[jira] [Resolved] (GEODE-6759) Prevent pool destruction if it's still in use and fix NPE in function execution

["Juan José Ramos Cassella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GEODE-6759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Juan José Ramos Cassella resolved GEODE-6759.
---------------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.10.0

> Prevent pool destruction if it's still in use and fix NPE in function execution
> -------------------------------------------------------------------------------
>
>                 Key: GEODE-6759
>                 URL: https://issues.apache.org/jira/browse/GEODE-6759
>             Project: Geode
>          Issue Type: Bug
>          Components: client/server
>            Reporter: Juan José Ramos Cassella
>            Assignee: Juan José Ramos Cassella
>            Priority: Major
>              Labels: GeodeCommons
>             Fix For: 1.10.0
>
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> A {{NullPointerException}} can be thrown on client side if the application executes a function on a pool that has been destroyed.
> The following code reproduces the issue:
> {code:java}
> ClientCache clientCache = new ClientCacheFactory().create();
> PoolManager.createFactory().addLocator(InetAddress.getLocalHost().getHostName(), locator.getPort()).create("poolOne");
> Region region = clientCache.createClientRegionFactory(PROXY).setPoolName("poolOne").create("TestRegion");
> PoolManagerImpl.getPMI().unregister(PoolManager.find("poolOne"));
> FunctionService.onRegion(region).execute(testFunction).getResult();
> {code}
> The problem is that we don't verify whether the {{Pool}} is currently being used or not within the {{unregister}} method. The following should be done:
> # Don't allow the user to unregister the pool when at least one region is associated to it.
> # Throw a meaningful exception if the pool can't be found before executing the function.



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