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From "Kurt Stam (JIRA)" <juddi-...@ws.apache.org>
Subject [jira] Created: (JUDDI-103) Transient registry errors caused by jUDDI race condition
Date Thu, 21 Jun 2007 23:02:26 GMT
 Transient registry errors caused by jUDDI race condition
---------------------------------------------------------

                 Key: JUDDI-103
                 URL: https://issues.apache.org/jira/browse/JUDDI-103
             Project: jUDDI
          Issue Type: Bug
            Reporter: Kurt Stam
            Assignee: Steve Viens


There is a race condition in the jUDDI codebase which causes transient registry failures.

The symptom of the race condition is the following error message
  E_busy (10400) The request cannot be processed at the current time. The Registry is currently
unavailable.

The class containing the race condition is org.apache.juddi.registry.local.Registry

Every call to Registry.getRegistry() results in the recreation and initialisation of a global
variable (registry). As the assignment of the global variable is made *before* the initialisation
method is called there exists a window of opportunity whereby a caller can obtain a reference
to an uninitialised registry. The consequence of this is that calls to RegistryEngine.isAvailable()
can return false.

I'm not sure why the RegistryEngine is being recreated on every call but the current code
is unsafe (even if ignoring multiprocessor memory models). There should not be a global reference
to the registry if it is a requirement to recreate it on every invocation. If it is not a
requirement then the initialisation should really be occurring within a static block. 

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