`SimpleSSLContext::get` can return null, and hence, every call site is decorated with

    sslContext = new SimpleSSLContext().get();
    if (sslContext == null) {
        throw new AssertionError("Unexpected null sslContext");
    }

Introduce a new `newSSLContext` static factory method that is guaranteed to return a non-null `SSLContext`, or throw an exception if it fails to do so. Note that `newSSLContext` can also safely be imported as a static method without much of a chance for a name conflict.