mercredi 11 mai 2016

NullPointerException - check null on class

How to know the Employees.class is null or not using Java Relection?

Example Class: Employees.class

Problem:

  • employees.getName();
  • value getName is Mikel
  • employees is null
  • if employess != null is TRUE.
  • this class already 'new Employees()'

Employees.Class

public class Employees{

private Long id;<br>
private String kodStuff;<br>
private String Name;<br>

//Getter and Setter<br>
}

Example Process Method:

public void check(){
    Employees employees = new Empoyees;
    employees.setName("Mikel");
    employees.setKodStuff("KL370");
    //employees not save yet
    Boolean empty = copyName(employees );
}

public boolean checkName(Employees employees){
    boolean notNull = false;
    if(employees !=null && StringUtils.isNotBlank(employees.getName())){ // this is line 11
        notNull = true;
    }
    return notNull;
}

Throws exception at line no '11':

java.lang.NullPointerException

How can i check null exception during process on line no.11?





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