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The referenced issue states that it is only applicable to Android < 4.2 (testing confirms the problem on 4.1.2, but not on 4.2.2). A test was added for the version code, primarily as a finder's aid for a day when K-9 Mail no longer supports Android < 4.2 and the work-around can be removed. The referenced issue also states that it is only necessary to hold a reference to the first PrivateKey retrieved. (Testing indicates that the problem is avoided so long at least one reference is always maintained to a PrivateKey -- it doesn't actually need to be a continuous reference to the first PrivateKey.) From my understanding, a normal class loader never unloads a class, so the static reference can be safely kept privately in KeyChainKeyManager.