源附件不包含文件JSON.class的源

Question

This there anything wrong with my code? I'm new to Java and i'm trying to import a file into MongoDB. However there is a error that i have no idea what is it. I am using Eclipse.

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.util.JSON;
import com.mongodb.util.JSONParseException;



public class readwrite {


    public static void main(String[] args) throws FileNotFoundException,IOException,JSONParseException{

        Mongo mongo = new Mongo("localhost", 27017);
        DB db = mongo.getDB("actualdata");
        DBCollection collection = db.getCollection("metadata");

        String line = null;
        StringBuilder sb = new StringBuilder();

        try {
            FileInputStream fstream = null;
            try {
                fstream = new FileInputStream("/home/Output/json1-100000-all");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                System.out.println("File does not exist, exiting");
                return;
            }

            BufferedReader bufferedReader = 
                new BufferedReader(new InputStreamReader(fstream));

            while((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
                DBObject dbObject;
                sb.append(dbObject = (DBObject) JSON.parse(bufferedReader.readLine()));
                collection.insert(dbObject);

                DBCursor cursorDoc = collection.find();
                while (cursorDoc.hasNext()) {
                    System.out.println(cursorDoc.next());
                }
            }       

            bufferedReader.close();         
        }
        catch(FileNotFoundException ex) {
            System.out.println("Unable to open file");              
        }
        catch(IOException ex) {
            System.out.println(
                "Error reading file");                  
            }
    }


}

This is the error that is displayed

[
Exception in thread "main" com.mongodb.util.JSONParseException: 
{
 ^
    at com.mongodb.util.JSONParser.read(JSON.java:272)
    at com.mongodb.util.JSONParser.parseObject(JSON.java:230)
    at com.mongodb.util.JSONParser.parse(JSON.java:195)
    at com.mongodb.util.JSONParser.parse(JSON.java:145)
    at com.mongodb.util.JSON.parse(JSON.java:81)
    at com.mongodb.util.JSON.parse(JSON.java:66)
    at readwrite.main(readwrite.java:45)

It show me this error when i clicked on at com.mongodb.util.JSONParser.read(JSON.java:272) where it says that the Source is not found. The source attachment does not contain the source for the file JSON.class. I can print the output of BufferedReader if i did not included the conversion of DBObject. Thanks in advance!

Answer 1

1) Didn't you mean to write JSON.parse(line) instead of JSON.parse(bufferedReader.readLine())) ? This might cause it to try and parse 'null' at the last iteration

2) If that doesn't help, could you get the exact string value of 'line' on the failed iteration? (this should be easy using debugger or simple printing to system out)

Regards