Andy Wilkinson d62c26c971 Ensure that preinitialization has completed before run returns ... Previously, background preinitialization was started in response to an ApplicationEnvironmentPreparedEvent and would complete at an undetermined time later. This opened a window where SpringApplication run could return and background preinitialization could still be in progress. If, within this window, something attempted to configure the logging system, an IO failure could occur as logging on the background preinitialization thread would attempt to use resources that had been closed. This commit updates BackgroundPreinitializer so that it waits for preinitialization to have completed when it receives an application ready or application failed event. This prevents SpringApplication run from returning while preinitialization is still in progress, closing the window described above. With info level logging enabled it appears that background preinitialization consistently completes before the application ready event is published. As a result, waiting should have no adverse effect on performance in normal circumstances. With logging configured such that background preinitialization outputs a large volume of log messages (enabling trace logging for the root logger, for example), it will be slowed down sufficiently for waiting to be necessary. Closes gh-5669		2017-07-27 10:18:21 +01:00
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src	Ensure that preinitialization has completed before run returns	2017-07-27 10:18:21 +01:00
pom.xml	Next development version	2017-07-27 08:00:21 +00:00