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Fix getPresence ConcurrentModificationException

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Fix for SMACK-841

Since Smack 4.2.4, the getPresencesInternal method in the Roster class
can return a LruCache object, which is a LinkedHashMap with access
order. This means that any access using get or getOrDefault will be a
modification of the Map. If you loop over the keySet of the Map and
there are more than one, the second call to get will throw a
ConcurrentModificationException!

Since the keys are only used here to obtain the corresponding
values, the simplest solution is to just loop over the values instead.
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spslinger 2018-10-11 12:29:32 +02:00 committed by GitHub
parent 1aa35bc957
commit 1e21ab763c
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1 changed files with 1 additions and 2 deletions
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smack-im/src/main/java/org/jivesoftware/smack/roster/Roster.java
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@ -951,8 +951,7 @@ public final class Roster extends Manager {
// This is used in case no available presence is found // This is used in case no available presence is found
Presence unavailable = null; Presence unavailable = null;
for (Resourcepart resource : userPresences.keySet()) { for (Presence p : userPresences.values()) {
Presence p = userPresences.get(resource);
if (!p.isAvailable()) { if (!p.isAvailable()) {
unavailable = p; unavailable = p;
continue; continue;