java.io.FileNotFoundException, The system cannot find the path specified (cvs file) java

Question

All seems to be in order, but somehow it isn't. Here is the code;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.List;

     String csvFilename = "src/example.csv"; 
            CSVReader csvReader = new CSVReader(new FileReader(csvFilename));
            String[] row = null;
            String total = "";
            while((row = csvReader.readNext()) != null) {

                for( int i = 0 ; i < 200 ; i++ ){  // no higher than num of columns to be found or error

                    String saveAway = row[i];
                    //tabl[saveInThisRow][i] = row[i];
                    tabl[saveInThisRow][i] = saveAway.replace('_', ' ');

                }
                saveInThisRow++;
                if(saveInThisRow == 50) { saveInThisRow = 0; break; }

            }
            //saveInThisRow = 0;
            // ctrl-i  = auto format

            csvReader.close();

The path is as far as I can tell correct (its in the src), maybe there is is something wrong with the csv instead? It worked nicely in Eclipse, but now in Intellij its broken... whats going on here?

This is the stack trace;

java.io.FileNotFoundException: src\example.csv (The system cannot find the path specified)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:93)
    at java.io.FileReader.<init>(FileReader.java:58)
    at net.klingt.example.LoadCsv.readCsv(LoadCsv.java:61)
    at net.klingt.example.ProcessingExample.draw(ProcessingExample.java:252)
    at processing.core.PApplet.handleDraw(PApplet.java:2386)
    at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:240)
    at processing.core.PApplet.run(PApplet.java:2256)
    at java.lang.Thread.run(Thread.java:745)

Now I have this;

 public void readCsv(   ) throws IOException, URISyntaxException { // throws IOException  ---  String[] args
        System.out.println(".............");
        System.out.println(System.getProperty("user.dir"));

        val = 20; // testing purposes
        String [][] tab  = new String [100][400];
        int saveInThisRow = 0;

        File file = new File(getClass().getResource("src/resources/GEMSTONES05.csv").toURI());
        String csvFilename = "src/resources/GEMSTONES05.csv";

        CSVReader csvReader = new CSVReader(new FileReader(csvFilename));
        String[] row = null;
        String total = "";
        while((row = csvReader.readNext()) != null) {

            for( int i = 0 ; i < 20 ; i++ ){  // no higher than num of columns to be found or error
                String saveAway = row[i];
                parent.println("CVS read  " + saveAway);
                //tabl[saveInThisRow][i] = row[i];
                tabl[saveInThisRow][i] = saveAway.replace('_', ' ');
            }
            saveInThisRow++;
            if(saveInThisRow == 20) { saveInThisRow = 0; break; }

        }

        csvReader.close();

        for( int i = 0 ; i < 300 ; i++){

        }

    }

I am a bit lost how & where to use "file", here is the stack trace

C:\Program Files (x86)\JetBrains\IntelliJ IDEA 14.0.3\jre\jre\bin
Exception in thread "Animation Thread" java.lang.NullPointerException
    at net.klingt.example.LoadCsv.readCsv(LoadCsv.java:41)
    at net.klingt.example.ProcessingExample.draw(ProcessingExample.java:253)
    at processing.core.PApplet.handleDraw(PApplet.java:2386)
    at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:240)
    at processing.core.PApplet.run(PApplet.java:2256)
    at java.lang.Thread.run(Thread.java:745)

I no longer have the file not found error, instead now its an null pointer exception....

Answer 1

try with this

File file = new File(getClass().getResource("/example.csv").toURI());

it gets the file from src folder of your project

and make sure that example.csv is present in src folder.

change you readCSV() method to the following..

public void readCsv(   ) throws IOException, URISyntaxException { // throws IOException  ---  String[] args
    System.out.println(".............");
    System.out.println(System.getProperty("user.dir"));

    val = 20; // testing purposes
    String [][] tab  = new String [100][400];
    int saveInThisRow = 0;

    File file = new File(getClass().getResource("/resources/GEMSTONES05.csv").toURI());
    //String csvFilename = "/resources/GEMSTONES05.csv";

    CSVReader csvReader = new CSVReader(new FileReader(file));
    String[] row = null;
    String total = "";
    while((row = csvReader.readNext()) != null) {

        for( int i = 0 ; i < 20 ; i++ ){  // no higher than num of columns to be found or error
            String saveAway = row[i];
            parent.println("CVS read  " + saveAway);
            //tabl[saveInThisRow][i] = row[i];
            tabl[saveInThisRow][i] = saveAway.replace('_', ' ');
        }
        saveInThisRow++;
        if(saveInThisRow == 20) { saveInThisRow = 0; break; }

    }

    csvReader.close();

    for( int i = 0 ; i < 300 ; i++){

    }

}

while getting the Resource, you don't have to write the src folder name.. Because at runtime, jvm will get the resources from src folder and look for the next path.

Answer 2

"src/example.csv" is a relative path, try absolute path, like c:/work/src/example.csv. FileNotFoundException means file can't be found, often happens when you misuse relative path. you can print System.getProperty("user.dir") to see current directory of the process, then use correct relative path.