Trying to learn new language when you already know another one is most at times easier to do. And it is much more so easy when the new language you want to pick up is very related to the one you already know in one way or the other. Both Java and Python are great
java.lang.NullPointerException exception is one of the most popular errors in Java and it is caused by so many issues. One of such issues is when an objected is initiated to a Null value and then its reference is used to call a method or a variable. Example is in the code below.
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/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package checkingnullpointers; /** * * @author adaba */ public class CheckingNullPointers { //define some fields private String field1 = null; private String field2 = null; public String getField1(){ return field1; } public void setField1(String field1){ this.field1 = field1; } public String getField2(){ return field2; } public void setField2(String field2){ this.field2 = field2 ; } /** * method to greet * */ public void greet(){ System.out.println("Hello World"); } /** * @param args the command line arguments */ public static void main(String[] args) { try{ // TODO code application logic here CheckingNullPointers chk = new CheckingNullPointers(); //CheckingNullPointers chk = null; //chk.greet(); //initialise field1 chk.setField1("field1Value"); //do something chk = doSomething(); //initialize field2 chk.setField2("field2Value"); }catch(Throwable any){ System.out.println("Java Error" + any); any.printStackTrace(); } } // do something private static CheckingNullPointers doSomething(){ return null; } } // the |
In the
I was installing Talend and I realised that Talend installation requires Java 1.7 or below but not any Java version above that. (as at the time of writing) The installation quit straight away, giving a notification that it requires Java 1.7 These are the steps I followed to get Talend installation to succeed. First I
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