1 /*
2 * Copyright 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.lang;
27
28 /**
29 * Signals that an unexpected exception has occurred in a static initializer.
30 * An <code>ExceptionInInitializerError</code> is thrown to indicate that an
31 * exception occurred during evaluation of a static initializer or the
32 * initializer for a static variable.
33 *
34 * <p>As of release 1.4, this exception has been retrofitted to conform to
35 * the general purpose exception-chaining mechanism. The "saved throwable
36 * object" that may be provided at construction time and accessed via
37 * the {@link #getException()} method is now known as the <i>cause</i>,
38 * and may be accessed via the {@link Throwable#getCause()} method, as well
39 * as the aforementioned "legacy method."
40 *
41 * @author Frank Yellin
42 * @since JDK1.1
43 */
44 public class ExceptionInInitializerError extends LinkageError {
45 /**
46 * Use serialVersionUID from JDK 1.1.X for interoperability
47 */
48 private static final long serialVersionUID = 1521711792217232256L;
49
50 /**
51 * This field holds the exception if the
52 * ExceptionInInitializerError(Throwable thrown) constructor was
53 * used to instantiate the object
54 *
55 * @serial
56 *
57 */
58 private Throwable exception;
59
60 /**
61 * Constructs an <code>ExceptionInInitializerError</code> with
62 * <code>null</code> as its detail message string and with no saved
63 * throwable object.
64 * A detail message is a String that describes this particular exception.
65 */
66 public ExceptionInInitializerError() {
67 initCause(null); // Disallow subsequent initCause
68 }
69
70 /**
71 * Constructs a new <code>ExceptionInInitializerError</code> class by
72 * saving a reference to the <code>Throwable</code> object thrown for
73 * later retrieval by the {@link #getException()} method. The detail
74 * message string is set to <code>null</code>.
75 *
76 * @param thrown The exception thrown
77 */
78 public ExceptionInInitializerError(Throwable thrown) {
79 initCause(null); // Disallow subsequent initCause
80 this.exception = thrown;
81 }
82
83 /**
84 * Constructs an ExceptionInInitializerError with the specified detail
85 * message string. A detail message is a String that describes this
86 * particular exception. The detail message string is saved for later
87 * retrieval by the {@link Throwable#getMessage()} method. There is no
88 * saved throwable object.
89 *
90 *
91 * @param s the detail message
92 */
93 public ExceptionInInitializerError(String s) {
94 super(s);
95 initCause(null); // Disallow subsequent initCause
96 }
97
98 /**
99 * Returns the exception that occurred during a static initialization that
100 * caused this error to be created.
101 *
102 * <p>This method predates the general-purpose exception chaining facility.
103 * The {@link Throwable#getCause()} method is now the preferred means of
104 * obtaining this information.
105 *
106 * @return the saved throwable object of this
107 * <code>ExceptionInInitializerError</code>, or <code>null</code>
108 * if this <code>ExceptionInInitializerError</code> has no saved
109 * throwable object.
110 */
111 public Throwable getException() {
112 return exception;
113 }
114
115 /**
116 * Returns the cause of this error (the exception that occurred
117 * during a static initialization that caused this error to be created).
118 *
119 * @return the cause of this error or <code>null</code> if the
120 * cause is nonexistent or unknown.
121 * @since 1.4
122 */
123 public Throwable getCause() {
124 return exception;
125 }
126 }
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