0 Replies Latest reply on Jul 30, 2003 9:34 AM by Mike Osganian

    Persisting your MBean

    Mike Osganian Newbie

      What is the perferred way of persisting your MBean? I'm trying to find the best pattern. Should you just implement PersistentMBean then each MBean has to handle loading and saving? I really would like to persist the information to a database. Seems kinda weak to have every MBean to have to implement its own load and store methods.

      Looks like JBoss gives only one option of serializing the data. Seems wrong to have to implement a JBoss interface (PersistenceManager) to persist my data to a database instead.

      Also, I tried to extend RequiredModelMBean and specify a persistence manager in my jboss service xml file but I keep getting the following exception:

      org.jboss.deployment.DeploymentException: - nested throwable: (java.lang.NullPointerException)
      at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:143)
      at org.jboss.system.ServiceController.install(ServiceController.java:225)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
      at $Proxy5.install(Unknown Source)
      at org.jboss.deployment.SARDeployer.create(SARDeployer.java:183)
      at org.jboss.deployment.MainDeployer.create(MainDeployer.java:784)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:639)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:613)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
      at $Proxy7.deploy(Unknown Source)
      at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:302)
      at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:476)
      at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:200)
      at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:273)
      at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:966)
      at $Proxy0.start(Unknown Source)
      at org.jboss.system.ServiceController.start(ServiceController.java:392)
      at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
      at $Proxy5.start(Unknown Source)
      at org.jboss.deployment.SARDeployer.start(SARDeployer.java:226)
      at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:640)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:613)
      at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:597)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
      at $Proxy6.deploy(Unknown Source)
      at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:365)
      at org.jboss.system.server.ServerImpl.start(ServerImpl.java:272)
      at org.jboss.Main.boot(Main.java:150)
      at org.jboss.Main$1.run(Main.java:388)
      at java.lang.Thread.run(Thread.java:534)
      Caused by: java.lang.NullPointerException
      at org.jboss.mx.modelmbean.ModelMBeanInvoker.preRegister(ModelMBeanInvoker.java:243)
      at javax.management.modelmbean.RequiredModelMBean.preRegister(RequiredModelMBean.java:218)
      at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:148)
      at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
      at org.jboss.mx.interceptor.ObjectReferenceInterceptor.invoke(ObjectReferenceInterceptor.java:59)
      at org.jboss.mx.interceptor.MBeanAttributeInterceptor.invoke(MBeanAttributeInterceptor.java:43)
      at org.jboss.mx.interceptor.PersistenceInterceptor2.invoke(PersistenceInterceptor2.java:93)
      at org.jboss.mx.server.MBeanInvoker.invoke(MBeanInvoker.java:75)
      at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:141)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
      at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:994)
      at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:954)
      at org.jboss.mx.server.MBeanServerImpl.createMBean(MBeanServerImpl.java:322)
      at org.jboss.system.ServiceCreator.install(ServiceCreator.java:85)
      at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:155)
      at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:118)

      No matter what i do my MBean's ModelMBeanInfoSupport object is always null. I specified everything in my xmbean xml descriptor file. Not sure what is wrong. The DTDs pretty much say everything is optional but sounds like that isn't the case. Any ideas?

      Thanks for any help!

      Mike