Package java.lang

Class 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 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