Preview truncated at 256 rows while reading csv file in java

Question

I am trying to read the contents of a csv file having around 2000 columns and 7 rows. I am getting following error.

Exception in thread "main" java.lang.NumberFormatException: For input string: "Preview truncated at 256 rows"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at java.lang.Double.valueOf(Double.java:502)

Please find the code below

   import java.io.BufferedReader;
   import java.io.FileReader;
   import java.io.IOException;
   import java.util.ArrayList;

   import org.apache.commons.math3.analysis.function.Log;

    public class GoogleFailureGenerator{    
    private ArrayList<Long>hostID = new ArrayList<Long>();  
    private ArrayList<Double>MTBF = new ArrayList<Double>();
    private ArrayList<Double>MTTR = new ArrayList<Double>();
    private ArrayList<Double>SD_TBF = new ArrayList<Double>();
    private ArrayList<Double>Var_TBF = new ArrayList<Double>();
    private ArrayList<Double>SD_TTR = new ArrayList<Double>();
    private ArrayList<Double>Var_TTR = new ArrayList<Double>();

public void failInfo(){
    BufferedReader buffer;
    try {
            buffer = new BufferedReader(new FileReader("C://Data/Australia/Information_for_Cloudsim.csv"));                     
            buffer.readLine(); //Skips the first line of the file. 
            String currentstr;
            while((currentstr=buffer.readLine()) != null){
                String[] column = currentstr.split(",");
                //System.out.println("column[0] = " +column[0]);

                if(column.length>0){
                    //hostID.add(Long.parseLong(column[0]));
                    hostID.add(Double.valueOf(column[0]).longValue());
                    MTBF.add(Double.parseDouble(column[1]));
                    SD_TBF.add(Double.parseDouble(column[2]));
                    Var_TBF.add(Double.parseDouble(column[3]));
                    MTTR.add(Double.parseDouble(column[4]));
                    SD_TTR.add(Double.parseDouble(column[5]));
                    Var_TTR.add(Double.parseDouble(column[6]));
                }               

            }
        }
         catch (IOException e) {
            e.printStackTrace();
            System.out.println("The simulation has been terminated due to an IO error");
        }   
    }



public static void main(String args[]){ 

GoogleFailureGenerator failgen = new GoogleFailureGenerator();

failgen.failInfo();

}
}

Any help will be highly appreciable.

Thanks in advance.

Yogesh Sharma

Answer 1

It seems pretty clear that your CSV is NOT in the format that you think it is. Look at it using Excel or a plain text editor. You should find a cell somewhere that says

    Preview truncated at 256 rows

instead of a valid number.

The most likely explanation is that the CSV file was not downloaded properly.

Your need to figure out why it didn't download properly; ie why you have a "preview" rather than a complete CSV. Then remedy that.

---

Hint: it pays to read the error messages ... in context. The actually error message says:

java.lang.NumberFormatException: 
    For input string: "Preview truncated at 256 rows" 

Notice that it says Number Format Exception, and that it is telling you exactly which string it thinks is not a correctly formatted number; ie the stuff inside the double quotes!!