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javamongodbcasting
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StackPointer

Reputation: 529

Java : Parsing Long throws error

I am using MongoDb. I have a collection named 'counter'. I am trying to retrieve a value of the field 'seq', which is stored as double inside the MongoDb.

First the value of the 'seq' field is increment by 1, which works fine. If I end up printing the value of the seq just after converting it to the string it works fine. It returns a string value.

However when I try to parse the String value such as 1.0 to Long using the Long.parseLong() or Long.valueOf() function, it throws an error.

SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container java.lang.NumberFormatException: For input string: "47.0"

public long getNextSeq(){
        DBCollection coll = getCollection(getDb(DB_NAME), "counters");
        coll.update(new BasicDBObject().append("_id","blogId"), new BasicDBObject().append("$inc",new BasicDBObject("seq",1)));
        DBObject seqObj = coll.findOne();
        String seqStr = seqObj.get("seq").toString();
        long seq = Long.valueOf(seqStr);
        return seq;
}

So I would like to know why I can't convert that 47.0 to long, and what is the solution.

Note: seqObj.get("seq") would produce BSONObject. (MongoDb query)

Upvotes: 0

Views: 495

Answers (1)

Martin
Martin

Reputation: 5322

I usually do the following:

long l = ((Number) seqObj.get("seq")).longValue();

Upvotes: 1

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