private static com.mongodb.Mongo getMongo() throws Exception {
        if (mongo == null) {
            mongo = new MongoClient(host);
        }
        return mongo;
    }
private static com.mongodb.Mongo getMongo() throws Exception {
        if (mongo == null) {
            mongo = new MongoClient(host);
        }
        return mongo;
    }
private static com . mongodb . Mongo getMongo ( ) throws Exception { if ( mongo == null ) { mongo = new MongoClient ( host ) ; } return mongo ; }
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