001: /*
002: * @(#)ExceptionInInitializerError.java 1.19 06/10/13
003: *
004: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006: *
007: * This program is free software; you can redistribute it and/or
008: * modify it under the terms of the GNU General Public License version
009: * 2 only, as published by the Free Software Foundation.
010: *
011: * This program is distributed in the hope that it will be useful, but
012: * WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * General Public License version 2 for more details (a copy is
015: * included at /legal/license.txt).
016: *
017: * You should have received a copy of the GNU General Public License
018: * version 2 along with this work; if not, write to the Free Software
019: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020: * 02110-1301 USA
021: *
022: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023: * Clara, CA 95054 or visit www.sun.com if you need additional
024: * information or have any questions.
025: *
026: */
027:
028: package java.lang;
029:
030: /**
031: * Signals that an unexpected exception has occurred in a static initializer.
032: * An <code>ExceptionInInitializerError</code> is thrown to indicate that an
033: * exception occurred during evaluation of a static initializer or the
034: * initializer for a static variable.
035: *
036: * <p>As of release 1.4, this exception has been retrofitted to conform to
037: * the general purpose exception-chaining mechanism. The "saved throwable
038: * object" that may be provided at construction time and accessed via
039: * the {@link #getException()} method is now known as the <i>cause</i>,
040: * and may be accessed via the {@link Throwable#getCause()} method, as well
041: * as the aforementioned "legacy method."
042: *
043: * @version 1.11, 02/02/00
044: *
045: * @since JDK1.1
046: */
047: public class ExceptionInInitializerError extends LinkageError {
048: /**
049: * Use serialVersionUID from JDK 1.1.X for interoperability
050: */
051: private static final long serialVersionUID = 1521711792217232256L;
052:
053: /**
054: * This field holds the exception if the
055: * ExceptionInInitializerError(Throwable thrown) constructor was
056: * used to instantiate the object
057: *
058: * @serial
059: *
060: */
061: private Throwable exception;
062:
063: /**
064: * Constructs an <code>ExceptionInInitializerError</code> with
065: * <code>null</code> as its detail message string and with no saved
066: * throwable object.
067: * A detail message is a String that describes this particular exception.
068: */
069: public ExceptionInInitializerError() {
070: initCause(null); // Disallow subsequent initCause
071: }
072:
073: /**
074: * Constructs a new <code>ExceptionInInitializerError</code> class by
075: * saving a reference to the <code>Throwable</code> object thrown for
076: * later retrieval by the {@link #getException()} method. The detail
077: * message string is set to <code>null</code>.
078: *
079: * @param thrown The exception thrown
080: */
081: public ExceptionInInitializerError(Throwable thrown) {
082: initCause(null); // Disallow subsequent initCause
083: this .exception = thrown;
084: }
085:
086: /**
087: * Constructs an ExceptionInInitializerError with the specified detail
088: * message string. A detail message is a String that describes this
089: * particular exception. The detail message string is saved for later
090: * retrieval by the {@link Throwable#getMessage()} method. There is no
091: * saved throwable object.
092: *
093: *
094: * @param s the detail message
095: */
096: public ExceptionInInitializerError(String s) {
097: super (s);
098: initCause(null); // Disallow subsequent initCause
099: }
100:
101: /**
102: * Returns the exception that occurred during a static initialization that
103: * caused this error to be created.
104: *
105: * <p>This method predates the general-purpose exception chaining facility.
106: * The {@link Throwable#getCause()} method is now the preferred means of
107: * obtaining this information.
108: *
109: * @return the saved throwable object of this
110: * <code>ExceptionInInitializerError</code>, or <code>null</code>
111: * if this <code>ExceptionInInitializerError</code> has no saved
112: * throwable object.
113: */
114: public Throwable getException() {
115: return exception;
116: }
117:
118: /**
119: * Returns the cause of this error (the exception that occurred
120: * during a static initialization that caused this error to be created).
121: *
122: * @return the cause of this error or <code>null</code> if the
123: * cause is nonexistent or unknown.
124: * @since 1.4
125: */
126: public Throwable getCause() {
127: return exception;
128: }
129: }
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