NPE in UpdateThread when updating a configuration right after
ConfigurationAdmin service starts
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Key: FELIX-2813
URL: https://issues.apache.org/jira/browse/FELIX-2813
Project: Felix
Issue Type: Bug
Components: Configuration Admin
Reporter: Marcel Offermans
When you:
1) register as a configuration listener
2) wait for the ConfigurationAdmin service to start
3) upon start, immediately create a new configuration and update its properties
You (sometimes) get a NPE in the UpdateThread because there is a race condition
in the codebase:
a) ConfigurationManager.java:1818 will invoke getServiceReference() which uses
the service registration to get to the reference
b) ConfigurationManager.java:242 registers the service and assigns the
registration to 'configurationAdminRegistration'
First of all, the call to registerService in line 242 will already trigger
service listeners and trackers to invoke callbacks before this call returns, so
'configurationAdminRegistration' will still be null. Furthermore, there is no
synchronization, the member is not volatile, so we need to make sure this value
is really written before any configuration events are created under a) (now the
thread doing that is started way before the service is registered).
I will commit a test that shows the exception, but since it happens in a thread
I cannot "catch" it won't show up as a failed test.
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