server/core/src/main/java/org/apache/vysper/xmpp/modules/core/im/handler/PresenceSubscriptionHandler.java [181:196]:
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        Entity contact = stanza.getFrom();
        Entity user = stanza.getTo();

        Entity userBareJid = user.getBareJID();
        Entity contactBareJid = contact.getBareJID();

        RosterItem rosterItem;
        try {
            rosterItem = rosterManager.getContact(userBareJid, contactBareJid);
        } catch (RosterException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

        if (rosterItem == null)
            return;
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server/core/src/main/java/org/apache/vysper/xmpp/modules/core/im/handler/PresenceSubscriptionHandler.java [284:299]:
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        Entity contact = stanza.getFrom();
        Entity user = stanza.getTo();

        Entity userBareJid = user.getBareJID();
        Entity contactBareJid = contact.getBareJID();

        RosterItem rosterItem;
        try {
            rosterItem = rosterManager.getContact(userBareJid, contactBareJid);
        } catch (RosterException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

        if (rosterItem == null)
            return;
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