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Java Errors and Exception Types


Errors and Exception Types

The table below shows a list of common Error and Exception types in Java:

Error/Exception Description
ArithmeticError Occurs when a numeric calculation goes wrong
ArrayIndexOutOfBoundsException Occurs when trying to access an index number that does not exist in an array
ClassFormatError Occurs when a class file cannot be accessed
ClassNotFoundException Occurs when trying to access a class that does not exist
ConcurrentModificationException Occurs when an element is added or removed from iterables
FileNotFoundException Occurs when a file cannot be accessed
IncompatibleClassChangeError Occurs when there's been a change in a base class after a child class has already been initialized
InputMismatchException Occurs when entering wrong input (e.g. text in a numerical input)
InterruptedException Occurs when a Thread is interrupted while waiting/sleeping
InvalidClassException Occurs when the Serialization runtime observes a problem with a class
IOException Occurs when an input or output operation fails
NegativeArraySizeException Occurs when trying to create an array with negative size
NoClassDefFoundError Occurs when the class is not found at runtime
NoSuchFieldException Occurs when trying to access a class field/variable that does not exist
NoSuchMethodException Occurs when trying to access a class method that does not exist
NullPointerException Occurs when trying to access an object referece that is null
NumberFormatException Occurs when it is not possible to convert a specified string to a numeric type
RuntimeException Occurs when an exception occurs at runtime
StringIndexOutOfBoundsException Occurs when trying to access a character in a String that does not exist
TypeNotPresentException Occurs when a type cannot be found
IllegalArgumentException Occurs when when an illegal argument is passed to a method
IllegalStateException Occurs when when a method is called at an illegal time


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