001 /*
002 * Copyright 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package java.lang;
027
028 /**
029 * Signals that an unexpected exception has occurred in a static initializer.
030 * An <code>ExceptionInInitializerError</code> is thrown to indicate that an
031 * exception occurred during evaluation of a static initializer or the
032 * initializer for a static variable.
033 *
034 * <p>As of release 1.4, this exception has been retrofitted to conform to
035 * the general purpose exception-chaining mechanism. The "saved throwable
036 * object" that may be provided at construction time and accessed via
037 * the {@link #getException()} method is now known as the <i>cause</i>,
038 * and may be accessed via the {@link Throwable#getCause()} method, as well
039 * as the aforementioned "legacy method."
040 *
041 * @author Frank Yellin
042 * @version 1.24, 05/05/07
043 * @since JDK1.1
044 */
045 public class ExceptionInInitializerError extends LinkageError {
046 /**
047 * Use serialVersionUID from JDK 1.1.X for interoperability
048 */
049 private static final long serialVersionUID = 1521711792217232256L;
050
051 /**
052 * This field holds the exception if the
053 * ExceptionInInitializerError(Throwable thrown) constructor was
054 * used to instantiate the object
055 *
056 * @serial
057 *
058 */
059 private Throwable exception;
060
061 /**
062 * Constructs an <code>ExceptionInInitializerError</code> with
063 * <code>null</code> as its detail message string and with no saved
064 * throwable object.
065 * A detail message is a String that describes this particular exception.
066 */
067 public ExceptionInInitializerError() {
068 initCause(null); // Disallow subsequent initCause
069 }
070
071 /**
072 * Constructs a new <code>ExceptionInInitializerError</code> class by
073 * saving a reference to the <code>Throwable</code> object thrown for
074 * later retrieval by the {@link #getException()} method. The detail
075 * message string is set to <code>null</code>.
076 *
077 * @param thrown The exception thrown
078 */
079 public ExceptionInInitializerError(Throwable thrown) {
080 initCause(null); // Disallow subsequent initCause
081 this .exception = thrown;
082 }
083
084 /**
085 * Constructs an ExceptionInInitializerError with the specified detail
086 * message string. A detail message is a String that describes this
087 * particular exception. The detail message string is saved for later
088 * retrieval by the {@link Throwable#getMessage()} method. There is no
089 * saved throwable object.
090 *
091 *
092 * @param s the detail message
093 */
094 public ExceptionInInitializerError(String s) {
095 super (s);
096 initCause(null); // Disallow subsequent initCause
097 }
098
099 /**
100 * Returns the exception that occurred during a static initialization that
101 * caused this error to be created.
102 *
103 * <p>This method predates the general-purpose exception chaining facility.
104 * The {@link Throwable#getCause()} method is now the preferred means of
105 * obtaining this information.
106 *
107 * @return the saved throwable object of this
108 * <code>ExceptionInInitializerError</code>, or <code>null</code>
109 * if this <code>ExceptionInInitializerError</code> has no saved
110 * throwable object.
111 */
112 public Throwable getException() {
113 return exception;
114 }
115
116 /**
117 * Returns the cause of this error (the exception that occurred
118 * during a static initialization that caused this error to be created).
119 *
120 * @return the cause of this error or <code>null</code> if the
121 * cause is nonexistent or unknown.
122 * @since 1.4
123 */
124 public Throwable getCause() {
125 return exception;
126 }
127 }
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