java.lang
Class ClassNotFoundException

java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          java.lang.ClassNotFoundException

All Implemented Interfaces:

Serializable

public class ClassNotFoundException

extends Exception

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."

Since:

JDK1.0

Author:

unascribed

See Also:

Class.forName(java.lang.String), ClassLoader.findSystemClass(java.lang.String), ClassLoader.loadClass(java.lang.String, boolean), Serialized Form

Field Summary

private Throwable	ex This field holds the exception ex if the ClassNotFoundException(String s, Throwable ex) constructor was used to instantiate the object
private static long	serialVersionUID use serialVersionUID from JDK 1.1.X for interoperability

Fields inherited from class java.lang.Throwable

Constructor Summary

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

Throwable	getCause() Returns the 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

fillInStackTrace, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

use serialVersionUID from JDK 1.1.X for interoperability

See Also:

Constant Field Values

ex

private Throwable ex

This field holds the exception ex if the ClassNotFoundException(String s, Throwable ex) constructor was used to instantiate the object

Since:

1.2

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

Since:

1.2

Method Detail

getException

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

Since:

1.2

getCause

public Throwable getCause()

Returns the 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.

Since:

1.4