server/core/src/main/java/org/apache/vysper/xmpp/modules/core/im/handler/PresenceSubscriptionHandler.java [236:251]:
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        RosterItem rosterItem;
        try {
            rosterItem = rosterManager.getContact(userBareJid, contactBareJid);
        } catch (RosterException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

        if (rosterItem == null)
            return;

        RosterSubscriptionMutator.Result result = RosterSubscriptionMutator.getInstance().remove(rosterItem, TO);

        if (result != OK) {
            // TODO
            return;
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server/core/src/main/java/org/apache/vysper/xmpp/modules/core/im/handler/PresenceSubscriptionHandler.java [290:305]:
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        RosterItem rosterItem;
        try {
            rosterItem = rosterManager.getContact(userBareJid, contactBareJid);
        } catch (RosterException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

        if (rosterItem == null)
            return;

        RosterSubscriptionMutator.Result result = RosterSubscriptionMutator.getInstance().remove(rosterItem, TO);

        if (result != OK) {
            // TODO
            return;
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