java.lang

Class ClassNotFoundException

java.lang.Object

java.lang.Throwable

java.lang.Exception

java.lang.ReflectiveOperationException

java.lang.ClassNotFoundException

All Implemented Interfaces:

Serializable

public class ClassNotFoundException
extends ReflectiveOperationException

Thrown when an application tries to load in a class through its string name using:

• The forName method in class Class.
• The findSystemClass method in class ClassLoader .
• The loadClass method in class ClassLoader.

but no definition for the class with the specified name could be found.

As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "optional exception that was raised while loading the class" that may be provided at construction time and accessed via the getException() method is now known as the cause, and may be accessed via the Throwable.getCause() method, as well as the aforementioned "legacy method."

See Also:

Class.forName(java.lang.String), Serialized Form

Constructor Summary

Constructors

Constructor and Description
ClassNotFoundException() Constructs a ClassNotFoundException with no detail message.
ClassNotFoundException(String s) Constructs a ClassNotFoundException with the specified detail message.
ClassNotFoundException(String s, Throwable ex) Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

Method Summary

Modifier and Type	Method and Description
Throwable	getCause() Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).
Throwable	getException() Returns the exception that was raised if an error occurred while attempting to load the class.

Methods inherited from class java.lang.Throwable

addSuppressed, fillInStackTrace, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassNotFoundException

public ClassNotFoundException()

Constructs a ClassNotFoundException with no detail message.

ClassNotFoundException

public ClassNotFoundException(String s)

Constructs a ClassNotFoundException with the specified detail message.

Parameters:

s - the detail message.

ClassNotFoundException

public ClassNotFoundException(String s,
                              Throwable ex)

Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

Parameters:

s - the detail message

ex - the exception that was raised while loading the class

Method Detail

getCause

@Nullable
public Throwable getCause()

Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).

Overrides:

getCause in class Throwable

Returns:

the cause of this exception.

getException

@Nullable
public Throwable getException()

Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns null.

This method predates the general-purpose exception chaining facility. The Throwable.getCause() method is now the preferred means of obtaining this information.

Returns:

the Exception that was raised while loading a class