Exception in thread "main" java.lang.NullPointerException

Hello guys, i was searching for that error and I found this site, a found some similar threads but i couldnt solve this erros. please ckeck it :)
If you dont understand the meaning of some variables its because they are in my language with just latin letters! Thanks a lot!

Code java:

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import java.io.*;
class Employee11{
  private String Eponymia;
  private String AFM;
  private int Meres_Ergasias;
  private double Hmeromisthio;
  private float Yperories;
  private float Syntelestis_Kratiseon;
 
  Employee11(String onoma, String afm, int meres, double xrima_meras, float uper){
    Eponymia = onoma;
    AFM = afm;
    Meres_Ergasias = meres;
    Hmeromisthio = xrima_meras;
    Yperories = uper;
  }
 
  public static double[] Ypol_TelikouMisthou(Employee11 pinakas[]){
      double katharos[] = new double[3];
      double akatharistos=0;
      for(int z=0; z<pinakas.length; z++){
       akatharistos=pinakas[z].Meres_Ergasias*pinakas[z].Hmeromisthio+0.2*pinakas[z].Hmeromisthio*pinakas[z].Yperories;
       if(akatharistos<=15000){
         katharos[z] = akatharistos-akatharistos*0.17;
       } else if(akatharistos<18000){
         katharos[z] = akatharistos-akatharistos*0.20;
       } else if(akatharistos<25000){
         katharos[z] = akatharistos-akatharistos*0.25;
       } else if(akatharistos<40000){
         katharos[z] = akatharistos-akatharistos*0.35;
       } else {
         katharos[z] = akatharistos-akatharistos*0.45;
       }
      }
        return katharos;
 
  }
}
public class Employee1 {
  public static void main(String[] args) throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    Employee11 pinakas[] = new Employee11[3];
    for(int z=0; z<pinakas.length; z++){
      System.out.println("Parakalo pliktrologiste to onomateponumo sas");
      String onoma = br.readLine();
      System.out.println("Parakalo pliktrologiste to AFM sas");
      String afm = br.readLine();
      System.out.println("Parakalo pliktrologiste tis meres ergasias sas");
      int meres = Integer.parseInt(br.readLine());
      System.out.println("Parakalo pliktrologiste to hmeromisthio sas");
      double xrima_meras = Double.parseDouble(br.readLine());
      System.out.println("Parakalo pliktrologiste to suntelesti uperorias sas");
      float uper = Float.parseFloat(br.readLine());
      pinakas[z] = new Employee11(onoma, afm, meres, xrima_meras, uper);
      double kathara[] = new double[3];
      kathara = Employee11.Ypol_TelikouMisthou(pinakas);
      for(z=0; z<kathara.length; z++){
        System.out.println(kathara);
        System.out.println();
      }
    }
  }
}

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Quote:

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i couldnt solve this erros

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Please copy the full text of the error messages and paste it here.

Please edit your post and wrap your code with code tags not quote tags
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

here it is
Exception in thread "main" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Floa tingDecimal.java:1011)
at java.lang.Float.parseFloat(Float.java:452)
at Employee1.main(Employee1.java:53)
Java Result: 1

Quote:

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Exception in thread "main" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Floa tingDecimal.java:1011)
at java.lang.Float.parseFloat(Float.java:452)
at Employee1.main(Employee1.java:53)

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That is a different error than the one in the title for this thread.

On line 53 the parsefloat() method was called with bad data. Make sure to pass a valid String to the method or catch the exception using a try{} catch block