Class ClassNotFoundException
java.lang
java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          java.lang.ClassNotFoundException
All Implemented Interfaces:
java.io.Serializable
public class ClassNotFoundException
extends Exception
Thrown when an application tries to load in a class through its string name using:

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
Version:
1.21, 11/17/05
Author:
unascribed
See Also:
Class.forName(java.lang.String), ClassLoader.findSystemClass(java.lang.String), ClassLoader.loadClass(java.lang.String, boolean)
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 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
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 cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).
Overrides:
Returns:
the cause of this exception.
Since:
1.4
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