Java.Lang.NullPointerException Error
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What is Java.Lang.NullPointerException Error?
A NullPointerException occurs in Java when you try to access or modify an object or method on a reference that is null. In simple terms, you’re trying to use an object that hasn’t been initialized.
Common Causes:
- Calling a method on a null object
- Accessing a field of a null object
- Using array or collection elements that are null
Solution:
- Always check if an object is null before using it.
- Initialize objects before calling their methods or fields.
Example (Throws Error):
java
public class Example {
public static void main(String[] args) {
String text = null;
System.out.println(text.length()); // Throws
NullPointerException
}
}
Fixed Code:
java
public class Example {
public static void main(String[] args) {
String text = “Hello World”;
System.out.println(text.length()); // Output: 11
}
}
Extra Tip:
You can use .Objects.requireNonNull()
to check for nulls early:
java
Objects.requireNonNull(text, “Text must not be null”);
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