Fix deadlock caused by concurrent class loading #639
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When loading generated data classes concurrently the ProGuard protection which calls Data.nullOf in a static initializer can result in a deadlock on the Data.NULL_CACHE lock. The fix is to emulate ConcurrentMap.computeIfAbsent to protect against blocking during concurrent populate of the cache.
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🤖 I have created a release \*beep\* \*boop\* --- ### [0.25.5](https://www.github.com/googleapis/google-auth-library-java/compare/v0.25.4...v0.25.5) (2021-04-22) ### Dependencies * update autovalue to 1.8.1 ([googleapis#638](https://www.github.com/googleapis/google-auth-library-java/issues/638)) ([62cd356](https://www.github.com/googleapis/google-auth-library-java/commit/62cd3564a93abe3cbbe083ac9b7aaebe4608b4bd)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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When loading generated data classes concurrently the ProGuard protection which calls Data.nullOf in a static initializer can result in a deadlock on the Data.NULL_CACHE lock. The fix is to emulate ConcurrentMap.computeIfAbsent to protect against blocking during concurrent populate of the cache.
Fixes #638