[jboss-dev-forums] [Design the new POJO MicroContainer] - Nulling properties on uninstall

[scott.stark@jboss.org]

I just saw that on a failed installation, the mc is nulling out previously set properties as part of the uninstall process. I'm not expecting this so an NPE is resulting:


  | 40250 TRACE [AbstractKernelController] Uninstalling VFSDeploymentScanner from Create
  | 40250 TRACE [CreateDestroyLifecycleAction] No destroy method for AbstractKernelControllerContext at 3727c5{ metadata=AbstractBeanMetaData at 2f1e75{name=VFSDeploymentScanner bean=org.jboss.deployers.plugins.scanner.VFSDeploymentScannerImpl properties=[mainDeployer, URIList] constructor=null}name=VFSDeploymentScanner target=VFSDeploymentScannerImpl at 18baf36{} state=Configured depends=AbstractDependencyInfo at 19c4091{idependOn=[AbstractDependencyItem at 19ed7e{name=VFSDeploymentScanner dependsOn=MainDeployer whenRequired=Configured dependentState=Installed resolved=true}] unresolved=[AbstractDependencyItem at 19ed7e{name=VFSDeploymentScanner dependsOn=MainDeployer whenRequired=Configured dependentState=Installed resolved=true}]}}
  | 40250 TRACE [AbstractKernelController] Uninstalling VFSDeploymentScanner from Configured
  | 40250 TRACE [ConfigureAction] Ignored for org.jboss.joinpoint.plugins.BasicMethodJoinPoint at ecd92c
  | java.lang.NullPointerException
  | 	at org.jboss.deployers.plugins.scanner.VFSDeploymentScannerImpl.setMainDeployer(VFSDeploymentScannerImpl.java:109)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  | 	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  | 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  | 	at java.lang.reflect.Method.invoke(Unknown Source)
  | 

I guess there needs to be a convention for the injection state of properties vs the bean kernel state. In this particular case I was just obtaining another property from the injected bean so I could actually delegate that to the kernel, but consider the case of deployers registering with the MainDeployer on injection. If there is no explicit start lifecycle, and injection of the MainDeployer was used as a proxy for this, there would be no way to unregister on uninstall. I guess that just means injection cannot be used as a proxy for lifecycle callbacks.


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