/library/ee377035%28BTS.10%29.aspx
http://msdn.microsoft.com/en-us/library/system.servicemodel.description.servicethrottlingbehavior.maxconcurrentcalls.aspx
I hope this helps.
Rachit
If this answers your question please mark it accordingly. If this post is helpful, please vote as helpful by clicking the upward arrow mark next to my reply.

Singleton service example

Hi
          In order to create and deploy a singleton service on WebLogic 92, I did exactly as the book said (http://edocs.bea.com/wls/docs92/cluster/migration.html#wp1045262). But it didn't work.
          So I wish to find a tested example (all required files), or an artical that describes the whole process of creating and deploying a singleton-service, with one of you.
          Thx in advanse

Hi,
          I'm runing into issues trying to build a simple singleton service. Actually, I do not even know how to invoke methods on the singleton. I guess there is not enough documentation on this. Just curious whether or not you get this working. I will really appreciate it if you can share some ideas/knowledge.
          Thanks, Adam

Singleton Service in Cluster

Has anybody created the singleton servince in cluster and migrated once the server goes down. If so can you please share the sameple and steps for the migration.
Thanks,

Here is an example on how to create a singleton service: http://middlewaremagic.com/weblogic/?p=5799
Example on configuring migration can be found here: http://middlewaremagic.com/weblogic/?p=7188

Want to cluster windows service without IP address

Environment
Two nodes configured clustered on windows2008R2
Query
I want to cluster windows service without IP address. Actually I want to cluster around 7 windows services but when we configure the service to cluster, it also ask to put IP address with it. But I dont want to access these services via IP addresses. I just
want to switchover these services. How could I do that.
Any comment will be appreciated. Thanks. Zahid Haseeb.

No, Its is not possible.
Without IP address, how will you access the services?
You need a dedicated IP address for each high availability service and application you are trying to configure.
See Dave's explanation for the below post
http://social.technet.microsoft.com/Forums/windowsserver/en-US/51231c5e-c890-4c9d-a6fc-3a4500c1992c/ip-address-allocation-in-failover-clusters-services-and-applications?forum=winserverClustering
Regards,
Rafic
If you found this post helpful, please give it a "Helpful" vote.
If it answered your question, remember to mark it as an "Answer".
This posting is provided "AS IS" with no warranties and confers no rights! Always test ANY suggestion in a test environment before implementing!

Use Enterprise Services without service registry?

Hello experts,
this question is following me since days: is it possible to use enterprise services from an erp-system without a service registry?
From my understanding the service registry at runtime determines the endpoint where the service is implemented. But when there is just a single erp-system is it then possible to use this services without any additional systems?
Thanks for any answer.
Regards,
Norbert

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anton

Is there a way to update an external dictionary for services without migrating the services

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dont think so but I could be wrong
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Hi,
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Use-Case for Business Services (Service Without Party) in SAP XI

Hi,
I have a synchronous scenario where I am calling a web Service from SAP R/3 via SAP XI. I have designed the Integration Scenario in the Integration Repository, where I created an A2A role for the R/3 System and a B2B Role for the Web Service. For the Web Service Party in the Integration Directory I use a Business Service unterneath 'Service without Party' as the party for the Web Service is unknown.
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Hi,
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For file systems which are generally just servers come under Business service. This is one of the place where you use Business service.
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Vijaya
Message was edited by: vijaya kumari

Business Service Without Party in Integration Scenrio Configurator

Hi everybody
I am stucking in a small issue but do not found a related thread.
Can anybody explain me, why I cannot assign a "Business Service" of typ "Service without Party" to an Application Component? I am try to configure my integration Process and call in the directory Tools --> Transfer Integration Scenario from Integration Repository. In the following Configurator I can only assign Business Systems from SLD or Services with a Party depending on the settings of the Application Component in the Repository (Flag "External Party with B2B Communication"). If you configure the scenario manually it is possible to involve Business Services without party. But I would like to make use of the Wizard and my Customer has a lot of Systems maintained as Business services.
Any suggestions?
Regards Oliver

Hi,
I have not done this type of task before.. but from the given links
see the below information was in the above first link
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Use the input help () to select the business services.
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Weblogic clustering - share a singleton services without implementing weblogic singletonService interface

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