ClassNotFoundException.java

package java.lang;

public class ClassNotFoundException extends Exception {
  /**
   * 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 <code>ClassNotFoundException</code> with no detail message.
   */
  public ClassNotFoundException() { // NOPMD
    super((Throwable) null); // Disallow initCause
  }

  /**
   * Constructs a <code>ClassNotFoundException</code> with the specified detail message.
   *
   * @param string the detail message.
   */
  public ClassNotFoundException(final String string) {
    super(string, null); // Disallow initCause
  }

  /**
   * Constructs a <code>ClassNotFoundException</code> with the specified detail message and optional
   * exception that was raised while loading the class.
   *
   * @param string the detail message
   * @param ex the exception that was raised while loading the class
   * @since 1.2
   */
  public ClassNotFoundException(final String string, final Throwable ex) {
    super(string, null); // Disallow initCause
    this.ex = ex;
  }

  /**
   * Returns the exception that was raised if an error occurred while attempting to load the class.
   * Otherwise, returns <tt>null</tt>.
   *
   * <p>
   * This method predates the general-purpose exception chaining facility. The
   * {@link Throwable#getCause()} method is now the preferred means of obtaining this information.
   * </p>
   *
   * @return the <code>Exception</code> that was raised while loading a class
   * @since 1.2
   */
  public Throwable getException() {
    return this.ex;
  }

  /**
   * Returns the cause of this exception (the exception that was raised if an error occurred while
   * attempting to load the class; otherwise <tt>null</tt>).
   *
   * @return the cause of this exception.
   * @since 1.4
   */
  @Override
  public Throwable getCause() {
    return this.ex;
  }
}