BiteSizedChunks.comLearn one small thing at a time.

Course contentsShow

Java

774The Throwable Class: Root of All Exceptions and Errors
775Error vs Exception: Two Branches of Throwable
776When to Catch Error: Almost Never
777Exception as the Base for Application Problems
778Throwable Methods: getMessage, printStackTrace, and getCause
779Chained Exceptions and initCause
780getStackTrace and Stack Trace Elements
781Suppressed Exceptions in Throwable
782VirtualMachineError and LinkageError: System-Level Errors
783The Two Categories: Checked and Unchecked Exceptions
784What Makes an Exception Checked?
785What Makes an Exception Unchecked?
786The throws Clause: Declaring Checked Exceptions
787Compile-Time Enforcement of Checked Exceptions
788Why Unchecked Exceptions Don't Require Declaration
789When to Use Checked Exceptions: Recoverable Conditions
790When to Use Unchecked Exceptions: Programming Errors
791The Controversy: Checked Exceptions Debate
792Overriding Methods and Exception Compatibility
793Understanding RuntimeException and Unchecked Exceptions
794NullPointerException: The Most Common Runtime Error
795ArrayIndexOutOfBoundsException and Bounds Checking
796IndexOutOfBoundsException in Collections
797IllegalArgumentException: Validating Method Parameters
798IllegalStateException: Detecting Invalid Object States
799ClassCastException and Type Safety
800NumberFormatException: String to Number Conversion Failures
801ArithmeticException: Division by Zero and Integer Overflow
802UnsupportedOperationException in Collections
803When to Use RuntimeException vs Checked Exceptions
804Introduction to Checked Exceptions
805IOException: File and Stream Operations
806SQLException: Database Access Errors
807ClassNotFoundException and NoClassDefFoundError
808InterruptedException: Thread Interruption
809ParseException: Data Parsing Failures
810CloneNotSupportedException: Cloning Restrictions
811ReflectiveOperationException Hierarchy
812Choosing Between Checked and Unchecked
813When to Create Custom Exceptions
814Extending Exception for Checked Exceptions
815Extending RuntimeException for Unchecked Exceptions
816Constructors: Message, Cause, and Both
817Adding Custom Fields and Methods
818Exception Naming Conventions
819Exception Hierarchies for Related Errors
820Overriding getMessage for Custom Formatting
821Best Practices: Avoiding Exception Overuse

Java

774The Throwable Class: Root of All Exceptions and Errors
775Error vs Exception: Two Branches of Throwable
776When to Catch Error: Almost Never
777Exception as the Base for Application Problems
778Throwable Methods: getMessage, printStackTrace, and getCause
779Chained Exceptions and initCause
780getStackTrace and Stack Trace Elements
781Suppressed Exceptions in Throwable
782VirtualMachineError and LinkageError: System-Level Errors
783The Two Categories: Checked and Unchecked Exceptions
784What Makes an Exception Checked?
785What Makes an Exception Unchecked?
786The throws Clause: Declaring Checked Exceptions
787Compile-Time Enforcement of Checked Exceptions
788Why Unchecked Exceptions Don't Require Declaration
789When to Use Checked Exceptions: Recoverable Conditions
790When to Use Unchecked Exceptions: Programming Errors
791The Controversy: Checked Exceptions Debate
792Overriding Methods and Exception Compatibility
793Understanding RuntimeException and Unchecked Exceptions
794NullPointerException: The Most Common Runtime Error
795ArrayIndexOutOfBoundsException and Bounds Checking
796IndexOutOfBoundsException in Collections
797IllegalArgumentException: Validating Method Parameters
798IllegalStateException: Detecting Invalid Object States
799ClassCastException and Type Safety
800NumberFormatException: String to Number Conversion Failures
801ArithmeticException: Division by Zero and Integer Overflow
802UnsupportedOperationException in Collections
803When to Use RuntimeException vs Checked Exceptions
804Introduction to Checked Exceptions
805IOException: File and Stream Operations
806SQLException: Database Access Errors
807ClassNotFoundException and NoClassDefFoundError
808InterruptedException: Thread Interruption
809ParseException: Data Parsing Failures
810CloneNotSupportedException: Cloning Restrictions
811ReflectiveOperationException Hierarchy
812Choosing Between Checked and Unchecked
813When to Create Custom Exceptions
814Extending Exception for Checked Exceptions
815Extending RuntimeException for Unchecked Exceptions
816Constructors: Message, Cause, and Both
817Adding Custom Fields and Methods
818Exception Naming Conventions
819Exception Hierarchies for Related Errors
820Overriding getMessage for Custom Formatting
821Best Practices: Avoiding Exception Overuse

← Java

Lesson 794 of 2,870·19. Exception Hierarchy and Custom ExceptionsPro lesson

NullPointerException: The Most Common Runtime Error

Understand when NullPointerException occurs and strategies to prevent it in your code.

This lesson is for subscribers

You've completed the free preview. Subscribe to unlock every lesson in every course.

See pricing Back to course