How to Use IWorkspaceFactoryLockControl in Java

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I have tried to convert the interface but failed.

IWorkspaceFactory2 pWorkspaceFactory; pWorkspaceFactory = new CadWorkspaceFactory(); ipWsFactoryLock = (IWorkspaceFactoryLockControl)pWorkspaceFactory; It's failed when I use java. I also tried the way to use the keyword NEW like this:

IWorkspaceFactory2 pWorkspaceFactory; pWorkspaceFactory = new CadWorkspaceFactory(); ipWsFactoryLock = new IWorkspaceFactoryLockControlProxy(pWorkspaceFactory); And I failed again.How can I use this method to release FeatureClass in Java



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