server/storage/hbase/src/main/java/org/apache/vysper/storage/hbase/roster/HBaseRosterManager.java [130:142]:
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    @Override
    protected Roster addNewRosterInternal(Entity jid) {
        return new MutableRoster();
    }

    @Override
    public void addContact(Entity jid, RosterItem rosterItem) throws RosterException {
        if (jid == null)
            throw new RosterException("jid not provided");
        if (rosterItem.getJid() == null)
            throw new RosterException("contact jid not provided");

        Entity contactJid = rosterItem.getJid().getBareJID();
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server/storage/jcr/src/main/java/org/apache/vysper/storage/jcr/roster/JcrRosterManager.java [152:166]:
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    @Override
    protected Roster addNewRosterInternal(Entity jid) {
        return new MutableRoster();
    }

    @Override
    public void addContact(Entity jid, RosterItem rosterItem) throws RosterException {
        if (jid == null)
            throw new RosterException("jid not provided");
        if (rosterItem.getJid() == null)
            throw new RosterException("contact jid not provided");

        // TODO think about concurrent updates

        Entity contactJid = rosterItem.getJid().getBareJID();
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