独立服务器上的Weblogic SingletonService

Question

是否可以在非集群环境中运行weblogic的SingletoneService？我试过这个：

<30.10.2012 18:25:57> <Error> <Deployer> <BEA-149202> <Encountered an exception while attempting to commit the 1 task for the application 'myApplication'.> 
<30.10.2012 18:25:57> <Warning> <Deployer> <BEA-149004> <Failures were detected while initiating deploy task for application 'myApplication'.> 
<30.10.2012 18:25:57> <Warning> <Deployer> <BEA-149078> <Stack trace for message 149004
weblogic.management.DeploymentException: 
    at weblogic.application.internal.flow.SingletonServicesFlow.activate(SingletonServicesFlow.java:67)
    at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:635)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
    at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
    at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:16)
    Truncated. see log file for complete stacktrace
java.lang.IllegalArgumentException: Cannot add Singleton Service DemoSingleton 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:635)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
    Truncated. see log file for complete stacktrace
> 

当然我没有为集群配置MigrationBasis，因为我没有集群。但我认为可以在集群和独立服务器上运行它。我错了，或者SingletoneService可能存在其他一些可能导致此错误的错误

Answer 1

Singleton Service只能在WebLogic群集的上下文中使用。对于独立服务器@Singleton，EJB注释就足够了。

实现SingletonService的应用程序仅适用于群集中的受管服务器。此应用程序无法部署到独立的受管服务器（即不属于任何群集的受管服务器）。

Answer 2

一个简单的解决方案是通过配置迁移策略来修复“检查是否已配置集群的MigrationBasis”消息。之后，单例也可以部署在单个节点（单节点集群）上。在环境 - ＆gt;下群集您将找到以下设置：