Exception: java.lang.ClassNotFoundException

  • public exception 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 ClassNotFoundException.getException() method is now known as the cause, and may be accessed via the Throwable.getCause() method, as well as the aforementioned "legacy method."

Authors:
@author unascribed
See:
@see Class.forName(java.lang.String)
@see ClassLoader.findSystemClass(java.lang.String)
@see ClassLoader.loadClass(java.lang.String, boolean)
Since:
@since JDK1.0

Inheritance

Superclass tree: Implements:

Methods

  • ClassNotFoundExceptiontop

    public ClassNotFoundException()
    Constructs a ClassNotFoundException with no detail message.
    Related Links:
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  • ClassNotFoundExceptiontop

    public ClassNotFoundException(String s)
    Constructs a ClassNotFoundException with the specified detail message.
    Parameters:
    @param s the detail message.
    Related Links:
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  • ClassNotFoundExceptiontop

    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:
    @param s the detail message
    @param ex the exception that was raised while loading the class
    Since:
    @since 1.2
    Related Links:
    Google Code Search
    Stack Overflow

  • getCausetop

    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).
    Return:
    @return the cause of this exception.
    Since:
    @since 1.4
    Override hierarchy:
    getCause from Throwable
    Related Links:
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  • getExceptiontop

    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.

    Return:
    @return the Exception that was raised while loading a class
    Since:
    @since 1.2
    Related Links:
    Google Code Search
    Stack Overflow