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NullPointerException possible in DefaultSubscriptionRegistry [SPR-13204] #17796
#17482 introduced support for a selector header expression on SUBSCRIBE frames so that messages from the destination cache are further filtered based on that selector expression. During that additional filtering a NullPointerException is possible if unsubscribe takes place concurrently and the session subscription has been removed.
Affects: 4.2 RC1
Referenced from: commits 0b43e4e