java.lang.ClassNotFoundException Maven / Gradle / Ivy
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* published by the Free Software Foundation. Oracle designates this
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package java.lang;
/**
* 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 {@link #getException()} method is
* now known as the cause, and may be accessed via the {@link
* Throwable#getCause()} method, as well as the aforementioned "legacy method."
*
* @author unascribed
* @see java.lang.Class#forName(java.lang.String)
* @see java.lang.ClassLoader#findSystemClass(java.lang.String)
* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
* @since JDK1.0
*/
public class ClassNotFoundException extends ReflectiveOperationException {
/**
* use serialVersionUID from JDK 1.1.X for interoperability
*/
private static final long serialVersionUID = 9176873029745254542L;
/**
* This field holds the exception ex if the
* ClassNotFoundException(String s, Throwable ex) constructor was
* used to instantiate the object
* @serial
* @since 1.2
*/
private Throwable ex;
/**
* Constructs a ClassNotFoundException with no detail message.
*/
public ClassNotFoundException() {
super((Throwable)null); // Disallow initCause
}
/**
* Constructs a ClassNotFoundException with the
* specified detail message.
*
* @param s the detail message.
*/
public ClassNotFoundException(String s) {
super(s, null); // Disallow initCause
}
/**
* Constructs a ClassNotFoundException with the
* specified detail message and optional exception that was
* raised while loading the class.
*
* @param s the detail message
* @param ex the exception that was raised while loading the class
* @since 1.2
*/
public ClassNotFoundException(String s, Throwable ex) {
super(s, null); // Disallow initCause
this.ex = ex;
}
/**
* 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 {@link Throwable#getCause()} method is now the preferred means of
* obtaining this information.
*
* @return the Exception that was raised while loading a class
* @since 1.2
*/
public Throwable getException() {
return ex;
}
/**
* Returns the cause of this exception (the exception that was raised
* if an error occurred while attempting to load the class; otherwise
* null).
*
* @return the cause of this exception.
* @since 1.4
*/
public Throwable getCause() {
return ex;
}
}