Class HelpfulNullPointerExceptionExamples

java.lang.Object

net.jrodolfo.java_evolution.java14.HelpfulNullPointerExceptionExamples

public class HelpfulNullPointerExceptionExamples
extends Object

Demonstrates helpful NullPointerException messages, introduced in Java 14.

Before Java 14, a null pointer failure inside a chained expression often produced a generic message. Developers had to debug the expression to figure out which value was null.

Java 14 improved JVM diagnostics so the exception message can describe which part of a chained access was null. The feature does not prevent null values, but it makes failures easier to diagnose.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	HelpfulNullPointerExceptionExamples.Address	Address with a city value used by the null-pointer diagnostic example.
static class	HelpfulNullPointerExceptionExamples.Customer	Customer with an address reference used to trigger nested null access.

Constructor Summary

Constructors

Constructor	Description
HelpfulNullPointerExceptionExamples()

Method Summary

Modifier and Type	Method	Description
String	triggerHelpfulNullPointerException()	Intentionally dereferences a nested null value so tests can inspect the helpful exception message.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HelpfulNullPointerExceptionExamples

public HelpfulNullPointerExceptionExamples()

Method Details

triggerHelpfulNullPointerException

public String triggerHelpfulNullPointerException()

Intentionally dereferences a nested null value so tests can inspect the helpful exception message.

Returns:

never returns when the default sample data is used