/*
 * Copyright (c) 1996, 2000, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.lang;

/**
 * Signals that an unexpected exception has occurred in a static initializer.
 * An <code>ExceptionInInitializerError</code> is thrown to indicate that an
 * exception occurred during evaluation of a static initializer or the
 * initializer for a static variable.
 *
 * <p>As of release 1.4, this exception has been retrofitted to conform to
 * the general purpose exception-chaining mechanism. The "saved throwable
 * object" that may be provided at construction time and accessed via
 * the {@link #getException()} method is now known as the <i>cause</i>,
 * and may be accessed via the {@link Throwable#getCause()} method, as well
 * as the aforementioned "legacy method."
 *
 * @author Frank Yellin
 * @since JDK1.1
 */
public class ExceptionInInitializerError extends LinkageError {
 /**
 * Use serialVersionUID from JDK 1.1.X for interoperability
 */
 private static final long serialVersionUID = 1521711792217232256L;

 /**
 * This field holds the exception if the
 * ExceptionInInitializerError(Throwable thrown) constructor was
 * used to instantiate the object
 *
 * @serial
 *
 */
 private Throwable exception;

 /**
 * Constructs an <code>ExceptionInInitializerError</code> with
 * <code>null</code> as its detail message string and with no saved
 * throwable object.
 * A detail message is a String that describes this particular exception.
 */
 public ExceptionInInitializerError() {
 initCause(null); // Disallow subsequent initCause
 }

 /**
 * Constructs a new <code>ExceptionInInitializerError</code> class by
 * saving a reference to the <code>Throwable</code> object thrown for
 * later retrieval by the {@link #getException()} method. The detail
 * message string is set to <code>null</code>.
 *
 * @param thrown The exception thrown
 */
 public ExceptionInInitializerError(Throwable thrown) {
 initCause(null); // Disallow subsequent initCause
 this.exception = thrown;
 }

 /**
 * Constructs an ExceptionInInitializerError with the specified detail
 * message string. A detail message is a String that describes this
 * particular exception. The detail message string is saved for later
 * retrieval by the {@link Throwable#getMessage()} method. There is no
 * saved throwable object.
 *
 *
 * @param s the detail message
 */
 public ExceptionInInitializerError(String s) {
 super(s);
 initCause(null); // Disallow subsequent initCause
 }

 /**
 * Returns the exception that occurred during a static initialization that
 * caused this error to be created.
 *
 * <p>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 saved throwable object of this
 * <code>ExceptionInInitializerError</code>, or <code>null</code>
 * if this <code>ExceptionInInitializerError</code> has no saved
 * throwable object.
 */
 public Throwable getException() {
 return exception;
 }

 /**
 * Returns the cause of this error (the exception that occurred
 * during a static initialization that caused this error to be created).
 *
 * @return the cause of this error or <code>null</code> if the
 * cause is nonexistent or unknown.
 * @since 1.4
 */
 public Throwable getCause() {
 return exception;
 }
}