1 /*
2 * Copyright (c) 1999, 2006, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang.reflect;
27
28 import jdk.internal.misc.SharedSecrets;
29
30 import java.io.IOException;
31 import java.io.ObjectInputStream;
32 import java.io.ObjectOutputStream;
33 import java.io.ObjectStreamField;
34
35 /**
36 * Thrown by a method invocation on a proxy instance if its invocation
37 * handler's {@link InvocationHandler#invoke invoke} method throws a
38 * checked exception (a {@code Throwable} that is not assignable
39 * to {@code RuntimeException} or {@code Error}) that
40 * is not assignable to any of the exception types declared in the
41 * {@code throws} clause of the method that was invoked on the
42 * proxy instance and dispatched to the invocation handler.
43 *
44 * <p>An {@code UndeclaredThrowableException} instance contains
45 * the undeclared checked exception that was thrown by the invocation
46 * handler, and it can be retrieved with the
47 * {@code getUndeclaredThrowable()} method.
48 * {@code UndeclaredThrowableException} extends
49 * {@code RuntimeException}, so it is an unchecked exception
50 * that wraps a checked exception.
51 *
52 * <p>As of release 1.4, this exception has been retrofitted to
53 * conform to the general purpose exception-chaining mechanism. The
54 * "undeclared checked exception that was thrown by the invocation
55 * handler" that may be provided at construction time and accessed via
56 * the {@link #getUndeclaredThrowable()} method is now known as the
57 * <i>cause</i>, and may be accessed via the {@link
58 * Throwable#getCause()} method, as well as the aforementioned "legacy
59 * method."
60 *
61 * @author Peter Jones
62 * @see InvocationHandler
63 * @since 1.3
64 */
65 public class UndeclaredThrowableException extends RuntimeException {
66 static final long serialVersionUID = 330127114055056639L;
67
68 /**
69 * Constructs an {@code UndeclaredThrowableException} with the
70 * specified {@code Throwable}.
71 *
72 * @param undeclaredThrowable the undeclared checked exception
73 * that was thrown
74 */
75 public UndeclaredThrowableException(Throwable undeclaredThrowable) {
76 super(null, undeclaredThrowable); // Disallow initCause
77 }
78
79 /**
80 * Constructs an {@code UndeclaredThrowableException} with the
81 * specified {@code Throwable} and a detail message.
82 *
83 * @param undeclaredThrowable the undeclared checked exception
84 * that was thrown
85 * @param s the detail message
86 */
87 public UndeclaredThrowableException(Throwable undeclaredThrowable,
88 String s)
89 {
90 super(s, undeclaredThrowable); // Disallow initCause
91 }
92
93 /**
94 * Returns the {@code Throwable} instance wrapped in this
95 * {@code UndeclaredThrowableException}, which may be {@code null}.
96 *
97 * <p>This method predates the general-purpose exception chaining facility.
98 * The {@link Throwable#getCause()} method is now the preferred means of
99 * obtaining this information.
100 *
101 * @return the undeclared checked exception that was thrown
102 */
103 public Throwable getUndeclaredThrowable() {
104 return super.getCause();
105 }
106
107 /**
108 * Serializable fields for UndeclaredThrowableException.
109 *
110 * @serialField undeclaredThrowable Throwable
111 */
112 private static final ObjectStreamField[] serialPersistentFields = {
113 new ObjectStreamField("undeclaredThrowable", Throwable.class)
114 };
115
116 /*
117 * Reconstitutes the UndeclaredThrowableException instance from a stream
118 * and initialize the cause properly when deserializing from an older
119 * version.
120 */
121 private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
122 ObjectInputStream.GetField fields = s.readFields();
123 Throwable exception = (Throwable) fields.get("undeclaredThrowable", null);
124 if (exception != null) {
125 SharedSecrets.getJavaLangAccess().setCause(this, exception);
126 }
127 }
128
129 /*
130 * To maintain compatibility with older implementation, write a serial
131 * "ex" field with the cause as the value.
132 */
133 private void writeObject(ObjectOutputStream out) throws IOException {
134 ObjectOutputStream.PutField fields = out.putFields();
135 fields.put("undeclaredThrowable", super.getCause());
136 out.writeFields();
137 }
138 }