JDK-8019623 : Lack of synchronization in AppContext.getAppContext()
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AppContext.getAppContext() isn't thread safe, which might result in all kind of issues, especially when creating the main AppContext.
There is no regression test for this particular issue because it's hard to write one, however, a generic regression test, test/sun/awt/AppContext/MultiThread/MultiThreadTest.java, has been written to help our catch unexpected regressions in the future.