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Thread: Java NullPointerException When Accessing Object Attributes

  1. #1
    Junior Member
    Join Date
    Sep 2021
    Thanked 2 Times in 2 Posts

    Default Java NullPointerException When Accessing Object Attributes

    I'm encountering a NullPointerException in my Java code when trying to access the attributes of an object. I've created an instance of a class and assigned values to its attributes, but I'm still getting this error. Here's a simplified version of my code:

    public class Student {
        String name;
        int age;
        public Student(String name, int age) {
            this.name = name;
            this.age = age;
    public class Main {
        public static void main(String[] args) {
            Student student = new Student("Alice", 20);
            System.out.println("Name: " + student.name);
            System.out.println("Age: " + student.age);
            // Some other code here

    Surprisingly, the NullPointerException occurs at the System.out.println() lines. I've confirmed that the student object is not null, and I've also verified that the name and age attributes have been assigned values in the constructor.

    What could be causing this error, and how can I fix it? Is there something else I should be looking out for when working with object attributes? Any assistance would be greatly appreciated. Thank you!

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,710 Times in 2,660 Posts

    Default Re: Java NullPointerException When Accessing Object Attributes

    The posted code works for me.

    Can you copy and paste here the full contents of the window from when the exception happens?
    If you don't understand my answer, don't ignore it, ask a question.

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